JSP Implicit Object's

<div dir="ltr" style="text-align: left;" trbidi="on"> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif";"><br /></span> <div class="separator" style="clear: both; text-align: center;"> <span style="font-family: "Georgia","serif";"><iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/1YkQjDQIrqg?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></span></div> <div style="text-align: center;"> <span style="font-family: "Georgia","serif";"><span style="line-height: 18.18181800842285px;"><br /></span></span></div> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">During the translation phase, the jsp engine declares and initializes nine commonly used variables in the service method of the generated servlet. They are implicitly made available to a jsp without need of declaring them. These are known as implicit variables or implicit objects. They are as follows.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Request<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Response<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Session<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Config<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Application<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Page<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Exception<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Out<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">pageContext<o:p></o:p></span></div> <div class="MsoNormal"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Request:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> This object is of type javax.Servlet.http.HttpServletREquest. It refers to the current request to the jsp. By using this object we can capture the client data. For example in a scriptlet we can write as follows.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            String name=request.getParameter(“html textbox name”);<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">%><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">With the above scriptlet we can get the form data directly into the jsp.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Response</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">:- This objet is of type javax.servlet.http.HttpServletResponse. It  is used for sending customized response to the client.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Session:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> This object is of type javax.servlet.http.HttpSession. This object is not available in a jsp if we  say <%@ page session=”false” %>. In a servlet when we available in a jsp it is imlicitly available. If we want to implement session tracking in a jsp, we make use of this object.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Config:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> The object is of type javax.servlet.ServletConfig. When initialization parameters are supplied to the jsp explicitly from the web.xml. we can retrieve them by using this object.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><% String paramvalue=config.getInitParameter(“Paramname”); %><o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Application:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> This is an object of type javax.servlet.ServletContext. It refers to the environment to which the jsp belongs. Using this object we can retrieve application level state. All the web components(Jsps & servlets) running in the same application can share common information. For example if a servlet or another jsp has stored some info in the ServletContext object, in our current jsp we can retrieve it as follows.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%  String value=(String)application.getAttribute(“name”); %><o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Page:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> The is an object of type java.lang.object. It refers to the instance of the generated servlet. This is very rarely used in a jsp.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Exception:-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> This object <o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <br /></div> <br /></div>

JSP Implicit Object's

During the translation phase, the jsp engine declares and initializes nine commonly used variables in the service method of the gener...

