一、采用MVC设计模式

二、用户登录运行效果

三、基于XML配置方式搭建SSM框架实现用户登录

（一）创建数据库与表 - simonshop (t_user)

• 创建数据库 - simonshop
  
• 创建用户表 - t_user
  

CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(20) NOT NULL,
  `password` varchar(20) DEFAULT NULL,
  `telephone` varchar(11) DEFAULT NULL,
  `register_time` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
  `popedom` int(11) DEFAULT NULL COMMENT '0：管理员；1：普通用户',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

• 在用户表里插入记录
  

INSERT INTO `t_user` VALUES ('1', 'admin', '12345', '15734345678', '2016-12-02 08:40:35', '0');
INSERT INTO `t_user` VALUES ('2', '郑晓红', '11111', '13956567889', '2016-12-20 09:51:43', '1');
INSERT INTO `t_user` VALUES ('3', '温志军', '22222', '13956678907', '2016-12-20 09:52:36', '1');
INSERT INTO `t_user` VALUES ('4', '涂文艳', '33333', '15890905678', '2016-12-05 09:52:56', '1');

（二）创建Maven项目 - SSMLogin

（三）在pom.xml文件里添加相关依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
         http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>net.hw.shop</groupId>
    <artifactId>SSMLogin</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <!-- spring.version -->
        <spring.version>5.2.9.RELEASE</spring.version>
    </properties>

    <dependencies>
        <!--Spring核心-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring Bean-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring容器-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring测试-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring数据库支持-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--数据库驱动工具包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <!--数据库连接池框架-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.24</version>
        </dependency>
        <!--持久层框架-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <!--提供MyBatis与Spring整合的支持-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>
        <!--日志框架-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!--Spring AOP-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--AspectJ支持-->
        <dependency>
            <groupId>aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.5.4</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
            <scope>runtime</scope>
        </dependency>
        <!--单元测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
        <!--Spring Web-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring MVC-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--JSP标准标签库-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--Servlet-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

（四）创建日志属性文件 - log4j.properties

log4j.rootLogger=WARN, stdout, logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

（五）创建数据库配置属性文件 - jdbc.properties

jdbc.driverClassName = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/simonshop?useSSL=false
jdbc.username = root
jdbc.password = p@ssw0rd

• 说明：jdbc.url有时可能还需设置编码和时区

（六）给项目添加Web功能

• 打开项目结构窗口，按照演示进行操作
  
  

（七）配置Tomcat服务器

• 单击工具栏上的【Add Configuration…】，按照演示进行操作
  
  

（八）创建用户实体类 - User

• 创建net.hw.shop.bean包，在包里创建User类
  

package net.hw.shop.bean;

import java.util.Date;

/**
 * 功能：用户实体类
 * 作者：华卫
 * 日期：2020年10月01日
 */
public class User {
    
    
    private int id;
    private String username;
    private String password;
    private String telephone;
    private Date registerTime;
    private int popedom;

    public int getId() {
    
    
        return id;
    }

    public void setId(int id) {
    
    
        this.id = id;
    }

    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;
    }

    public String getTelephone() {
    
    
        return telephone;
    }

    public void setTelephone(String telephone) {
    
    
        this.telephone = telephone;
    }

    public Date getRegisterTime() {
    
    
        return registerTime;
    }

    public void setRegisterTime(Date registerTime) {
    
    
        this.registerTime = registerTime;
    }

    public int getPopedom() {
    
    
        return popedom;
    }

    public void setPopedom(int popedom) {
    
    
        this.popedom = popedom;
    }

    @Override
    public String toString() {
    
    
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", telephone='" + telephone + '\'' +
                ", registerTime=" + registerTime +
                ", popedom=" + popedom +
                '}';
    }
}

（九）创建用户映射器接口 - UserMapper

• 创建net.hw.shop.mapper包，在包里创建UserMapper接口
  

package net.hw.shop.mapper;

import net.hw.shop.bean.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

/**
 * 功能：用户映射器接口
 * 作者：华卫
 * 日期：2020年10月01日
 */
@Repository
public interface UserMapper {
    
    
    User login(@Param("username") String username, @Param("password") String password);
}

（十）创建用户服务类 - UserService

• 在net.hw.shop包里创建service子包，然后在子包里创建UserService类
  

package net.hw.shop.service;

import net.hw.shop.bean.User;
import net.hw.shop.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 功能：用户服务类
 * 作者：华卫
 * 日期：2020年10月01日
 */
@Service
public class UserService {
    
    
    @Autowired
    private UserMapper userMapper;
    
    public User login(String username, String password) {
    
    
        return userMapper.login(username, password);
    }
}

（十一）创建用户控制器 - UserController

• 在net.hw.shop包里创建controller子包，然后在子包里创建UserController类
  

package net.hw.shop.controller;

import net.hw.shop.bean.User;
import net.hw.shop.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

