Java Practical info : What is Deployment Descriptor?

What are Servlet Filters

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                      
Hello everyone I think everyone celebrate NEW YEAR and Every one
welcoming 2013. I hope this year give lot of joeys and what are dreams in your
mind comes into true. Now see current post is related to filters. My last post I
given some of the Servlet information. Please see all servlet related post
once.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                    A filter is a container managed object that is declarative
inserted within the request-response cycle of http client and http server. A
filter instances acts as an interceptor. It is a preprocessed of the request
befre it reaches a servlet and a post processor of the response leaving the
servlet. A filter can perform the following.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Intercept a servlet’s invocation before a
servlet is called.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Examine the request before a servlet is called.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Modify the request headers and request data.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Modify the response headers and response data.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Intercept a servlet’s invocation after the servlet
is called.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">               A filter object implements <i>javax.servlet.Filter.interface</i>. The interface provides 3 life cycle
methods.<o:p></o:p></span></div>
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<b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Public void
init(FilterConfig):-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> Servlet engine calls this method only once
after instantiating the filter. Initialization parameters are encapsulated in
the FilterConfig object. By calling getInitParameter method in the
FilterConfing object we can retrieve them. This method must complete successfully
before the filter is asked to day any filtering work.<o:p></o:p></span></div>
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<b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Public void
doFilter(ServletRequest,ServletResponse,FilterChain):-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> It is
called by the container each time a request/ response pair is passed through
the chain due to a client request for a resource at the end of the chain. The
FilterChain passed into this method allows the filter to pass on the request
and response to the next entity in the chain.<o:p></o:p></span></div>
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<b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Public void
destroy():-</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> Called by the servlet engine to indicate to a
filter that it is being taken out of service. This method gives the filter an
opportunity to clean up any resources that are being held. For example, closing
of the database connection.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            Hey common
you know my principle why you need to study all the mater right just watch the following
video you can understand better way what are the Servlet Filters, right then why late start the following
video. Once again HAPPY NEW YEAR 2013. <o:p></o:p></span><br />
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What are Servlet Filters

Image Source Google Images Hello everyone I think everyone celebrate NEW YEAR and Every one welcoming 2013....

Session Tracking

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                 This post is regarding Session
Tracking information previous post totally servlet related information and what
are the types of servlets your all seen right now what is the session Tracking
you can know much very easy way okay lest start.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                             Http is stateless protocol. A web client opens a
connection with the http server and requests some resource. The server responds
with the requested resource and closes the connection with client. After
closing the connection, the http server does not remember any information about
the client. The server considers the next request from the same client as a
fresh request, with no relation to the previous request. This is what the
stateless nature of the Http protocol.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                In enterprise web application it is mandatory that client
and its associated data must be tracked at server side across multiple
requests. There are four approaches to achieve this.<o:p></o:p></span></div>
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<span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">  </span></span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Hidden
form fields<o:p></o:p></span></div>
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<span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">  </span></span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Cookies<o:p></o:p></span></div>
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<span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">  </span></span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Session
tracking with Servlet API<o:p></o:p></span></div>
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<span style="font-family: Wingdings; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings;">v<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">  </span></span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">URL
rewriting<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Note: for Hidden form fields mechanism there is no servlet
API support available.<o:p></o:p></span></div>
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<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;">              <b><u> </u></b></span></span><b style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;"><u>Hidden
form fields:-</u></b><span style="font-family: Georgia, serif; font-size: small;"><span style="line-height: 115%;">a hidden field is similar to an ordinary input field in HTML. The
only difference is that the hidden field </span></span><span style="font-family: Georgia, serif;"><span style="line-height: 18.18181800842285px;">doesn't</span></span><span style="font-family: Georgia, serif; font-size: small;"><span style="line-height: 115%;"> have an associated user
interface element. When the form that contains these hidden form fields is
submitted, the values of these fields are sent with the request. On the server side,
these values are received as request parameters. This mechanism works only when
form is submitted, not when you click the hyperlink. The key point is that
client in this mechanism. That is how state is managed across multiple
requests. In J2EE environment this mechanism is not so widely used, as there is
no Servlet API support available.<o:p></o:p></span></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">         Hey
common I don’t want to give Para’s matter here. I can show you video’s for
better understand that why I am giving here let see why you are late.<o:p></o:p></span></div>
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Session Tracking

This post is regarding Session Tracking information previous post totally servlet related information ...

