Spring MVC之ModelAndView分析

前台表单

<form class="form-horizontal" role="form" action="user/login" method="post">账号：<input type="text" class="form-control" name="username" id="username">密码：<input type="password" class="form-control" name="userpwd" id="userpwd"><button type="submit" class="btn btn-default"> 登录</button></form>

controller

package com.music.controller;import java.util.HashMap;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.music.model.User;import com.music.service.UserService;@Controller@RequestMapping("/user")public class UserController {    @Autowired    private User user;    @Autowired    private UserService userService;    @RequestMapping("/login")   public ModelAndView login(String username,String userpwd,ModelAndView modelAndView) {    Map<String,Object> map=new HashMap<>();    map.put("username", username);    map.put("userpwd", userpwd);    User user=userService.selectByNameAndUserpwd(map);        if (user!=null) {        modelAndView.setViewName("success");字符串方式//视图在web-inf下面为success.jsp文件        modelAndView.addAllObjects(map);        return modelAndView ;    }    return modelAndView;}}

modelAndView.setViewName("/user/success");路径方式//视图在web-inf下的user文件夹下的success.jsp文件

 

 

mv.setViewName("redirect:/user/success.jsp");重定向方式//视图在web-inf下的user文件夹下的success.jsp

 

以上三种modelAndView.setViewName，都可以返回视图

如果想用ModelAndView返回，就public ModelAndView login（）{}这样写方法

modelAndView.setViewName("success");跟return “success”一样，由视图解析跳转到你配置的页面，一般是   /success.jsp  这个页面

第二种

controller中的写法

package com.music.controller;import java.util.HashMap;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.music.model.User;import com.music.service.UserService;@Controller@RequestMapping("/user")public class UserController {    @Autowired    private User user;    @Autowired    private UserService userService;    @RequestMapping("/login")   public String login(String username,String userpwd) {    Map<String,Object> map=new HashMap<>();    map.put("username", username);    map.put("userpwd", userpwd);    User user=userService.selectByNameAndUserpwd(map);    ModelAndView mv =new ModelAndView();    if (user!=null) {        mv.setViewName("success");        return mv.getViewName() ;    }    return mv.getViewName();}}

这是返回的不是ModelAndView型的，但是可以把ModelAndView   new出来，直接使用。

 

主要针对新手上手代码。