Shulou(Shulou.com)06/02 Report--

This article shares with you the content of a sample analysis of the Servlet method implementation. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The Servlet method implements * development by implementing the servlet interface.

/ * * / / * @ (#) Hello.java * @ author shiyi05 * @ version 1.00 2008-5-9 * / / this is my * servlet, using implements Servlet to implement the servlet interface to develop package com.rao; import javax.servlet.*; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import java.io.IOException Import javax.servlet.*; import java.io.* Public class Hello implements Servlet. {public Hello (). {} / * / * Method init * @ param parm1 * @ throws ServletException * * / / this function is used to initialize the servlet This function will only be called once (when the user accesses the servlet *) public void init (ServletConfig parm1) throws ServletException. {/ / TODO: Add your code here System.out.println ("init") } / * / * Method getServletConfig * @ return * * / public ServletConfig getServletConfig (). {/ / TODO: Add your code here return null } / * / * Method service * @ param req is used to obtain the information of the client * @ param res is used to return information to the client * @ throws ServletException @ throws IOException * * / / this function is used to process the business logic every time the user accesses the servlet Will be called public void service (ServletRequest req, ServletResponse res) throws ServletException, IOException. {/ / TODO: Add your code here System.out.println ("service") PrintWriter pw=res.getWriter (); pw.println ("Hello world!");} / * * / * Method getServletInfo * @ return * * / public String getServletInfo (). {/ / TODO: Add your code here return "" } / * * / * Method destroy * / public void destroy (). {/ / TODO: Add your code here System.out.println ("destroy");}}

The Servlet method implements the second development by inheriting GenericServlet

/ * * / / * * @ (#) HelloGen.java * @ author shiyi05 * @ version 1.00 2008-5-9 * / / this is the second way to develop servlet by inheriting GenericServlet to develop package com.rao; import javax.servlet.GenericServlet; import java.io.*; import javax.servlet.* Public class HelloGen extends GenericServlet. {public HelloGen (). {} / / override the service () method public void service (ServletRequest req,ServletResponse res). {try... {PrintWriter pw=res.getWriter (); pw.println ("Hello World,Generic") } catch (Exception ex)... {ex.printStackTrace ();}

The third, and common, Servlet method is implemented by inheriting the HttpServlet class.

/ * * @ (#) HelloHttp.java * @ author shiyi05 * @ version 1.00 2008-5-9 * / / this is the third way to develop servlet, which implements package com.rao; import javax.servlet.http.*; import java.io.* by inheriting the HttpServlet class Public class HelloHttp extends HttpServlet... {public HelloHttp ()... {} / / processing Get requests public void doGet (HttpServletRequest req,HttpServletResponse res)... {try... {PrintWriter pw=res.getWriter (); pw.println ("Hello World,HttpServlet") } catch (Exception ex)... {ex.printStackTrace ();}} public void doPost (HttpServletRequest req,HttpServletResponse res)... {this.doGet (req,res);}}

* deploy these three servlet in web.xml file

< web-app xmlns= "http://java.sun.com/xml/ns/javaee" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version=" 2.5 " > < display-name > Welcome to Tomcat < / display-name > < description > Welcome to Tomcat < / description > < servlet >

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