JSP中Forward和Redirect之间的区别

来源：互联网发布：java实现md5加密算法编辑：程序博客网时间：2024/05/22 13:55

为了说明JSP中Forward和Redirect之间的区别，写了一个测试web工程

index.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>index</title></head><body><form action='search' method='post'>Key Word<input id='keyWord' name='keyWord' value=''/><input type="submit" value='Search'/></form></body></html>

result.jsp：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>result</title></head><body>Key Word:<%= request.getParameter("keyWord")%><br/>The key Word can not be null or have * within it.</body></html>

web.xml：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>JSP</display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>    <servlet>  <servlet-name>test</servlet-name>  <servlet-class>com.sean.test</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>test</servlet-name>  <url-pattern>/search/*</url-pattern>  </servlet-mapping></web-app>

test.java：

package com.sean;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 test extends HttpServlet {private static final long serialVersionUID = 1L;@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {String keyWord = req.getParameter("keyWord");if(keyWord == null || keyWord.equals("") || keyWord.contains("*")){req.getRequestDispatcher("result.jsp").forward(req, resp);}else{//use baidu to search the keywordresp.sendRedirect("http://www.baidu.com/s?wd=" + keyWord);}}     }

一，Forward

访问测试web工程主页，并在输入框中输入*