1.在Web.xml中配置前端控制器DispatcherServlet
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- <?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>
- <!-- 定義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>
- <!-- 讓Spring MVC的前端控制器攔截所有請求 -->
- <servlet-mapping>
- <servlet-name>springmvc</servlet-name>
- <url-pattern>/</url-pattern>
- </servlet-mapping>
- <!-- 編碼過濾器 -->
- <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
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- <?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可以自動去掃描base-pack下面的包或者子包下面的java檔案,
- 如果掃描到有Spring的相關注解的類,則把這些類注冊為Spring的bean -->
- <context:component-scan base-package="org.fkit.controller"/>
- <!-- 視圖解析器 -->
- <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
- <!-- 字首 -->
- <property name="prefix">
- <value>/WEB-INF/content/</value>
- </property>
- <!-- 字尾 -->
- <property name="suffix">
- <value>.jsp</value>
- </property>
- </bean>
- </beans>
3.前端頁面
loginForm.jsp
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- <%@ 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>登入頁面</title>
- </head>
- <body>
- <h3>登入頁面</h3>
- <form action="login" method="post">
- <table>
- <tr>
- <td><label>登入名: </label></td>
- <td><input type="text" id="loginname" name="loginname" ></td>
- </tr>
- <tr>
- <td><label>密碼: </label></td>
- <td><input type="password" id="password" name="password"></td>
- </tr>
- <tr>
- <td><input id="submit" type="submit" value="登入"></td>
- </tr>
- </table>
- </form>
- </body>
- </html>
registerForm.jsp
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- <%@ 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>注冊頁面</title>
- </head>
- <body>
- <h3>注冊頁面</h3>
- <form action="register" method="post">
- <table>
- <tr>
- <td><label>登入名: </label></td>
- <td><input type="text" id="loginname" name="loginname" ></td>
- </tr>
- <tr>
- <td><label>密碼: </label></td>
- <td><input type="password" id="password" name="password"></td>
- </tr>
- <tr>
- <td><label>真實姓名: </label></td>
- <td><input type="text" id="username" name="username" ></td>
- </tr>
- <tr>
- <td><input id="submit" type="submit" value="注冊"></td>
- </tr>
- </table>
- </form>
- </body>
- </html>
welcome.jsp
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- <%@ 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>測試@RequestMapping注解</title>
- </head>
- <body>
- <!-- 頁面可以通路Controller傳遞傳遞出來的模型User對象 -->
- 歡迎[${requestScope.user.username }]登陸
- <br>
- </body>
- </html>
4.後端的實作
User.Java
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- package org.fkit.domain;
- import java.io.Serializable;
- //域對象,實作序列化接口
- 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
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- 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注解用于訓示該類是一個控制器,可以同時處理多個請求動作
- @Controller
- //RequestMapping可以用來注釋一個控制器類,此時,所有方法都将映射為相對于類級别的請求,
- //表示該控制器處理所有的請求都被映射到 value屬性所訓示的路徑下
- @RequestMapping(value="/user")
- public class UserController {
- // 靜态List<User>集合,此處代替資料庫用來儲存注冊的使用者資訊
- private static List<User> userList;
- // UserController類的構造器,初始化List<User>集合
- public UserController() {
- super();
- userList = new ArrayList<User>();
- // TODO Auto-generated constructor stub
- }
- // 靜态的日志類LogFactory
- private static final Log logger = LogFactory.getLog(UserController.class);
- // 該方法映射的請求為http://localhost:8080/context/user/register,該方法支援GET請求
- @RequestMapping(value="/register",method=RequestMethod.GET)
- public String registerForm() {
- logger.info("register GET方法被調用...");
- // 跳轉到注冊頁面
- return "registerForm";
- }
- // 該方法映射的請求為http://localhost:8080/RequestMappingTest/user/register,該方法支援POST請求
- @RequestMapping(value="/register",method=RequestMethod.POST)
- // 将請求中的loginname參數的值賦給loginname變量,password和username同樣處理
- public String register(@RequestParam("loginname") String loginname,
- @RequestParam("password") String password,
- @RequestParam("username") String username){
- logger.info("register POST方法被調用...");
- // 建立User對象
- User user=new User();
- user.setLoginname(loginname);
- user.setPassword(password);
- user.setUsername(username);
- // 模拟資料庫存儲User資訊
- userList.add(user);
- // 跳轉到登入頁面
- return "loginForm";
- }
- // 該方法映射的請求為http://localhost:8080/RequestMappingTest/user/login
- @RequestMapping("/login")
- public String login(
- // 将請求中的loginname參數的值賦給loginname變量,password同樣處理
- @RequestParam("loginname") String loginname,
- @RequestParam("password") String password,
- Model model){
- logger.info("登入名:"+loginname + " 密碼:" + password);
- // 到集合中查找使用者是否存在,此處用來模拟資料庫驗證
- for(User user :userList){
- if(user.getLoginname().equals(loginname) && user.getPassword().equals(password)){
- model.addAttribute("user",user);
- return "welcome";
- }
- }
- return "loginForm";
- }
- }
截圖:
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiIyVGduV2QvwVe0lmdhJ3ZvwFM38CXlZHbvN3cpR2Lc1TPB10QGtWUCpEMJ9CXsxWam9CXwADNvwVZ6l2c052bm9CXUJDT1wkNhVzLcRnbvZ2LcVHbHJmZWJjWwZ0RTZXUYpVd1kmYr50MZV3YyI2cKJDT29GRjBjUIF2LcRHelR3LcJzLctmch1mclRXY39DM5ATNzITM4ETMyMDM3EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
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