利用Maven来管理项目中的JAR包，同时使用Spring在业务处理层进行事务管理。数据库使用MySq，数据处理层使用Spring和Mybatis结合。

本案例代码主要结构如图：

1.数据库脚本

-- ----------------------------  -- Table structure for `user`  -- ----------------------------  DROP TABLE IF EXISTS `user`;  CREATE TABLE `user` (    `id` varchar(20) NOT NULL,    `name` varchar(20) default NULL,    PRIMARY KEY  (`id`)  ) ENGINE=InnoDB DEFAULT CHARSET=gb2312;    -- ----------------------------  -- Records of user  -- ----------------------------  INSERT INTO `user` VALUES ('001', '方舟子');  INSERT INTO `user` VALUES ('002', '小红');  INSERT INTO `user` VALUES ('003', '樱木滑到');  INSERT INTO `user` VALUES ('005', '桃木');  INSERT INTO `user` VALUES ('1', '张三');  INSERT INTO `user` VALUES ('2', '李四');

2.maven配置文件pom.xml

<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.hskj</groupId>   <artifactId>maven_spring</artifactId>   <version>0.0.1-SNAPSHOT</version>   <packaging>war</packaging>   <dependencies>    <!-- JUnit testing framework -->    <dependency>     <groupId>junit</groupId>     <artifactId>junit</artifactId>     <version>3.8.1</version>     <scope>test</scope>    </dependency>    <!-- Spring framework -->    <dependency>     <groupId>org.springframework</groupId>     <artifactId>spring-context</artifactId>     <version>3.2.6.RELEASE</version>    </dependency>    <dependency>     <groupId>org.springframework</groupId>     <artifactId>spring-jdbc</artifactId>     <version>3.2.6.RELEASE</version>    </dependency>    <!-- Spring AOP dependency -->    <dependency>     <groupId>cglib</groupId>     <artifactId>cglib</artifactId>     <version>2.2</version>    </dependency>    <!-- MySQL database driver -->    <dependency>     <groupId>mysql</groupId>     <artifactId>mysql-connector-java</artifactId>     <version>5.0.5</version>    </dependency>    <dependency>     <groupId>dom4j</groupId>     <artifactId>dom4j</artifactId>     <version>1.6.1</version>    </dependency>    <dependency>     <groupId>commons-logging</groupId>     <artifactId>commons-logging</artifactId>     <version>1.1.1</version>    </dependency>    <dependency>     <groupId>commons-collections</groupId>     <artifactId>commons-collections</artifactId>     <version>3.2.1</version>    </dependency>    <dependency>     <groupId>antlr</groupId>     <artifactId>antlr</artifactId>     <version>2.7.7</version>    </dependency>    <dependency>     <groupId>org.mybatis</groupId>     <artifactId>mybatis</artifactId>     <version>3.2.3</version>    </dependency>    <dependency>     <groupId>org.mybatis</groupId>     <artifactId>mybatis-spring</artifactId>     <version>1.2.1</version>    </dependency>    <dependency>     <groupId>c3p0</groupId>     <artifactId>c3p0</artifactId>     <version>0.9.1.2</version>    </dependency>    <dependency>     <groupId>org.aspectj</groupId>     <artifactId>aspectjweaver</artifactId>     <version>1.7.4</version>    </dependency>   </dependencies>  </project>

 3.数据库配置文件config.properties

db.driverClass=org.gjt.mm.mysql.Driver  db.jdbcUrl=jdbc:mysql://localhost:3306/test  db.user=root  db.password=root  #  db.initialPoolSize=20  db.maxIdleTime=60  db.maxPoolSize=200  db.minPoolSize=50  #  db.acquireIncrement=3  db.acquireRetryDelay=1000  db.acquireRetryAttempts=30  db.breakAfterAcquireFailure=false

