菜鳥學習Spring——SpringMVC注解版前臺向后臺傳值的兩種方式 · 菜鳥學SSH

## 一、概述。在很多企業的開法中常常用到SpringMVC+Spring+Hibernate（mybatis）這樣的架構，SpringMVC相當于Struts是頁面到Contorller直接的交互的框架也是界面把信息傳輸到Contorller層的一種架構，通過這個架構可以讓我們把頁面和Contorller層解耦，使得開發人員的分工更加明確。 ## 二、代碼演示。 1、首先配置SpringMVC環境。 1.1導入jar。 ![](https://box.kancloud.cn/2016-02-22_56caddfc6d7a6.jpg) 值得注意的是紅色標記的commons-logging這個jar包一定得引入進去不然會報錯。 1.2、xml配置文件。 web.xml ~~~ <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>*.spring</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> ~~~ springMVC-servlet.xml ~~~ <?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.gaowei.controller" /> </beans> ~~~ 2、前臺界面代碼。 login.jsp ~~~ <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="login.spring" method="post"> username:<input type="text" name="username"> <br/> password:<input type="text" name="password"> <br/> <input type="submit" value="登錄"> </form> </body> </html> ~~~ No.jsp ~~~ <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> No! </body> </html> ~~~ Ok.jsp ~~~ <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> OK！ welcome:${username} </body> </html> ~~~ 3、Contorller層接收前臺的兩種方式。方式一：利用@RequestParam這個注解 ~~~ package com.gaowei.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @Controller public class Login { //方式一 @RequestMapping("/login") public String login(@RequestParam("username") String username, @RequestParam("password") String password,Model model){ if (username.equals(password)) { model.addAttribute("username", username); return "ok.jsp"; } else { return "no.jsp"; } } } ~~~ 方式二： ~~~ package com.gaowei.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @Controller public class Login { @RequestMapping("/login") public String login(String username,String password,Model model){ if (username.equals(password)) { model.addAttribute("username", username); return "ok.jsp"; } else { return "no.jsp"; } } } ~~~ 4、界面結果。第一種傳值方式： ![](https://box.kancloud.cn/2016-02-22_56caddfc811b9.jpg) ![](https://box.kancloud.cn/2016-02-22_56caddfc92e57.jpg) 第二種傳值方式： > ![](https://box.kancloud.cn/2016-02-22_56caddfca5bfd.jpg) ## 三、總結。這里體現出了SpringMVC傳值方式的多樣性滿足了開發人員的不同需求。第一種用來表單的提交。第二種用來界面間相互傳值，也為了方便開發人員利用AJAX。