一个简单jsp-servlet例子

http://blog.csdn.net/liuluxyz/article/details/5739707


以下的简单jsp-servlet例子流程为:

index.jsp提交一个form表单,tomcat容器根据form中所定义的action从web.xml找到与之响应的servlet:Hello.java,根据form中定义的method找到servlet处理该请求的方法:doPost(),调用该方法做一定的逻辑处理之后,跳转到另一个页面:result.jsp;

 

 以下为源码:

Hello.java

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Hello extends HttpServlet {
    /**
     * Constructor of the object.
     */
    public Hello() {
       super();
   	   System.out.println("new Hello");
    }
    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
       super.destroy(); // Just puts "destroy" string in log
       // Put your code here
       System.out.println("destroy");
    }
    /**
     * The doGet method of the servlet. <br>
     * This method is called when a form has its tag value method equals to get.
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {    	
       String text1 = request.getParameter("text1");
    		String str = text1;
    		response.sendRedirect("result.jsp?text1=" + text1);   
}
    /**
     * The doPost method of the servlet. <br>
     * This method is called when a form has its tag value method equals to post.
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
           doGet(request,response);
    }
    /**
     * Initialization of the servlet. <br>
     * @throws ServletException if an error occure
     */
    public void init() throws ServletException {
       // Put your code here
    	System.out.println("init");
    }
}

index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>hello</title>
</head>
<body>
	<form action="myForm" method="post">
		<input type="text" name="text1" value="China">
		<input type="submit" value="submit  myForm">
	</form>
</body>
</html>

result.jsp


<%@ page language="java" pageEncoding="UTF-8"%>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>result</title>
</head>
<body>
	hello: <%= request.getParameter("text1") %>
</body>
</html>

web.xml


<?xml version="1.0" encoding="utf-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>Hello</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>/myForm</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>



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