forward:hello 与 redirect:hello的区别

程序员文章站 2022-07-02 13:00:50

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对于某些Controller的处理方法，当返回值为String类型时，返回的结果中可能含有forward或redirect前缀；

如：

@Controller
@RequestMapping("/user")
public class UserController {
	@RequestMapping("/forward")
	public String replyWithForward(HttpServletRequest request, String userId){
		request.setAttribute("userid", userId);
		
		System.out.println("userId =" +userId);
		
		return "forward:hello";
	}
	
	@RequestMapping("/redirect")
	public String replyWithRedirect(HttpServletRequest request, String userId){
		request.setAttribute("userid", userId);
		
		System.out.println("userId = "+userId);
		
		return "redirect:hello";
	}
}

测试页面hello.jsp;

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
 	String userId = (String)request.getAttribute("userid");   
 	System.out.println("获取到的userId为："+userId);
%>
<!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>测试页面</title>
</head>
<body>
	hello, <%= userId %>;
</body>
</html>

当路径为 http://localhost:8080/crazysnailweb/user/forward?userId=123时，浏览器中的URL不会发生变化，且页面输出：

forward:hello 与 redirect:hello的区别

博客分类： Spring forwardredirect