4.Spring配置文件applicationContext.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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"   xmlns:mvc="http://www.springframework.org/schema/mvc"   xsi:schemaLocation="       http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd                http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.0.xsd                http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx.xsd               http://www.springframework.org/schema/aop       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd              http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">       <!-- 加载配置文件 -->   <context:property-placeholder location="config.properties" />   <!-- 指定spring注解注入层 -->   <context:component-scan base-package="com.hskj" />   <!-- 数据库连接池管理 -->   <bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"    destroy-method="close">    <property name="driverClass" value="${db.driverClass}"></property>    <property name="jdbcUrl" value="${db.jdbcUrl}"></property>    <property name="user" value="${db.user}"></property>    <property name="password" value="${db.password}"></property>        <property name="initialPoolSize" value="${db.initialPoolSize}"></property>      <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->    <property name="maxIdleTime" value="${db.maxIdleTime}"></property>    <!--连接池中保留的最大连接数。Default: 15 -->    <property name="maxPoolSize" value="${db.maxPoolSize}"></property>    <property name="minPoolSize" value="${db.minPoolSize}"></property>      <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->    <property name="acquireIncrement" value="${db.acquireIncrement}"></property>    <!--两次连接中间隔时间，单位毫秒。Default: 1000 -->    <property name="acquireRetryDelay" value="${db.acquireRetryDelay}"></property>    <!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 -->    <property name="acquireRetryAttempts" value="${db.acquireRetryAttempts}"></property>    <!--获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效保留，并在下次调用getConnection()的时候继续尝试获取连接。如果设为true，那么在尝试      获取连接失败后该数据源将申明已断开并永久关闭。Default: false -->    <property name="breakAfterAcquireFailure" value="${db.breakAfterAcquireFailure}"></property>   </bean>     <!-- ================================事务相关控制================================================= -->     <bean name="transactionManager"    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">    <property name="dataSource" ref="c3p0DataSource"></property>   </bean>     <tx:advice id="userTxAdvice" transaction-manager="transactionManager">    <tx:attributes>     <tx:method name="delete*" propagation="REQUIRED" read-only="false"      rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException" />     <tx:method name="insert*" propagation="REQUIRED" read-only="false"      rollback-for="java.lang.RuntimeException" />     <tx:method name="update*" propagation="REQUIRED" read-only="false"      rollback-for="java.lang.Exception" />     <tx:method name="find*" propagation="SUPPORTS" />     <tx:method name="get*" propagation="SUPPORTS" />     <tx:method name="select*" propagation="SUPPORTS" />    </tx:attributes>   </tx:advice>     <aop:config>    <aop:pointcut id="pc"     expression="execution(public * com.hskj.service.*.*(..))" /> <!--把事务控制在Service层 -->    <aop:advisor pointcut-ref="pc" advice-ref="userTxAdvice" />   </aop:config>       <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">    <property name="dataSource" ref="c3p0DataSource" />    <property name="configLocation" value="MyBatis-Configuration.xml" />   </bean>       <bean class="org.mybatis.spring.mapper.MapperFactoryBean">    <property name="mapperInterface" value="com.hskj.mapper.UserMapper" />    <property name="sqlSessionFactory" ref="sqlSessionFactory" />   </bean>        </beans>

（1）MyBatis-Configuration.xml  <?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>      <mappers>          <mapper resource="UserDaoMapper.xml"/>      </mappers>  </configuration>    （2）UserDaoMapper.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="com.hskj.mapper.UserMapper">      <parameterMap type="com.hskj.domain.User" id="parameterMapUser">      <parameter property="id"/>      <parameter property="name"/>    </parameterMap>        <resultMap type="com.hskj.domain.User" id="resultMapUser">      <result property="id" column="id"/>      <result property="name" column="name"/>    </resultMap>        <insert id="insertUser" parameterMap="parameterMapUser">      INSERT INTO user(id,name)      VALUES(?,?)    </insert>    <select id="countAll" resultType="int">          select count(*) c from user;    </select>    <select id="getAllUser"  resultMap="resultMapUser">      SELECT * FROM user    </select>    <select id="getById" parameterType="String" resultMap="resultMapUser">      SELECT * FROM user      WHERE id=#{value}    </select>    <delete id="deleteUser" parameterType="String">      DELETE FROM user       WHERE id=#{value}    </delete>    <update id="updateUser" parameterType="java.util.Map">      UPDATE user      SET name=#{name}      WHERE id=#{id}    </update>  </mapper>