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JSP Page Directives

<div dir="ltr" style="text-align: left;" trbidi="on"> <div class="separator" style="clear: both; text-align: center;"> <iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/e4n9ZBjYU1E?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div> <br /> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">While expressions, scriptlets and declarations are used to define the logic to be executed at run-time(request processing time), directives are used to provide pages with information at translation time – when the jsp page is converted to a servlet.<o:p></o:p></span></div> <div class="MsoNormal"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Directives are used to specify the classes that are imported, to specify the error page used for catching exceptions, to import tag libraries and making them available to use on the page etc.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">JSP directives provide general information about the jsp page to the JSP engine.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">JSP directives do not generate code. They are not part of the logic within the JSP code. JSP directives provide directions and instructions to the container, telling it how to handle certain aspects of JSP specification. </span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">There are 3 types of directives according to jsp specification.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> </div> <ul style="text-align: left;"> <li><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">            Include directive</span></li> <li><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">            Taglib directive</span></li> <li><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">            Page directive</span></li> </ul> <br /> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">A JSP directive is of the form<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%@ directive attribute=value %><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Include Directive:-</b> An include directive telis the JSP engine to include the contents of another file inline (exactly at the location of directive usage) in the current jsp. Include file can be another jsp or a HTML file. Include directive is of the following form </span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%@ include file = “filename” %><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">The following example include the souce code of the header.jsp in the current.jsp<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><a href="mailto:%25@include%20file%20=%20%E2%80%9Cheader.jsp%E2%80%9D%25">%@include file = “header.jsp”%</a><o:p></o:p></span></div> <div class="MsoNormal"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">When the current jsp(the jsp in which this directive is used) receives the client request, the jsp enine reads the entire jsp before translation. Once include directive is encountered, the jsp engine copies the contents of the header.jsp into the current jsp inline. Then it translates the current jsp into a servlet. As this happens during the translation phase of the jsp, we say that directives are translation time instructions that are given to the jsp container(engine).<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Taglib directive:- This directive is used to tel the container which tg library a specific JSP requires. It is also used to assign a prefix gthat is used within the JSP page to identify tags from a specific tag library. Now jsp engine can locate the code for these tag libraries and get them ready for use by the JSP page. Taglib directive is of the form</span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> <%@ taglib prefix=”name” url=”values”%>(More on this in custom tags).<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Page Directive:</b>- This directive informs the engine about the overall properties of a jsp page. This directive applies to the entire translation unit and not just to the page in which it is declared. This directive is of the following form.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><<a href="mailto:%25@page%20attribute=%E2%80%9Dvalue%E2%80%9D%20attribute=%E2%80%9Dvalue%E2%80%9D.....%25">%@page attribute=”value” attribute=”value”.....%</a>><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Even though there are many attributes for the page directive, the most frequently used ones are discussed here.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Import:-</b> This attribute is similar to the import statement in a normal java source code. Once this attribute is used , the jsp container inserts an import statement into the generated servlet for each of the packages declared using this attribute. We can import multiple packages in a single tag by using a comma-separated list of package names. We can also use multiple tags for readability.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Ex:- <%@ page import=”java.io.*”%><o:p></o:p></span></div> <div class="MsoNormal"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Session:- </b> This attribute indicates to the jsp engine whether the current jsp takes part in a http session. The default value is true. If we don’t want the jsp to participate ina session, then we have to explicitly say<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%@page session = “false” %><o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>errorPage:</b>- we can handle the exceptions in a jsp by writing try and catch blocks. However, the jsp specification provides cleaner approach. This approach separates the error hadling code from the main code from the main page and thus promotes resability of exception handling mechanism. In this approach, a jsp uses the error page attribute of the page directive to delegate the exception to another JSP page that has the error handling code.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><<a href="mailto:%25@page%20errorPage=%E2%80%9Dhandler.jsp%E2%80%9D%25">%@page errorPage=”handler.jsp”%</a>><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>isErrorpage:-</b> This attribute conveys whether the current jsp can act as an error handler for any other jsp. By default this value is false. In the abouve example, when we write handler.jsp. In that file we must use the following statement.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%@page isErrorPage=”true”><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Content Type:-</b> This attribute specifies the MIME type of the output. The default values is text/html. </span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">If we want to change the MIME type we can say as follows.</span></div> <div class="MsoNormal"> <span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%@page contentType=”image/gif” %><o:p></o:p></span></div> <div class="MsoNormal"> <br /></div> </div>

JSP Page Directives

While expressions, scriptlets and declarations are used to define the logic to be executed at run-time(request processing time), direct...

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JSP Component Expression and Comments

<div dir="ltr" style="text-align: left;" trbidi="on"> <br /> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In previous post we are sharing Declaration some of important point I am coding here also please see my attached video also for better understanding. <o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In a declaration we can define (rarely) a static block and a class also<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In a Jsp we can have any number of declarations in any order.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Variables declared in a declaration are initialized to java default values.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Variables in a declaration retain their values across multiple requests because they are created <o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">And initialized only once.<o:p></o:p></span><br /> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span> <br /> <div class="separator" style="clear: both; text-align: center;"> <iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/IDTm18Hdafc?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div> <div style="text-align: center;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> </div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l0 level2 lfo1; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Expression:-</b> An expression scripting element is an embedded java expression that is evaluated and converted to a text string. The resulting text string is placed in a jsp output, in the location at which the element appears. Expressions act as placeholders for java anguage expressions. An expression is evaluated each time the page is accessed, and its value is then embedded in the output HTML. An expression has the following form.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            <%=any vaid java expression %><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Examples:</b><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b><br /></b></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%=a+b %><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%=new java.util.Date()%><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l2 level2 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Expressions are inserted into the service method of the container- generated servlet.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l2 level2 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">We can have any number of expressions per page.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l2 level2 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Embedded java expression should not be terminated with a semicolon.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l2 level2 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">We can print the value of any object or ay primitive data type to the output steam using </span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">an expression.</span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l2 level2 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">We can also use an expression in a jsp action attribute. In this case the value of the ex-</span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">Precision does not go to the output stream. It is evaluated at request time, and its value is assigned to the attribute. An Expression used in this way is known as request time attribute expression.</span><br /> <span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;"><br /></span> <br /> <div class="separator" style="clear: both; text-align: center;"> <iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/Cg8xWxilihs?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div> <span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-indent: .5in;"> <br /></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Scriptlet:-</b> A scriptlet is used to include complete fragments of java code in the body of the JSP page. This scripting element differs from the other two in 2ways.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> </div> <ul style="text-align: left;"> <li><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">            </span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">It is not limited to the declaration of methods and variables.</span></li> <li><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">            </span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">It does not generated a string output directly, as expressions do.</span></li> </ul> <br /> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">A scriptlet has the following form <% Any vakud free frin if hava cide %><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">For example,<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%  int sum=0;<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            For(int I=1;i<10;i++)<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Sum+=1;<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">%><o:p></o:p></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Scriptlet can be placed anywhere within the jsp body<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">We can place any number of scriptlets in a jsp.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Each scriptlet is inserted into the service method of the container – generated servlet in the given order.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">The scriptlet is executed each time the page is requested.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Courier New"; font-size: 12.0pt; line-height: 115%; mso-fareast-font-family: "Courier New";">o<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">   </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">As scriptlets contain any java code, they are typically used for embedding computing logic within a  jsp page.<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: 1.0in; mso-add-space: auto; mso-list: l1 level2 lfo3; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Comments in a JSP page</b><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In a jsp we can have 3 kinds of comments<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Java comments<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            HTML comments<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            JSP comments<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In a declaration or a scriplet we can have single line or multi line java comments. HTML comment is of the form <!—Any commenting text </span><span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-ascii-font-family: Georgia; mso-char-type: symbol; mso-hansi-font-family: Georgia; mso-symbol-font-family: Wingdings;">à</span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">A JSP comment is of the form <%-- Any commenting text --%><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Note:- A JSP comment is also known as a hidden comment as it is not displayed in the client.<o:p></o:p></span></div> </div>