Servlet Error Handling

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                         Hi All
Everyone is enjoyed Christmas festival still some part of the world celebration
going up to New Year. Any have spent some valuable time to see my blog also for
this thanks lot. I am trying to give some information regarding Servlet
Exception Handling. In Every Application Development you must raise some un
excepted error may occurred. Sometimes you need to handle Exception for end
user point of you, so in order to use servlet you need to handle exception in
the following different ways. Any one of the technique you can implement some
times more than one technique also allows.  Now the time to see the different Techniques.<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">When a servlet throws an exception, the web
container searches the configurations in web.xml that use the <b>exception-type</b>
element for a match with the thrown exception type.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">You would have to use the error-page element in web.xml to specify the invocation
of servlets in response to certain exceptions or HTTP status codes.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Consider, you have an ErrorHandler servelt which would be called whenever there
is any defined exception or error. Following would be the entry created in <b>web</b>.xml.<o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><servlet><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">       
<servlet-name>ErrorHandler</servlet-name><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">       
<servlet-class>ErrorHandler</servlet-class><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"></servlet><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><servlet-mapping><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">       
<servlet-name>ErrorHandler</servlet-name><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">       
<url-pattern>/ErrorHandler</url-pattern><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"></servlet-mapping><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><error-page><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">   
<error-code>404</error-code><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">   
<location>/ErrorHandler</location><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"></error-page><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;"><error-page><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">   
<error-code>403</error-code><o:p></o:p></span></div>
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<span style="font-family: Georgia, serif; font-size: 12pt;">   
<location>/ErrorHandler</location><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"></error-page><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<br /></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"><error-page><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">    <exception-type><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">         
javax.servlet.ServletException<o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">    </exception-type ><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">   
<location>/ErrorHandler</location><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"></error-page><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<br /></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"><error-page><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">   
<exception-type>java.io.IOException</exception-type ><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;">   
<location>/ErrorHandler</location><o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: #f1f1f1; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt;">
<span style="font-family: Georgia, serif; font-size: 12pt;"></error-page><o:p></o:p></span></div>
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<br /></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: .75in; mso-add-space: auto; text-align: justify;">
<br /></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: .75in; mso-add-space: auto; mso-list: l1 level1 lfo1; text-align: justify; text-indent: -.25in;">
<span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">2.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">     
</span></span><span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">If you want to have a generic
Error Handler for all the exceptions then you should define following