package com.hskj.mapper;    import java.util.List;  import java.util.Map;  import org.springframework.stereotype.Service;  import com.hskj.domain.User;    @Service("userMapper")  public interface UserMapper {      public int countAll();      public void insertUser(User user);      public List<User> getAllUser();      public User getById(String id);      public void deleteUser(String id);      public void updateUser(Map<String,Object> map);  }

package com.hskj.dao;    import java.util.List;  import java.util.Map;    import com.hskj.domain.User;    public interface UserDao {       public int countAll();       public void insertUser(User user);       public List<User> getAllUser();       public User getById(String id);       public void deleteUser(String id);       public void updateUser(Map<String,Object> map);    }

package com.hskj.daoImpl;    import java.util.List;  import java.util.Map;    import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Service;    import com.hskj.dao.UserDao;  import com.hskj.domain.User;  import com.hskj.mapper.UserMapper;    @Service("userDao")  public class UserDaoImpl implements UserDao{   @Autowired   private UserMapper userMapper;      public int countAll() {    return  this.userMapper.countAll();   }     @Override   public void insertUser(User user) {     this.userMapper.insertUser(user);           }     @Override   public List<User> getAllUser() {    return this.userMapper.getAllUser();   }     @Override   public User getById(String id) {    return this.userMapper.getById(id);   }     @Override   public void deleteUser(String id) {    this.userMapper.deleteUser(id);       }     @Override   public void updateUser(Map<String, Object> map) {    this.userMapper.updateUser(map);   }    }

package com.hskj.service;    import java.util.Map;    import com.hskj.domain.User;    public interface UserService {      public int countAll();      public void insertUser(User user);      public void update_insert(Map map,User user);    }

package com.hskj.serviceImpl;    import java.util.Map;    import org.springframework.beans.factory.annotation.Autowired;  import org.springframework.stereotype.Service;    import com.hskj.dao.UserDao;  import com.hskj.domain.User;  import com.hskj.service.UserService;  @Service("userService")  public class UserServiceImpl implements UserService {      @Autowired   private UserDao userDao;       public int countAll() {          return this.userDao.countAll();      }     @Override   public void insertUser(User user) {    this.userDao.insertUser(user);    throw new RuntimeException("Error");   }       @Override   public void update_insert(Map map,User user) {    this.userDao.updateUser(map);    this.userDao.insertUser(user);    throw new RuntimeException("Error");       }        }

package com.hskj.domain;    public class User {   private String id;   private String name;     public String getId() {    return id;   }     public void setId(String id) {    this.id = id;   }     public String getName() {    return name;   }     public void setName(String name) {    this.name = name;   }     public User() {     }     public User(String id, String name) {    super();    this.id = id;    this.name = name;   }  }

import java.util.HashMap;  import java.util.Map;    import org.junit.Test;  import org.springframework.context.ApplicationContext;  import org.springframework.context.support.ClassPathXmlApplicationContext;    import com.hskj.domain.User;  import com.hskj.service.UserService;    public class UserServiceTest {            @Test      public void userServiceTest(){          @SuppressWarnings("resource")    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");          UserService userService = (UserService)context.getBean("userService");          User user =new User();          user.setId("003");          user.setName("樱木花道");                    Map map=new HashMap();          map.put("id", "001");          map.put("name", "方舟子");          try {             System.out.println(userService.countAll());           //userService.update_insert(map, user);          //  userService.insertUser(user);//    } catch (Exception e) {     e.printStackTrace();    }                       }  }