JSP Component Expression and Comments

In previous post we are sharing Declaration some of important point I am coding here also please see my attached video also for better un...

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JSP Components And First JSP Page

<div dir="ltr" style="text-align: left;" trbidi="on"> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="height: 90px; margin-left: auto; margin-right: auto; text-align: center; width: 166px;"><tbody> <tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgy2fDuC40RqB5hx6BeJc-d5H-u4W0eR7t66jdTJQrOfcQk0rzN8Rc2mqNF5YAKZJ_49cgKdJ8d6F1t2ygSLszWXBQZH-IjBKJxpkm05q9ITAZeONGm84AbKZSRDJHsmxMiMG7M-kNdO2c/s1600/jspcomponents.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgy2fDuC40RqB5hx6BeJc-d5H-u4W0eR7t66jdTJQrOfcQk0rzN8Rc2mqNF5YAKZJ_49cgKdJ8d6F1t2ygSLszWXBQZH-IjBKJxpkm05q9ITAZeONGm84AbKZSRDJHsmxMiMG7M-kNdO2c/s1600/jspcomponents.jpg" /></a></td></tr> <tr><td class="tr-caption" style="text-align: center;">Image Source Google Images</td></tr> </tbody></table> <div style="text-align: center;"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                               This post describes the components of a jsp page. My last post I try to given introduction about jsp. This post some of the components I am introducing. And I never used any of the components also I created first Hello world JSP page for understanding. Later I can give each component based examples also. Please see simple video end of the post.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                A Jsp contains HTML content,jsp tags and java code. By using jsp tags either we can embed java code directly into the jsp page or we can invoke the functionality of java code running behind the scenes. Java code is required for a jsp to provide dynamism to the web page.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Jsp tags can be classified into the following 3 categories.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: .75in; mso-add-space: auto; mso-list: l1 level1 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">1.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">       </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Scripting  Elements<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: .75in; mso-add-space: auto; mso-list: l1 level1 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">2.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">      </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Directives<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l1 level1 lfo1; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">3.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">      </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Actions<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l1 level1 lfo1; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Scripting Elements:</b>- The basic functionality of scripting elements is to allow jsp authors to embed java code directly into the jsp. We can classify scripting elements as follows.<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoListParagraphCxSpFirst" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">1.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">       </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Declaration<o:p></o:p></span></div> <div class="MsoListParagraphCxSpMiddle" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">2.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">      </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Expression<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo2; text-indent: -.25in;"> <!--[if !supportLists]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">3.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">      </span></span><!--[endif]--><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Scriptlet<o:p></o:p></span></div> <div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo2; text-indent: -.25in;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><b>Declaration:-</b> A Jsp declaration lets us define methods or variables in jsp. These methods and variables become direct members of the container generated servlet class. We can define both instance and static members in a declaration. A declaration has the following form.<o:p></o:p></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%!<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            //Java Variable declarations and method definitions<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">%><o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">For example<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><%!<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Private int count=1;//instance variable definition<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Static int total;//static variable declaration<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Int getCount()//instance method definition<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            {<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                        Return count;<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            }<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Static int getTotal()<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            {<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                        Return total;<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            }<o:p></o:p></span></div> <div class="MsoNormal"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">%></span><br /> <br /> <div class="separator" style="clear: both; text-align: center;"> <iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/5mDIbYMCIfM?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div> <div style="text-align: center;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Please see for better understanding JSP API click the following link</span></div> <div style="text-align: center;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><a href="http://www.youtube.com/watch?v=PLPzCumtpyw">JSP API</a></span></div> <div style="text-align: center;"> <br /></div> <div style="text-align: center;"> <br /></div> <div style="text-align: center;"> </div> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"></span><br /> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><o:p></o:p></span></div> </div>

