Spring MVC的@RequestMapping和@RequestParam注解的使用

迈不过友情╰ 2021-07-24 12:26 373阅读 0赞

**一 领域模型**

package org.fkit.domain;
    import java.io.Serializable;
    // 域对象，实现序列化接口
    public class User implements Serializable{
         
         private static final long serialVersionUID = 1L;
         
         // 私有字段
         private String loginname;
         private String password;
         private String username;
         
         // 公共构造器
         public User() {
               super();
         }
         // set/get方法
         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;
         }
         
    }

**二 控制器**

package org.fkit.controller;
    
    import java.util.ArrayList;
    import java.util.List;
    import org.fkit.domain.User;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    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>();
        }
    
        // 该方法映射的请求为http://localhost:8080/context/user/register，该方法支持GET请求
        @GetMapping(value="/register")
         public String registerForm() {
            System.out.println("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
         @PostMapping(value="/register")
         // 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) {
             System.out.println("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) {
             System.out.println("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";
         }
    
    }

**三 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:p="http://www.springframework.org/schema/p"
        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.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd     
            http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd">
            
        
        <context:component-scan base-package="org.fkit.controller"/>
        
        <mvc:annotation-driven/>
         
        <mvc:default-servlet-handler/>
        
        
         <bean id="viewResolver"
               class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
        
    </beans>

**四 视图**

1 注册页面

<%@ 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>

2 登录页面

<%@ 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>

3 欢迎页面

**五 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/88d0b4ab87664b2da0373109b4e2d566.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1]: /images/20210724/71e80c87c6d54d8ba91a30d16e323950.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/a5e5d0048b90409ab1d84a2877700ded.png