error-page instead of defining separate <b>error-page</b>
elements for every exception:</span><o:p></o:p></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; text-align: justify;">
<br /></div>
<pre style="background: #F1F1F1;"><span style="font-family: Georgia, serif; font-size: 12pt;"><error-page><o:p></o:p></span></pre>
<pre style="background: #F1F1F1;"><span style="font-family: Georgia, serif; font-size: 12pt;">    <exception-type>java.lang.Throwable</exception-type ><o:p></o:p></span></pre>
<pre style="background: #F1F1F1;"><span style="font-family: Georgia, serif; font-size: 12pt;">    <location>/ErrorHandler</location><o:p></o:p></span></pre>
<pre style="background: #F1F1F1;"><span style="font-family: Georgia, serif; font-size: 12pt;"></error-page><o:p></o:p></span></pre>
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<br /></div>
<div class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;">
<span style="font-family: Georgia, serif; font-size: 12pt;">Following are the points to be
noted about above web.xml for Exception Handling:<o:p></o:p></span></div>
<ul type="disc">
<li class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;"><span style="font-family: "Georgia","serif"; font-size: 12.0pt; mso-bidi-font-family: "Courier New"; mso-fareast-font-family: "Times New Roman";">The servelt ErrorHandler is defined in
     usual way as any other servlet and configured in web.xml.<o:p></o:p></span></li>
<li class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;"><span style="font-family: "Georgia","serif"; font-size: 12.0pt; mso-bidi-font-family: "Courier New"; mso-fareast-font-family: "Times New Roman";">If there is any error with status code
     either 404 ( Not Found) or 403 ( Forbidden ), then ErrorHandler servlet
     would be called.<o:p></o:p></span></li>
<li class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;"><span style="font-family: "Georgia","serif"; font-size: 12.0pt; mso-bidi-font-family: "Courier New"; mso-fareast-font-family: "Times New Roman";">If the web application throws either ServletException or IOException,
     then the web container invokes the /ErrorHandler servlet.<o:p></o:p></span></li>
<li class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;"><span style="font-family: "Georgia","serif"; font-size: 12.0pt; mso-bidi-font-family: "Courier New"; mso-fareast-font-family: "Times New Roman";">You can define different Error
     Handlers to handle different type of errors or exceptions. Above example
     is very much generic and hope it serve the purpose to explain you the
     basic concept.<o:p></o:p></span></li>
</ul>
<div class="MsoListParagraph" style="background-color: white; background-position: initial initial; background-repeat: initial initial; margin-bottom: 0.0001pt; margin-left: 0.75in; text-indent: -0.25in;">
<span style="font-family: Georgia, serif; font-size: 12pt;">3.<span style="font-family: 'Times New Roman'; font-size: 7pt;">      </span></span><b><span style="font-family: Georgia, serif; font-size: 12pt;">Request Attributes - Errors/Exceptions</span></b><span style="font-family: Georgia, serif; font-size: 12pt;">:<o:p></o:p></span></div>
<div class="MsoNormal" style="background-color: white; background-position: initial initial; background-repeat: initial initial; text-align: justify;">
<span style="font-family: Georgia, serif; font-size: 12pt;">Following is the list of request
attributes that an error-handling servlet can access to analyses the nature of
error/exception.<o:p></o:p></span></div>
<div class="MsoNormal" style="text-align: justify;">
<span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">Hey common I am not forced to
read entire thing here you know my motive right I am stopping here to give much
please see the following video you can understand better way .<o:p></o:p></span><br />
<div style="text-align: center;">
<span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;"><br /></span></div>
</div>
<div class="MsoNormal" style="text-align: center;">
<br /></div>
<div class="MsoNormal" style="text-align: center;">
<div class="separator" style="clear: both; text-align: center;">
<iframe allowfullscreen="allowfullscreen" frameborder="0" height="266" mozallowfullscreen="mozallowfullscreen" src="https://www.youtube.com/embed/vvr9i6uCeyc?feature=player_embedded" webkitallowfullscreen="webkitallowfullscreen" width="320"></iframe></div>
<span style="font-family: Georgia, serif; font-size: 12pt; line-height: 115%;">        </span></div>
</div>

