在View上显示Controller里的变量

使用Map

package com.xundh.controller;

import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorldController {

@RequestMapping("/hello")
public String helloWorld(Map<String,Object> map) {
      map.put("hello", "world");
return "hello";
     }
}

WEB-INF/Views/hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    

</head>

<body>
    ${hello}. <br>
</body>
</html>

使用Model类对象

HelloWorldController

package com.xundh.controller;


import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorldController {

     @RequestMapping("/hello")
     public String helloWorld(Model model) {
         model.addAttribute("hello", "hello value");
         return "hello";
     }
}

hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    

</head>

<body>
    ${hello}. <br>
</body>
</html>

如果是个复合类，如User类对象，页面上用 user得到该对象，用 {user.propertyName}得到其属性

从View向Controller传值

从控制器获取request参数

HelloWorldController.java

@Controller
public class HelloWorldController {
     @RequestMapping("/hello")
public String helloWorld(@RequestParam int id,Map<String,Object> map) {
          System.out.println("获取request参数:id="+id);
return "hello";
     }   
}

完整的写法是：

@RequestParam(value="name",required=false)

不写注解也可以使用。

对象类型传值

HelloWorldController.java

package com.xundh.controller;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorldController {

     @RequestMapping("/hello")
     public String helloWorld(User user) {
         System.out.println(user.getName());
         return "hello";
     }
}

WebRoot/index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>Welcome</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
</head>

<body>
<form name="form1" action="hello" method="post">
<input type="text" name="name"/>
<input type="submit" value="submit" />
</form>
</body>
</html>

hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    

</head>

<body>
    ${user.name}. <br>
</body>
</html>

Spring 学习笔记5—— SpringMVC的参数传递
点击提交后：

限定使用Post

@RequestMapping(value="/hello4",method=RequestMethod.POST)

限定编码
在web.xml里设置

<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter </filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf8</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>encodingFilter</filter-name >
<url-pattern>/*</url-pattern>
</filter-mapping>

秒客网

Spring 学习笔记5—— SpringMVC的参数传递