/**
 * 功能：用户控制器
 * 作者：华卫
 * 日期：2020年10月01日
 */
@Controller
@RequestMapping("/user")
public class UserController {
    
    
    @Resource
    private UserService userService;

    @RequestMapping("/login")
    public String login(@RequestParam("username") String username,
                        @RequestParam("password") String password,
                        HttpSession session) {
    
    
        // 调用用户服务对象的登录方法
        User user = userService.login(username, password);
        // 判断是否登录成功
        if (user != null) {
    
    
            session.setAttribute("username", username);
            session.removeAttribute("loginMsg");
            // 判断用户的角色
            if (user.getPopedom() == 0) {
    
    
                // 映射到后台管理页面
                return "backend/management";
            } else {
    
    
                // 映射到前台首页
                return "frontend/index";
            }
        } else {
    
    
            session.setAttribute("loginMsg", "用户名或密码错误！");
            // 映射到前台登录页面
            return "frontend/login";
        }
    }

    @RequestMapping("/logout")
    public String logout(HttpSession session) {
    
    
        // 删除会话属性
        session.removeAttribute("username");
        // 结束会话
        session.invalidate();
        // 映射到前台登录页面
        return "frontend/login";
    }
}

（十二）创建用户映射器配置文件 - UserMapper.xml

• 在resources里创建mapper子目录，然后在子目录里创建UserMapper.xml
  

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="net.hw.shop.mapper.UserMapper">
    <resultMap id="userMap" type="net.hw.shop.bean.User">
        <result property="id" column="id"/>
        <result property="username" column="username"/>
        <result property="password" column="password"/>
        <result property="telephone" column="telephone"/>
        <result property="registerTime" javaType="java.util.Date" column="register_time" jdbcType="TIMESTAMP"/>
        <result property="popedom" column="popedom"/>
    </resultMap>

    <select id="login" resultMap="userMap">
        SELECT * FROM t_user WHERE username = #{username} AND password = #{password};
    </select>
</mapper>

（十三）创建Spring配置文件 - spring-config.xml

• 在resources里创建config子目录，然后在子目录里创建spring-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: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/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--组件扫描-->
    <context:component-scan base-package="net.hw.shop"/>

    <!--读取jdbc属性文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 定义数据源Bean，使用阿里开源Druid数据源实现 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <!-- 基本属性 url、user、password -->
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="10"/>
        <property name="minIdle" value="10"/>
        <property name="maxActive" value="200"/>

        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="6000"/>

        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000"/>

        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000"/>

        <property name="validationQuery" value="SELECT 'x'"/>
        <property name="testWhileIdle" value="true"/>
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="false"/>

        <!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
        <property name="poolPreparedStatements" value="true"/>
        <property name="maxPoolPreparedStatementPerConnectionSize" value="100"/>

        <!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->
        <property name="filters" value="stat"/>
    </bean>

    <!--定义MyBatis的SqlSessionFactory-->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--使用MapperScannerConfigurer查找类路径下映射器并自动将其实例化为MapperFactoryBean-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="net.hw.shop.mapper"/>
    </bean>
</beans>

• 说明：本案例没有对数据库进行更新操作，因此没有引入事务管理
• 如果项目里对数据库有更新操作，那么UserService应该添加@Transactional注解，而且Spring配置文件里还要添加事务管理

<!-- 事务注解驱动，标注@Transactional的类和方法将具有事务性 -->                                                 
<tx:annotation-driven transaction-manager="txManager" />                                    
                                                                                            
<!--定义事务管理通知-->                                                                             
<tx:advice id="txAdvice" transaction-manager="txManager">                                   
    <tx:attributes>                                                                         
        <tx:method name="find*" read-only="true"/>                                          
        <tx:method name="add*" propagation="REQUIRED"/>                                     
        <tx:method name="delete*" propagation="REQUIRED"/>                                  
        <tx:method name="update*" propagation="REQUIRED"/>                                  
    </tx:attributes>                                                                        
</tx:advice>                                                                                
                                                                                            
<!--声明式事务通知器，需要在pom.xml里添加基于AspectJ的AOP支持-->                                                
<aop:config>                                                                                
    <aop:pointcut id="mypt" expression="execution(public * net.hw.shop.service..*.*(..))"/> 
    <aop:advisor advice-ref="txAdvice" pointcut-ref="mypt"/>                                
</aop:config>                                                                               

（十四）创建Spring MVC配置文件 - spring-mvc-config.xml

• 在resources/config目录里创建spring-mvc-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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" 
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--处理对静态资源的请求-->
    <mvc:resources mapping="/css/**" location="/WEB-INF/css/"/>
    <mvc:resources mapping="/js/**" location="/WEB-INF/js/"/>
    <mvc:resources mapping="/images/**" location="/WEB-INF/images/"/>

    <!--采用注解驱动-->
    <mvc:annotation-driven/>

    <!--定义视图控制器-->
    <mvc:view-controller path="user/login" view-name="frontend/login" />