JSP Components And First JSP Page

Image Source Google Images                                This post describes the components of a jsp page. My last post I try to gi...

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Introduction to Java Server Pages

<div dir="ltr" style="text-align: left;" trbidi="on"> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1rjYig6YVkd0DqWN-sgJAe-trnzankrEQ1UMg7fpz2ivIHbq34cuStmAokMhrpTg7gQoOIv3Bzatj70nRFnDn5G7cxxAAypb_4dREJRRVmhUszNnagegZnxDsv_75xpalD2SdOI9ky-s/s1600/jspi.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1rjYig6YVkd0DqWN-sgJAe-trnzankrEQ1UMg7fpz2ivIHbq34cuStmAokMhrpTg7gQoOIv3Bzatj70nRFnDn5G7cxxAAypb_4dREJRRVmhUszNnagegZnxDsv_75xpalD2SdOI9ky-s/s1600/jspi.jpg" /></a></td></tr> <tr><td class="tr-caption" style="text-align: center;">Image Source Google Images</td></tr> </tbody></table> <div style="text-align: center;"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                       Hi every till now I am trying to give Servlet stuff now I am sharing some information related to presentation layer component. Why I am calling here jsp is component is any piece of code is re-usable then that code is nothing but a component. This post information totally dedicated to who don’t know the jsp, so if you know jsp just watch the following video and give suggestion based on that I can update my self .<o:p></o:p></span><br /> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                    JSP is another web technology from  Sun Microsystems besides Servlets. JSP is a simple but powerful technology used to generate dynamic web pages on the server side. Jsp’s are direct extension of java servlets and provide a way to separate content generation from content presentation. Important point about jsp’s is that they are hyst servlets that are created from a combination of HTML and java code. It means that they have the complete functionality of a normal servlet.<o:p></o:p></span><br /> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Disadvantages of Servlets<o:p></o:p></span></b><br /> <b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></b></div> <div class="MsoNormal" style="text-align: justify;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                      Servlets are poor in presenting the response to the client. Dynamic content generation code is mixed with presentation code. As a result development, maintenance and administrative problems arise. RAD (Rapid Application Development) is not promoted as web designing tools, cannot be used for web content.<o:p></o:p></span><br /> <div style="text-align: center;"> <span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div> </div> <div class="MsoNormal" style="text-align: justify;"> <br /></div> <div class="MsoNormal" style="text-align: justify;"> <br /> <div class="separator" style="clear: both; text-align: center;"> <iframe allowfullscreen="allowfullscreen" class="b-hbp-video b-uploaded" frameborder="0" height="266" id="BLOGGER-video-e0534e9f6a0ea64e-10451" mozallowfullscreen="mozallowfullscreen" src="https://www.blogger.com/video.g?token=AD6v5dyt0F7TiJp4nRxCXeeTLri0CrYEMrCcAKPFZi-7NgRL9_R3VtyhAi8pjxGnA7_cSFUf0533G-FXR0aKtOFCuSJiZl7zhKxZQydiFR1sSe0paJbYGTdDzpxiAE0oQszPQrTiD6nc&origin=javapracticalinfo.blogspot.com" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div> <span class="watch-page-link"><br /></span></div> <div class="MsoNormal" style="text-align: justify;"> <b><i><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                 </span></i></b><b><i><span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-ascii-font-family: Georgia; mso-char-type: symbol; mso-hansi-font-family: Georgia; mso-symbol-font-family: Wingdings;">à</span></i></b><b><i><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">My Next post on Life Cycle of Jsp<o:p></o:p></span></i></b></div> </div>

Introduction to Java Server Pages

Image Source Google Images                        Hi every till now I am trying to give Servlet stuff now I am sharing some informat...

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