基于SSM框架实现简单的登录注册的示例代码

<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>com.imooc</groupId>  <artifactId>userLogin</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>war</packaging>  <dependencies>    <dependency>      <!-- 使用junit4 用注解方式 -->      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>4.11</version>      <scope>test</scope>    </dependency>    <!-- 补全项目依赖 -->    <!-- 1：日志 java日志：slf4j，log4j，logback，common-logging slf4j 是规范/接口 日志实现:log4j,logback,common-logging       使用：slf4j + logback -->    <dependency>      <groupId>org.slf4j</groupId>      <artifactId>slf4j-api</artifactId>      <version>1.7.12</version>    </dependency>    <dependency>      <groupId>ch.qos.logback</groupId>      <artifactId>logback-core</artifactId>      <version>1.1.1</version>    </dependency>    <!-- 实现slf4j接口并整合 -->    <dependency>      <groupId>ch.qos.logback</groupId>      <artifactId>logback-classic</artifactId>      <version>1.1.1</version>    </dependency>    <!-- 2：数据库相关依赖 -->    <dependency>      <groupId>mysql</groupId>      <artifactId>mysql-connector-java</artifactId>      <version>5.1.35</version>      <scope>runtime</scope>    </dependency>    <dependency>      <groupId>c3p0</groupId>      <artifactId>c3p0</artifactId>      <version>0.9.1.2</version>    </dependency>    <!-- DAO框架：MyBatis依赖 -->    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis</artifactId>      <version>3.3.0</version>    </dependency>    <!-- mybatis自身实现的spring整合依赖 -->    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis-spring</artifactId>      <version>1.2.3</version>    </dependency>    <!--:3：servlet web相关依赖 -->    <dependency>      <groupId>taglibs</groupId>      <artifactId>standard</artifactId>      <version>1.1.2</version>    </dependency>    <dependency>      <groupId>jstl</groupId>      <artifactId>jstl</artifactId>      <version>1.2</version>    </dependency>    <dependency>      <groupId>com.fasterxml.jackson.core</groupId>      <artifactId>jackson-databind</artifactId>      <version>2.5.4</version>    </dependency>    <dependency>      <groupId>javax.servlet</groupId>      <artifactId>javax.servlet-api</artifactId>      <version>3.1.0</version>    </dependency>    <!-- 4：spring依赖 -->    <!-- 1)spring核心依赖 -->    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-core</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-beans</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-context</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <!-- 2)spring dao层依赖 -->    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-jdbc</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-tx</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <!-- 3)spring web相关依赖 -->    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-web</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-webmvc</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>    <!-- 4)spring test相关依赖 -->    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-test</artifactId>      <version>4.2.0.RELEASE</version>    </dependency>  </dependencies>  <build>    <finalName>userLogin</finalName>    <plugins>      <!-- define the project compile level -->      <!-- maven编译用的版本控制，控制jdk的版本不会回跳 -->      <plugin>        <groupId>org.apache.maven.plugins</groupId>        <artifactId>maven-compiler-plugin</artifactId>        <version>2.3.2</version>        <configuration>          <source>1.8</source>          <target>1.8</target>        </configuration>      </plugin>    </plugins>  </build></project>

jdbc.driverClass=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/mysystem?useUnicode=true&characterEncoding=UTF-8jdbc.username=rootjdbc.password=kongtao

<?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:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"     xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx.xsd    http://www.springframework.org/schema/mvc     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd    ">  <!-- 配置springMVC -->  <!-- 1：开启springMVC注解模式 -->  <!-- 简化配置：     (1)自动注册DefaultAnnotationHandlerMapping，AnnotationMethodHandlerAdapter     (2)提供一系列：数据绑定，数字和日期的format @NumberFormat,@DataTimeFormat    xml,json默认读写支持   -->  <mvc:annotation-driven/>    <!-- 2：配置jsp显示ViewResolver -->  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>    <property name="prefix" value="/WEB-INF/jsp/" />    <property name="suffix" value=".jsp" />  </bean>  <!-- 3：扫描web相关的bean -->  <context:component-scan base-package="com.sy.controller" /></beans>

package com.sy.dao;import org.apache.ibatis.annotations.Param;import com.sy.entity.User;public interface UserDao {      /**   * 查找用户名和密码   * @param username 登录用户名    * @return   */  User findByUsername(String username);  /**   * 注册用户和密码   */  void registerByUsernameAndPassword(@Param("username")String username,                    @Param("password")String password);}