Servlet Error Handling

Hi All Everyone is enjoyed Christmas festival still some part of the world celebration going up ...

Inter Servlet Communication?

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                            </span></div>
<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/AVvXsEjZN9ODO-_GLCR8RXHzwvD1a7_cad-ldzn6swpSAKK80VkoMcYoF4VHZAXagwho0I2M-V051wCp8TpmZBcN7WebqLkzh7sG5cdUAP9YsQX9v6xjNBBvD81LEjDC_l_AgXl5HulJ2PkQ92E/s1600/ctree.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZN9ODO-_GLCR8RXHzwvD1a7_cad-ldzn6swpSAKK80VkoMcYoF4VHZAXagwho0I2M-V051wCp8TpmZBcN7WebqLkzh7sG5cdUAP9YsQX9v6xjNBBvD81LEjDC_l_AgXl5HulJ2PkQ92E/s1600/ctree.jpg" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Image Source  Google Images <b>Happy Christmas</b></td></tr>
</tbody></table>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                        Hi All my blog viewers Happy Christmas. To my post concentrating
on inter servlet communication.Before going to to how it works inter servlet
communication. Some of the important points you need to know.<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;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Servlet Context<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;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Request Dispatcher Object.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: .75in; mso-add-space: auto;">
<br /></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l2 level1 lfo2; text-indent: -.25in;">
<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><b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Servlet
Context</span></b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">: -  Servlet Engine
create ServletContext object as soon as the web application is deployed. This
object is only one per web application. All Servlets share this object.
ServletContext object is not directly available for servlets. To get its
reference we have to call the following method.  <o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="mso-list: l2 level1 lfo2; text-indent: -.25in;">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div>
<div class="MsoListParagraphCxSpMiddle">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                        ServletContext sc = getServletContext();<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle">
<br /></div>
<div class="MsoListParagraphCxSpMiddle">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Even though the above method is called on
the servlet instance, internally it is called on the ServletConfig object.
I.e., getServletContext method belongs to ServletConfig object.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle">
<br /></div>
<div class="MsoListParagraphCxSpMiddle">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">ServletContext object can be treated as
shared informatory repository for application level data. One servlet can store
data into this object and another servlet of the same application can
access  that data. A Servlet uses this
object for the following purposes.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle">
<br /></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: 63.0pt; mso-add-space: auto; mso-list: l4 level1 lfo3; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">To Communicate with the web container<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: 63.0pt; mso-add-space: auto; mso-list: l4 level1 lfo3; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">To talk to other servlets<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpMiddle" style="margin-left: 63.0pt; mso-add-space: auto; mso-list: l4 level1 lfo3; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">To Share data (in the form of attributes) with
other servlets<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: 63.0pt; mso-add-space: auto; mso-list: l4 level1 lfo3; text-indent: -.25in;">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%; mso-bidi-font-family: Georgia; mso-fareast-font-family: Georgia;">4.<span style="font-family: 'Times New Roman'; font-size: 7pt; line-height: normal;">     
</span></span><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">To get application level initialization
parameters known as context parameters.<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: 63.0pt; mso-add-space: auto; mso-list: l4 level1 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%;">Whenever a servlet wants to know the web container details
in which it is deployed, it can call getServletInfo method on the “sc”(ServletContext
object. To write any information into container log files we call log method on
“sc”. One servlet can store a data item into the ServletContext object by
calling setAttribute method. Another servlet can get it by calling getAttribute
method on the “sc” object.Whenever a servlet wants to communicate with the
other servlet, call getRequestDispatcher method on the “sc” object.It produces
RequestDispatcher object. Using RequestDispatcher object one servlet can
communicate with other servlets of the web application. Initialization
parameters are individual for each servlet. They are supplied from web.xml.
Aservlet retrieves them by ccalling getInitParameter() on the ServletConfig
object. When we want to supply common init parameters for all the servlets we
use context parameters.<o:p></o:p></span></div>
<div class="MsoNormal">
<br /></div>
<div class="MsoNormal">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><context-param><o:p></o:p></span></div>
<div class="MsoNormal">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            <param-name>any
name</param-name><o:p></o:p></span></div>
<div class="MsoNormal">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">            <param-value>anyvalue</param-value><o:p></o:p></span></div>
<div class="MsoNormal">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"></context-param><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">
<b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">RequestDispatcher
object: <o:p></o:p></span></b></div>
<div class="MsoNormal">
<b><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></b></div>
<div class="MsoNormal">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"> RequestDispatcher
object is used in the servlets to implement request dispatching. A Servlet
recives the client request, does the processing partially and hands over the
request processing duty to another servlet. This mechanism is known as request
dispatching. Inter servlet communication is implemented using RequestDispacher
object. In a servlet we can get RequestDispatcher object reference in two ways.<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 lfo4; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">RequestDispatcher rd =
context.getRequestDispatcher(String absolutepath);<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo4; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">RequestDispatcher
rd=request.getRequestDispatcher(String relativepath);<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l0 level1 lfo4; 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%;">If we are using the ServletContext object to get the
RequestDispatcher, we have to give absolute URL of the target resource. If we
are using HttpServletRequest to get the RequestDispatcher object, we give only
relative url of the target resource.Request dispatching can be implemented in
two ways.<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: l3 level1 lfo5; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Forward mechanism<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l3 level1 lfo5; text-indent: -.25in;">
<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Include mechanism<o:p></o:p></span></div>
<div class="MsoListParagraphCxSpLast" style="margin-left: .75in; mso-add-space: auto; mso-list: l3 level1 lfo5; text-indent: -.25in;">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div>
<div class="MsoNormal" style="margin-left: .5in;">
<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">You can see these functionality
and all the following video in better way.<o:p></o:p></span></div>
<div class="MsoNormal" style="margin-left: .5in;">
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">See my Next post how to handle
Servlet Exception…..<o:p></o:p></span></div>
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Inter Servlet Communication?

