SpringMVC之参数传递

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对于页面的参数如何传递到后台，即参数的返回，看如下示例：

1、Springmvc 配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xmlns:p="http://www.springframework.org/schema/p"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <!--        使Spring支持自动检测组件，如注解的Controller    -->  <context:component-scan base-package="cn.com.yy.controller"/>    <!-- 开启注解配置 --><mvc:annotation-driven/>      <!-- 支持JSP JSTL的解析器 -->    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">    <property name="prefix" value="/WEB-INF/page/"/>    <property name="suffix" value=".jsp"/>     </bean></beans>

2、Controller

package cn.com.yy.controller;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controller@RequestMapping("/data")public class ParameterTransferController {@RequestMapping("/addUser")public String add(String username,String password,HttpServletRequest request){request.setAttribute("username1", username);request.setAttribute("password1", password);return "view";}@RequestMapping("/jump")public String toPage(){return "add";}}

3、add.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">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><script type="text/javascript">function addUser(){var form = document.forms[0];form.action = "/TestSpringMVC3/data/addUser";form.method = "post";form.submit();}</script>  </head>    <body>  <form action="/data/addUser">  username:<input type="text" name="username"><br>  password:<input type="text" name="password"><br>  <input type="button" value="add user" onclick="addUser()">  </form>  </body></html>

4、view.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">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  username:${username1}<br>  username:${password1}  </body></html>

5、结果

（1）首先访问http://localhost:8080/TestSpringMVC3/data/jump，跳转到add.jsp页面

（2）在add.jsp中，输入内容，提交

（3）会跳转到view.jsp中

6、分析

（1）从页面到Controller参数传递

关键在于页面的参数命名和controller方法中的参数命名一致。

（2）从Controller到页面展示

就是Servlet参数传递。

将进一步优化，引入实体类：

package cn.com.yy.entity;public class User {private String username;private String password;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

在Controller中，使用如下方式：

@RequestMapping("/addUser2")public String add2(User user,HttpServletRequest request){request.setAttribute("username1", user.getUsername());request.setAttribute("password1", user.getPassword());return "view";}

此种方式同样可以完成参数的传递。

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