<?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="com.sy.dao.UserDao">  <!-- 目的：为DAO接口方法提供sql语句配置 -->  <!-- 查询用户和密码进行登录 -->  <select id="findByUsername" resultType="User" parameterType="String">      select * from user where username = #{username}        </select>  <!--增加用户名和密码进行注册 -->  <insert id="registerByUsernameAndPassword">     insert into user (username,password)    values (#{username},#{password})  </insert>  </mapper>

package com.sy.controller;import javax.servlet.http.HttpSession;import org.springframework.beans.factory.annotation.Autowired;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.SessionAttributes;import com.sy.entity.User;import com.sy.service.UserService;@Controller@RequestMapping("/user")//这里用了@SessionAttributes，可以直接把model中的user(也就key)放入其中//这样保证了session中存在user这个对象@SessionAttributes("user")public class UserController {    @Autowired  private UserService userServivce;    //正常访问login页面  @RequestMapping("/login")  public String login(){    return "login";  }    //表单提交过来的路径  @RequestMapping("/checkLogin")  public String checkLogin(User user,Model model){    //调用service方法    user = userServivce.checkLogin(user.getUsername(), user.getPassword());    //若有user则添加到model里并且跳转到成功页面    if(user != null){      model.addAttribute("user",user);      return "success";    }    return "fail";  }    //测试超链接跳转到另一个页面是否可以取到session值  @RequestMapping("/anotherpage")  public String hrefpage(){        return "anotherpage";  }    //注销方法  @RequestMapping("/outLogin")  public String outLogin(HttpSession session){    //通过session.invalidata()方法来注销当前的session    session.invalidate();    return "login";  }  @RequestMapping("/regist")  public String regist(){    return "regist";  }  @RequestMapping("/doRegist")  public String doRegist(User user,Model model){    System.out.println(user.getUsername());    userServivce.Regist(user);    return "success";  }}

package com.sy.entity;public class User {      private String id;    private String username;    private String password;  public String getId() {    return id;  }  public void setId(String 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;  }}

package com.sy.service;import com.sy.entity.User;//Service层接口public interface UserService {    //检验用户登录  User checkLogin(String username,String password);  void Regist(User user);}

package com.sy.service.Impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.sy.dao.UserDao;import com.sy.entity.User;import com.sy.service.UserService;@Servicepublic class UserServiceImpl implements UserService{  @Autowired  private UserDao userDao;    /*    * 检验用户登录业务   *    */  public User checkLogin(String username, String password) {        User user = userDao.findByUsername(username);    if(user != null && user.getPassword().equals(password)){          return user;    }    return null;  }  @Override  public void Regist(User user) {    userDao.registerByUsernameAndPassword(user.getUsername(),user.getPassword());  }}

<?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:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx.xsd">  <!-- 配置整合mybatis过程 -->  <!-- 1:配置数据库相关参数 properties的属性:${url}-->  <context:property-placeholder location="classpath:jdbc.properties"/>  <!-- 2:数据库连接池 -->  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">    <!-- 配置连接池属性 -->    <property name="driverClass" value="${jdbc.driverClass}"/>    <property name="jdbcUrl" value="${jdbc.url}"/>    <property name="user" value="${jdbc.username}"/>    <property name="password" value="${jdbc.password}"/>      <!-- c3p0连接池的私有属性 -->    <property name="maxPoolSize" value="30"/>    <property name="minPoolSize" value="10"/>    <!-- 关闭连接后不自动commit -->    <property name="autoCommitOnClose" value="false"/>    <!-- 获取连接超时时间 -->    <property name="checkoutTimeout" value="1000"/>    <!-- 当获取连接失败重试次数 -->    <property name="acquireRetryAttempts" value="2"/>  </bean>    <!-- 约定大于配置 -->  <!-- 3:配置sqlsessionfactory对象 -->  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">    <!-- 注入数据库连接池 -->    <property name="dataSource" ref="dataSource"/>    <!-- 配置mybatis全局配置文件:mybatis-config.xml -->    <property name="configLocation" value="classpath:mybatis-config.xml"/>    <!-- 扫描entity包 使用别名 com.sy.entity.User ->User -->    <property name="typeAliasesPackage" value="com.sy.entity"/>    <!-- 扫描sql配置文件：mapping需要的xml文件 -->    <property name="mapperLocations" value="classpath:mapper/*.xml"/>  </bean>    <!-- 4：配置扫描Dao接口的包，动态实现Dao接口，注入到Spring容器中 -->  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">    <!-- 注入sqlsessionfactory -->    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>    <!-- 给出需要扫描的Dao接口包 -->    <property name="basePackage" value="com.sy.dao"/>  </bean></beans>

