@RequestMapping和RequestParam注解的使用

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1.在Web.xml中配置前端控制器DispatcherServlet

<?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">  <display-name>RequestMappingTest</display-name><!-- 定义Spring MVC的前端控制器 -->  <servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>        org.springframework.web.servlet.DispatcherServlet    </servlet-class>    <init-param>      <param-name>contextConfigLocation</param-name>      <param-value>/WEB-INF/springmvc-config.xml</param-value>    </init-param>    <load-on-startup>1</load-on-startup>  </servlet>  <!-- 让Spring MVC的前端控制器拦截所有请求 -->  <servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping>    <!-- 编码过滤器 -->  <filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param> </filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>

2.配置Spring MVC的Controller

springmvc-config.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:mvc="http://www.springframework.org/schema/mvc"    xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd        http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd             http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-4.2.xsd">            <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，    如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean -->    <context:component-scan base-package="org.fkit.controller"/>        <!-- 视图解析器  -->     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">         <!-- 前缀 -->        <property name="prefix">            <value>/WEB-INF/content/</value>        </property>        <!-- 后缀 -->        <property name="suffix">            <value>.jsp</value>        </property>    </bean></beans>

3.前端页面

loginForm.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>登录页面</title></head><body><h3>登录页面</h3><form action="login" method="post">     <table>         <tr>         <td><label>登录名: </label></td>             <td><input type="text" id="loginname" name="loginname" ></td>         </tr>         <tr>         <td><label>密码: </label></td>             <td><input type="password" id="password" name="password"></td>         </tr>         <tr>             <td><input id="submit" type="submit" value="登录"></td>         </tr>     </table></form></body></html>

registerForm.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>注册页面</title></head><body><h3>注册页面</h3><form action="register" method="post">     <table>         <tr>         <td><label>登录名: </label></td>             <td><input type="text" id="loginname" name="loginname" ></td>         </tr>         <tr>         <td><label>密码: </label></td>             <td><input type="password" id="password" name="password"></td>         </tr>         <tr>         <td><label>真实姓名: </label></td>             <td><input type="text" id="username" name="username" ></td>         </tr>         <tr>             <td><input id="submit" type="submit" value="注册"></td>         </tr>     </table></form></body></html>

welcome.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>测试@RequestMapping注解</title></head><body><!-- 页面可以访问Controller传递传递出来的模型User对象 -->欢迎[${requestScope.user.username }]登陆<br></body></html>

4.后端的实现

User.java

package org.fkit.domain;import java.io.Serializable;//域对象，实现序列化接口public class User implements Serializable {private String loginname;private String password;private String username;public User() {super();// TODO Auto-generated constructor stub}public String getLoginname() {return loginname;}public void setLoginname(String loginname) {this.loginname = loginname;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}}

UserController.java

package org.fkit.controller;import java.util.ArrayList;import java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.fkit.domain.User;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;//Controller注解用于指示该类是一个控制器，可以同时处理多个请求动作@Controller//RequestMapping可以用来注释一个控制器类，此时，所有方法都将映射为相对于类级别的请求, //表示该控制器处理所有的请求都被映射到 value属性所指示的路径下@RequestMapping(value="/user")public class UserController {// 静态List<User>集合，此处代替数据库用来保存注册的用户信息private static List<User> userList;// UserController类的构造器，初始化List<User>集合public UserController() {super();userList = new ArrayList<User>();// TODO Auto-generated constructor stub}// 静态的日志类LogFactory    private static final Log logger = LogFactory.getLog(UserController.class);        // 该方法映射的请求为http://localhost:8080/context/user/register，该方法支持GET请求    @RequestMapping(value="/register",method=RequestMethod.GET)    public String registerForm() { logger.info("register GET方法被调用..."); // 跳转到注册页面     return "registerForm"; }         // 该方法映射的请求为http://localhost:8080/RequestMappingTest/user/register，该方法支持POST请求  @RequestMapping(value="/register",method=RequestMethod.POST)  // 将请求中的loginname参数的值赋给loginname变量,password和username同样处理  public String register(@RequestParam("loginname") String loginname, @RequestParam("password") String password, @RequestParam("username") String username){ logger.info("register POST方法被调用...");    // 创建User对象    User user=new User();    user.setLoginname(loginname);    user.setPassword(password);    user.setUsername(username);    // 模拟数据库存储User信息    userList.add(user);    // 跳转到登录页面    return "loginForm"; }     // 该方法映射的请求为http://localhost:8080/RequestMappingTest/user/login    @RequestMapping("/login")    public String login(// 将请求中的loginname参数的值赋给loginname变量,password同样处理 @RequestParam("loginname") String loginname, @RequestParam("password") String password, Model model){    logger.info("登录名:"+loginname + " 密码:" + password);    // 到集合中查找用户是否存在，此处用来模拟数据库验证    for(User user :userList){    if(user.getLoginname().equals(loginname) && user.getPassword().equals(password)){    model.addAttribute("user",user);    return "welcome";    }    }    return "loginForm";    }}

截图：

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