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请求转发与请求重定向区别（实例）

2016-09-06 16:54 471 查看

JSP内置对象请求转发与请求重定向

请求重定向:客户端行为, response, send redirect0,从本质上讲等同于两次请求前一次的请求对象不会保存,地址栏的URL地址会改变

请求转发:服务器行为, request . getrequestdispatcher0. forward( req , resp):是一次请求,转发后请求对象会保存,地址栏的URL地址不会改变

提交数据jsp文件
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

<!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>Insert title here</title>
<link rel="stylesheet" type="text/css" href="css/NewFile.css">
</head>
<body>
<div class="fo">

<form action="user/loginServlet"  meth="get">
username<input type="text" name="login"><br>
password<input type="password" name="password"><br>

<input type="submit" value="提交">
</form>
</div>

</body>
</html>

处理请求文件
package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import user.userInfo;

/**
* Servlet implementation class loginServlet
*/
//@WebServlet("/user/loginServlet")
public class loginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public loginServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String  username=request.getParameter("login");
String  password=request.getParameter("password");
userInfo us=new userInfo();
us.setUsername(username);
us.setPassword(password);
if (username.equals("11")&&password.equals("22")) {
HttpSession session=request.getSession();
session.setAttribute("user", us);
response.sendRedirect("../main.jsp");   //测试重定向
//request.getRequestDispatcher("../main.jsp").forward(request, response); //测试转发
}
else {
response.sendRedirect("../index.jsp");
}
}

}

转发后的jsp文件
<%@page import="com.sun.xml.internal.txw2.Document"%>
<%@page import="java.io.PrintWriter"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
</head>
<body>
<h1>这是main.jsp</h1>
<%
String name=request.getParameter("login");
String pass=request.getParameter("password");
out.print(name);
out.print(pass);

%>
</body>
</html>

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标签： jsp请求转发-重定

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