<?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:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx.xsd">  <!-- 扫描service包下所有使用注解的类型 -->  <context:component-scan base-package="com.sy.service"/>  <!-- 配置事务管理器 -->  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">    <!-- 注入数据库的连接池 -->    <property name="dataSource" ref="dataSource"/>  </bean>    <!-- 配置基于注解的声明式事务    默认使用注解来管理事务行为   -->  <tx:annotation-driven transaction-manager="transactionManager"/></beans>

<?xml version="1.0" encoding="UTF-8"?><configuration debug="true">  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">    <!-- encoders are by default assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder -->    <encoder>      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n      </pattern>    </encoder>  </appender>  <root level="debug">    <appender-ref ref="STDOUT" />  </root></configuration>

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration>  <!-- 配置全局属性 -->  <settings>    <!--使用jdbc的getGeneratedKeys获取数据库自增主键值 -->    <setting name="useGeneratedKeys" value="true"/>    <!-- 使用列别名替换列名  默认：true      select name as title from table     -->    <setting name="useColumnLabel" value="true"/>    <!-- 开启驼峰命名转换：Table(create_time) -> Entity(createTime) -->    <setting name="mapUnderscoreToCamelCase" value="true"/>  </settings>  </configuration>

<%@ 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 background="images/bg1.jpg">  <form action="${pageContext.request.contextPath}/user/checkLogin" method="post">    <table>      <tr>        <td>用户名:</td>        <td><input id="username" name="username" type="text"></td>      </tr>      <tr>        <td>密码:</td>        <td><input id="password" name="password" type="password"></td>      </tr>      <tr >        <td><input type="submit" value="登录" ></td>        <td><input type="button" value="注册" onclick="window.location.href='/user/regist'"> </td>      </tr>    </table>  </form></body></html>

<%-- Created by IntelliJ IDEA. User: 86265 Date: 2018/1/30 Time: 10:32 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>  <title>用户注册页面</title></head><body>  <h3>注册页面</h3>  <hr/>  <form action="${pageContext.request.contextPath}/user/doRegist" method="post">    <table border="1px">      <tr height="35px">        <td width="150px">用户名</td>        <td width="300px">          <input type="text" name="username" id="username">        </td>      </tr>      <tr height="35px">        <td>密码</td>        <td>          <input type="text" name="password" id="password">        </td>      </tr>      <tr>        <td colspan="2" align="center">          <input type="submit" id="regist" value="注册"/>        </td>      </tr>    </table>  </form></body></html>

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!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>  <div>    <strong> welcome,${sessionScope.user.username}! </strong>  </div>  this is success page!  <a href="${pageContext.request.contextPath}/user/anotherpage" rel="external nofollow" >点我跳到另一个页面</a>  <form action="${pageContext.request.contextPath}/user/login">    <table>      <tr>        <td><input type="submit" value="退出登录"></td>      </tr>    </table>  </form></body></html>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"  pageEncoding="ISO-8859-1"%><!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=ISO-8859-1"><title>Insert title here</title></head><body>    u are loser,this is a fail page!</body></html>

<%@ 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>  <div>    <strong> ${sessionScope.user.username}!!!!! </strong>  </div>  <form action="user/outLogin">    <table>      <tr>        <td><input type="submit" value="退出登录" ></td>      </tr>    </table>  </form></body></html>