Spring 学习笔记5—— SpringMVC的参数传递

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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;@Controllerpublic 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;@Controllerpublic 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

@Controllerpublic 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;@Controllerpublic 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>

这里写图片描述
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>

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