1，本文采用的Mybatis框架版本为： mybatis-3.0.4.jar 2， 以持久化一个简单的User bean为例 User实体类的代码如下： Java代码 复制代码 收藏代码1.package bean;   2.   3.public class User {   4.    private String name;   5.    private Integer age;   6.   7.    public String getName() {   8.       return name;   9.    }   10.    public void setName(String name) {   11.       this.name = name;   12.    }   13.    public Integer getAge() {   14.       return age;   15.    }   16.    public void setAge(Integer age) {   17.       this.age = age;   18.    }   19.    public User(String name, Integer age) {   20.       super();   21.       this.name = name;   22.       this.age = age;   23.    }   24.   25.    public User() {   26.       super();   27.    }  //必须要有这个无参构造方法，不然根据UserMapper.xml中的配置，在查询数据库时，将不能反射构造出User实例   28.}  User实体的映射器取名为UserMapper(接口)，其代码如下 Java代码 复制代码 收藏代码1.package Mapper;   2.import bean.User;   3.   4.public interface UserMapper {   5.    public void insertUser(User user);   6.    public User getUser(String name);   7.}  注意，该接口类似于Hibernate中的DAO层接口，唯一不同的是，MyBatis中，只声明该接口就可以，不需要去实现. UserMapper映射器对应的配置文件如下(相当于Hibernate中的User.hbm.xml,当然这里面不是属性映射字段，而是直接是映射器中各种方法对应的sql语句)： Xml代码 复制代码 收藏代码1.<?xml version="1.0" encoding="UTF-8" ?>   2.<!DOCTYPE mapper   3.    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"   4.    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">   5.<mapper namespace="Mapper.UserMapper">   6.<!-- 这里namespace必须是UserMapper接口的路径，不然要运行的时候要报错 “is not known to the MapperRegistry”-->   7.    <insert id="insertUser" parameterType="User">   8.       insert into vincent_user(name,age) values(#{name},#{age})   9.       <!-- 这里sql结尾不能加分号，否则报“ORA-00911”的错误 -->   10.    </insert>   11.   12.    <!-- 这里的id必须和UserMapper接口中的接口方法名相同，不然运行的时候也要报错 -->   13.    <select id="getUser" resultType="User" parameterType="java.lang.String">   14.        select * from vincent_user where name=#{name}   15.    </select>   16.</mapper>  MyBatis的配置文件这里取名为mybatis-config.xml其配置代码如下(相当与Hibernate的hibernate.cfg.xml): Xml代码 复制代码 收藏代码1.<?xml version="1.0" encoding="UTF-8"?>   2.<!DOCTYPE configuration   3.    PUBLIC "-//mybatis.org//DTD Config 3.0//EN"   4.    "http://mybatis.org/dtd/mybatis-3-config.dtd">   5.   6.<configuration>   7.    <settings>   8.        <!-- changes from the defaults for testing -->   9.        <setting name="cacheEnabled" value="http://www.mamicode.com/false" />   10.        <setting name="useGeneratedKeys" value="http://www.mamicode.com/true" />   11.        <setting name="defaultExecutorType" value="http://www.mamicode.com/REUSE" />   12.    </settings>   13.    <typeAliases>   14.       <typeAlias alias="User" type="bean.User"/>   15.    </typeAliases>   16.    <environments default="development">   17.       <environment id="development">   18.           <transactionManager type="jdbc"/>   19.           <dataSource type="POOLED">   20.              <property name="driver" value="http://www.mamicode.com/oracle.jdbc.driver.OracleDriver"/>   21.              <property name="url" value="http://www.mamicode.com/jdbc:oracle:thin:@192.168.56.201:1521:system"/>   22.              <property name="username" value="http://www.mamicode.com/vincent"/>   23.              <property name="password" value="http://www.mamicode.com/1234"/>   24.           </dataSource>   25.       </environment>   26.    </environments>   27.    <mappers>   28.        <mapper resource="resource/UserMapper.xml" />   29.    </mappers>   30.</configuration>  加载配置文件得到sqlSessionFactory的工具类 Java代码 复制代码 收藏代码1.package Util;   2.   3.import java.io.IOException;   4.import java.io.Reader;   5.   6.import org.apache.ibatis.io.Resources;   7.import org.apache.ibatis.session.SqlSessionFactory;   8.import org.apache.ibatis.session.SqlSessionFactoryBuilder;   9.   10.public class MyBatisUtil  {   11.    private  final static SqlSessionFactory sqlSessionFactory;   12.    static {   13.       String resource = "resource/mybatis-config.xml";   14.       Reader reader = null;   15.       try {   16.           reader = Resources.getResourceAsReader(resource);   17.       } catch (IOException e) {   18.           System.out.println(e.getMessage());   19.   20.       }   21.       sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);   22.    }   23.   24.    public static SqlSessionFactory getSqlSessionFactory() {   25.       return sqlSessionFactory;   26.    }   27.}  测试代码如下： Java代码 复制代码 收藏代码1.package TestMapper;   2.import org.apache.ibatis.session.SqlSession;   3.import org.apache.ibatis.session.SqlSessionFactory;   4.import org.junit.Test;   5.   6.public class TestMapper {   7.    static SqlSessionFactory sqlSessionFactory = null;   8.    static {   9.       sqlSessionFactory = MyBatisUtil.getSqlSessionFactory();   10.    }   11.   12.    @Test   13.    public void testAdd() {   14.       SqlSession sqlSession = sqlSessionFactory.openSession();   15.       try {   16.           UserMapper userMapper = sqlSession.getMapper(UserMapper.class);   17.           User user = new User("tom",new Integer(5));   18.           userMapper.insertUser(user);   19.           sqlSession.commit();//这里一定要提交，不然数据进不去数据库中   20.       } finally {   21.           sqlSession.close();   22.       }   23.    }   24.   25.    @Test   26.    public void getUser() {   27.       SqlSession sqlSession = sqlSessionFactory.openSession();   28.       try {   29.           UserMapper userMapper = sqlSession.getMapper(UserMapper.class);   30.           User user = userMapper.getUser("jun");   31.           System.out.println("name: "+user.getName()+"|age: "+user.getAge());   32.       } finally {   33.           sqlSession.close();   34.       }   35.    }   36.   37.}