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How to redirect web pages in jsp

一个新手Original: 2017-09-26 10:17:432090browse

Use the sendRedirect() method in the request object to redirect (webpage jump) to another page.

Format: request.sendRedirect("*.jsp");

With forwarding

Example: The user enters the login name and password on the login interface, and jumps to different pages if the input is correct or incorrect.

Code:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>        
    <title>My JSP &#39;login.jsp&#39; starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
<form action="receive.jsp" method="post">
姓名：<input type="text" name="rdname"><br>
密码：<input type="text" name="rdpasswd"><br>
    <input type="submit" value="确定">
</form>
  </body>
</html

receive.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>  
    <title>My JSP &#39;receive.jsp&#39; starting page</title>   
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <% String name=request.getParameter("rdname");
     String passwd=request.getParameter("rdpasswd");
     if(name.equals("abcd")&&passwd.equals("123456")){
   %>
   <jsp:forward page="correct.jsp"/>
   <%}else{%>
   <% response.sendRedirect("http://sohu.com");}%>
   
  </body>
</html>

correct.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>My JSP &#39;correct.jsp&#39; starting page</title>    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
  <% String name=request.getParameter("rdname"); %>
      欢迎，<%=name %>成功登陆！
  </body>
</html>

Running result (correct):

## Running result (error):

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