Image Source Google Images Happy Christmas Hi All my blog viewers Happy C...

HelloWorld Servlet Example

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                     </span><span style="font-size: 12pt; line-height: 115%;"><span style="font-family: Georgia, Times New Roman, serif;"> Hello Every one in this post 
I am trying to develop one simple HelloWorld servlet application. Here
also I am showing these steps through video. Please watch each step by step and
implement in your system I know you never forgot any single piece of step. Here
I am telling one there is lot of open source and books and many more available
I am not blamed any one there is different kind of approaches. I feel this is
one kind of approaches you may like or dislike. But one think I tell once I can
read any story it may lost after few days if you implement those reading
concepts or visualizing you never forgot right friends.<o:p></o:p></span></span></div>
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<span style="font-size: 12pt; line-height: 115%;"><span style="font-family: Georgia, Times New Roman, serif;">                        In
my previous post how many type of servlets available. What are the methods we
need to implement, what is the syntax kind of information you understand. Now
the time is understanding points implementation time right see the following
video and implement step by step. Hello friends one thing I can tell you better
to practice once after see this, if you feel its not understanding better to
see twice and implement after your confidence level defiantly increased.</span><span style="font-family: Georgia, serif;"><o:p></o:p></span></span></div>
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<a class="g-profile" href="http://plus.google.com/113781836164165339620" target="_blank">+Chandra Sekhar</a>          Next post we will much more details about servlets...............<br />
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HelloWorld Servlet Example

Hello Every one in this post I am trying to develop one simple HelloWorld servlet application. Here also I am sho...

Why we need Servlets?

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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                                  Hi All
viewers of my blog people I am not giving much more bored related to basic jee
concepts. Why because most of the blog reader these basic information
already  know but my focus on who are
switching into java technology  this
basic information is useful any have we are accepting my previous post also now
I am jump into servlets concepts. Here I am giving some of the question raised <o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Why we need Servlets?<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">What is the use of Servlets?<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">What is the life Cycle of Servlets?<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                           The above question
you know if know its not a problem jump into after the following video no
problem. But my basic thought is I am try to give as much information with
simple understandable way that the reason I am giving videos here. Please see
the following video you can clear the above question . if you see any kind of
movie we never forgotten right. If you read any kind story it may recollect or
not but movie not like that. I hope we are enjoyed this kind of interesting
learning practical java information.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">In the above video life cycle methods only defined. Two more
other methods also there<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">getServletConfig() and<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">getServletinfo()<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">1.getServletCofig(): Provides the ServletConfig object for
initializing the parameters of servlet<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">2.getServletInfo(): Used for extracting the Servlet Metadata
like<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Author,<o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Servlet version and <o:p></o:p></span></div>
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<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><span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Coptyright information<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;"><br /></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">Note: To know more about the servlet lifecycle methods refer
the API docs provided by SUN. Servlet documentation on Apache Software
Foundation  website also you can find.<o:p></o:p></span></div>
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<span style="font-family: "Georgia","serif"; font-size: 12.0pt; line-height: 115%;">                    My
Next post how to creating Servlet and all please see next post if you feel good
share this to your friends.<o:p></o:p></span></div>
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Why we need Servlets?

Hi All viewers of my blog people I am not giving much more bored related to basic jee concepts. Why bec...