Spring MVC中 控制器 向 视图 传参（返回数据到页面）
2020-11-26 本文已影响0人
凡哥爱丽姐
1、方法一（ModelMap）
1.1、index.jsp和success.jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>Hello World!</h2>
<form action="/user2" method="post">
<input type="text" name="username"/>
<input type="submit" value="提交">
</form>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: Mr Wei
Date: 2020/*/*
Time: 15:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"%>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>欢迎回来</h1>
<h1> ModelMap测试 ---> 欢迎回来${username} </h1>
</body>
</html>
1.2、Controller类
package com.fan.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class Controller2 {
@RequestMapping("/user2")
public String test1(String username, ModelMap map){
System.out.println(username);
map.addAttribute("username",username);
return "success";
}
}
1.3、启动tomcat测试
测试图片1.png
测试图片2.png
2、方法二（ModelAndView，注意与第一种和第三种区分）
2.1、index.jsp和success.jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>Hello World!</h2>
<form action="/user2" method="post">
<input type="text" name="username"/>
<input type="submit" value="提交">
</form>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: Mr Wei
Date: 2020/*/*
Time: 15:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"%>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>欢迎回来</h1>
<h1> ModelMap测试 ---> 欢迎回来${username} </h1>
<h1> ModelAndView测试 ---> 欢迎回来${user} </h1>
</body>
</html>
2.2、Controller类
package com.fan.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class Controller2 {
@RequestMapping("/user2")
public ModelAndView test2(String username){
ModelAndView modelAndView=new ModelAndView();
modelAndView.addObject("user",username);
//跳转页面
modelAndView.setViewName("success");
return modelAndView;
}
}
2.3、启动tomcat测试
测试图片1.png
测试图片2.png
3、方法三（Model）
3.1、index.jsp和success.jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>Hello World!</h2>
<form action="/user2" method="post">
<input type="text" name="username"/>
<input type="submit" value="提交">
</form>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: Mr Wei
Date: 2020/*/*
Time: 15:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"%>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>欢迎回来</h1>
<h1> ModelMap测试 ---> 欢迎回来${username} </h1>
<h1> ModelAndView测试 ---> 欢迎回来${user} </h1>
<h1> Model测试 ---> 欢迎回来${u} </h1>
</body>
</html>
3.2、Controller类
package com.fan.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class Controller2 {
@RequestMapping("/user2")
public String test3(String username, Model model){
model.addAttribute("u",username);
return "success";
}
}
3.3、启动tomcat测试
测试图片1.png
测试图片2.png
4、方法四（HttpServletRequest）老方法
5、我们有时候往页面传数据时，通过EL表达式显示不出来，我们往往在每个jsp页面加上isELIgnored="false"，如下：
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"%>
其实我们可以通过在更改web.xml头部，如下所示，这样就达到全局设置的目的，从而不需要在每个jsp页面加上isELIgnored="false"
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
