request转发地址不变，response重定向地址改变

1.主页面，index.jsp

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <%
    
        //转发地址不变，重定向地址改变
        session.setAttribute("key", "Session");
    %>
    <a href="request.jsp?id=6&name=admin">请求</a>
    <a href="response.jsp?id=10&name=root">响应</a>
    <br>
    <!-- 获取session id -->
    <%=session.getId() %>
</body>
</html>

2.request.jsp

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <%
    String id=request.getParameter("id");
    String name=request.getParameter("name");
    
    out.println(id+"==="+name);
    System.out.print("request执行了");
    System.out.println("key");
    //请求转发,前后页面共享一个request,RequestDispatcher.forward()是在服务器端运行; 
    request.getRequestDispatcher("hello.jsp").forward(request, response);
    %>
    <br/>
    <!-- 获取session id -->
    <%=session.getId() %>
</body>
</html>

3.response.jsp

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
        
    <%
    String id=request.getParameter("id");
    String name=request.getParameter("name");
    System.out.println(id+"==="+name);
    System.out.println("key");
    //重定向,前后页面不是一个request
    response.sendRedirect("hello.jsp");
    %>
    <br/>
    <!-- 获取session id -->
    <%=session.getId() %>
</body>
</html>

4.欢迎页面，hello.jsp

<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h1>这是欢迎页面</h1>
    <%
        String id=request.getParameter("id");
        String name=request.getParameter("name");
        out.println("key");
        out.println(id+"==="+name);
    %>
    <br/>
    <!-- 获取session id -->
    <%=session.getId() %>
</body>
</html>

 

posted @ 2019-05-30 14:26  南山下的采药人  阅读(1121)  评论(0)  编辑  收藏  举报