    <!--扫描添加Controller注解的类-->
    <context:component-scan base-package="net.hw.shop.controller"/>

    <!--定义内部资源视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:viewClass="org.springframework.web.servlet.view.JstlView"
          p:prefix="/WEB-INF/views/"
          p:suffix=".jsp"/>

    <!-- 扫描业务组件，让spring不扫描带有@Service注解的类(留在spring-config.xml中扫描@Service注解的类)，防止事务失效 -->
    <context:component-scan base-package="net.hw.shop">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
    </context:component-scan>
</beans>

（十五）编辑Web部署描述文件 - web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <display-name>simonshop</display-name>
    <welcome-file-list>
        <welcome-file>/WEB-INF/views/frontend/login.jsp</welcome-file>
    </welcome-file-list>

    <!--Spring监听器，让Spring随Web项目启动而初始化-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 指定Spring配置文件位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:config/spring-config.xml</param-value>
    </context-param>

    <!--配置Spring前端控制器，通过初始化参数设置读取控制器配置文件-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:config/spring-mvc-config.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--设置字符编码过滤器-->
    <filter>
        <filter-name>Character Encoding</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>Character Encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

（十六）准备图片资源

• 在WEB-INF里创建images目录，用来存放图片资源
  

（十七）创建样式文件 - login.css

• 在WEB-INF里创建css子目录，然后在子目录里创建login.css
  

/* 样式 */
body {
    
    
    margin: 0px;
    text-align: center;
    background: #cccccc;
}

（十八）创建脚本文件 - check.js

• 在WEB-INF里创建js子目录，然后在子目录里创建check.js
  

/**
 * 检验登录表单
 * 
 * @returns {Boolean}
 */
function checkLoginForm() {
    
    	
	// 获取用户名文本框
	var username = document.getElementById("username");
	// 获取密码文本框
	var password = document.getElementById("password");
	// 非空校验
	if (username.value == "") {
    
    
		alert("用户名不能为空！");
		// 让用户名文本框获得焦点
		username.focus();
		return false;
	}
	if (password.value == "") {
    
    
		alert("密码不能为空！");
		// 让密码文本框获得焦点
		password.focus();
		return false;
	}	
		
	return true; // 表明可以提交数据到服务器端
}

（十九）创建页面

1、创建目录结构

2、创建登录页面 - login.jsp

• 在views/frontend里创建login.jsp
  

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:set var="path" value="${pageContext.request.contextPath}"/>
<c:set var="basePath"
       value="${pageContext.request.scheme}://${pageContext.request.serverName}:${pageContext.request.serverPort}${path}/"/>
<html>
<head>
    <title>用户登录</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" >
    <base href="${basePath}">
    <script src="js/check.js"></script>
    <link href="css/login.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<h3 style="text-align: center">用户登录</h3>
<form id="frmLogin" action="user/login" method="post">
    <table class="tb" border="1" cellpadding="10" style="margin: 0px auto">
        <tr>
            <td align="center">账号</td>
            <td><input id="username" type="text" name="username"/></td>
        </tr>
        <tr>
            <td align="center">密码</td>
            <td><input id="password" type="password" name="password"/></td>
        </tr>
        <tr align="center">
            <td colspan="2">
                <input type="submit" value="登录" onclick="return checkLoginForm()"/>
                <input type="reset" value="重置"/>
            </td>
        </tr>
    </table>
</form>
<c:if test="${loginMsg!=null}">
    <script type="text/javascript">alert("${loginMsg}")</script>
    <c:remove var="loginMsg"/>
</c:if>
</body>
</html>

3、创建网站首页 - index.jsp

• 在views/frontend里创建index.jsp
  

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:set var="path" value="${pageContext.request.contextPath}"/>
<c:set var="basePath"
       value="${pageContext.request.scheme}://${pageContext.request.serverName}:${pageContext.request.serverPort}${path}/"/>
<html>
<head>
    <title>首页</title>
    <base href="${basePath}">
</head>
<body>
<h3>欢迎访问西蒙购物网</h3>
登录用户：${username} —— <a href="user/logout">注销</a><br/>
<img src="images/bear.jpg" width="300" height="250">
</body>
</html>

4、创建后台管理页面 - management.jsp

• 在views/backend里创建management.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:set var="path" value="${pageContext.request.contextPath}"/>
<c:set var="basePath"
       value="${pageContext.request.scheme}://${pageContext.request.serverName}:${pageContext.request.serverPort}${path}/"/>
<html>
<head>
    <title>后台管理</title>
    <base href="${basePath}">
</head>
<body>
<h3>西蒙购物网后台管理</h3>
管理员：${username} —— <a href="user/logout">注销</a><br/>
<img src="images/bear.jpg" width="300" height="250">
</body>
</html>

（二十）启动服务器，查看效果