Spring mvc 的跳转路径，redirec和forward方式的区别

最新推荐文章于 2022-06-10 21:00:41 发布

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本文展示了Spring MVC中如何使用redirect和forward进行页面跳转，并通过示例代码解释了它们之间的主要区别。在add方法中使用'redirect:list'实现客户端跳转，update方法中使用'forward:/user/list'实现服务器端跳转，delete方法中使用'redirect:../list'返回上一级并跳转到list页面。

package com.jxq.controller;

import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.jxq.model.User;

@Controller
@RequestMapping("/user")
public class UserController {

   private Map<String,User> users=new HashMap<String,User>();
   private Logger log=Logger.getLogger(this.getClass());

   public UserController() {
       // TODO Auto-generated constructor stub
       users.put("tom", new User("tom","123","汤姆","jxq@126.com"));
       users.put("jack", new User("jack","123","杰克","jack@126.com"));
       users.put("mary", new User("mary","123","玛丽","mary@126.com"));
       users.put("mike", new User("mike","123","麦克","mike@126.com"));
   }

   @RequestMapping("/list")
   public String list(Model model){
       model.addAttribute("users",users);
       return "user/list";
   }

   @RequestMapping(value="/add",method=RequestMethod.GET)
   public String add(Model model){

       User user=new User();
       model.addAttribute("user",user);
       return "user/add";
   }

   @RequestMapping(value="/add",method=RequestMethod.POST)
   public String add(User user,Model model){
       //System.out.println("xxxxxxxxxxxxxxxxxx........................"+user.getUsername() +"," +user.getNickname());
       log.info("user add:"+user.getUsername() +"," +user.getNickname());
       users.put(user.getUsername(),user);
       model.addAttribute("user",user);
       return "redirect:list"; //演示1：客户端跳转，add 与list action同级。
   }

   @RequestMapping(value="/update/{username}",method=RequestMethod.GET)
   public String update(@PathVariable String username,Model model){
       User user=users.get(username);
       model.addAttribute("user",user);
       return "user/update";
   }

   @RequestMapping(value="/update/{username}",method=RequestMethod.POST)
   public String update(User user,Model model){
       users.put(user.getUsername(), user);
       model.addAttribute("user",user);
       return "forward:/user/list"; //演示2：服务器端跳转，对应目的方法的action路径。因为update后多带了username一级路径,使用redirect的话，路径会有点问题。
   }

   @RequestMapping(value="/del/{username}",method=RequestMethod.GET)
   public String delete(@PathVariable String username,Model model){
       users.remove(username);
       return "redirect:../list"; //演示3：客户端跳转，当前action路径为del/**路径下的**，要访问list路径，需要..返回一级才能访问到list
   }

   @RequestMapping(value="/show/{username}",method=RequestMethod.GET)
   public String show(@PathVariable String username,Model model){
       System.out.println("asdfasdfasdfa........................"+username);
       log.info("username:" + username);
       User user=users.get(username);
       model.addAttribute("user",user);
       return "user/show";
   }
}