Servlet LifeCycle Demo App
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This app contains Java servlet code to test the servlet lifecycle and a web.xml file to deploy the servlet. The servlet code prints messages at each stage of the lifecycle and displays request information. The web.xml maps the servlet to the URL pattern /lcurl. Forming a web module with these files and deploying it will allow enjoying testing the servlet lifecycle.
Servlet LifeCycle Demo App
- 1. This App contains the codes in two phases 1. LifeCycleTest Codes 2. web.xml codes note: form a web module and deploy these codes there and enjoy. Servlet Life-Cycle Test-App codes package com.nt; importjava.io.IOException; importjava.io.PrintWriter; importjava.util.Date; importjavax.servlet.ServletConfig; importjavax.servlet.ServletException; importjavax.servlet.ServletRequest; importjavax.servlet.ServletResponse; importjavax.servlet.annotation.WebServlet; importjavax.servlet.http.HttpServlet; /** * ServletimplementationclassLCTestSrv */ @WebServlet("/LCTestSrv") publicclassLCTestSrvextendsHttpServlet{ private staticfinal longserialVersionUID=1L; static{
- 2. System.out.println("ServletClassloading:staticblock"); } publicLCTestSrv() { System.out.println("ServletClassobjectcreation:0-paramconstructor"); } publicvoidinit(ServletConfigcfg){ System.out.println("ServletClassobjectinitialization:init(-) execution"); } publicvoidservice(ServletRequestreq,ServletResponseres) throwsServletException,IOException{ System.out.println("RequestProcessingevent:service(-,-)execution"); //general settings PrintWriterpw=res.getWriter(); res.setContentType("text/html"); //requestProcessinglogic pw.println(newDate()+"<br/><br/>"); //logicforobjectshashcode generation pw.println("<br><spanstyle=color:red>CurrentRequestHashcode:</span> "+req.hashCode()); pw.println("<br><spanstyle=color:red>CurrentResponse Hashcode:</span> "+req.hashCode()); pw.println("<br><spanstyle=color:red>CurrentThreadHashcode:</span> "+Thread.currentThread().hashCode()); pw.println("<br><spanstyle=color:red>ServletobjectHashcode:</span> "+this.hashCode()); try{Thread.sleep(5000);} catch(Exceptione){e.printStackTrace();} //close stream pw.close(); } publicvoiddestroy(){System.out.println("ServletContainorcalleddestroymethodjustbefore destroyingServletObject..");}
- 3. } web.xml codes <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>ServletLifeCycleDemoApp</display-name> <servlet> <servlet-name>lc</servlet-name> <servlet-class>com.nt.LCTestSrv</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>lc</servlet-name> <url-pattern>/lcurl</url-pattern> </servlet-mapping> </web-app>