眾所周知，Mybatis是一個JAVA輕量級（相對於Hibernate與）的資料庫處理框架,支援xml對映檔案、動態SQL。對於習慣了寫複雜SQL語句的開發人員來說，是非常方便的，他摒除了jdbc的冗長寫法，極大地減少了程式碼行數。不同於Hibernate繁瑣的配置，Mybatis的整合是非常容易的。
1.新建新建實體類：

public Class User{
        public String user_id;
        public String user_name;
}

2.新建對映介面:com.company.mapInterface.UserMapper

public
 
 interface UserMapper {
     public User findByUserId(String userId);  
}

3.新建xml對映檔案com/company/mappers/UserMapping.xml,內容如下:

<?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">  
<!--這塊等於dao介面的實現 namespace必須和介面的類路徑一樣-->
 
  
<mapper namespace="com.company.mapInterface.UserMapper">  
 <!-- findByUserId必須和介面中的方法名一樣 返回一個User就是剛才的別名-->  
 <select id="findByUserId" parameterType="HashMap" resultType="User">  
    select * from user_data where user_id=#{userId}  
    </select>  
</mapper>  

4.在com.company.config下新建batis配置檔案mybatis.xml,內容如下：

<?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>
    <typeAliases>
        <!—作用：該包下所有實體類自動使用別名 -->
        <package name="com.company.bean"/>
    </typeAliases>
    <!--資料來源配置 使用mysql資料庫 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="jdbc" />
            <dataSource type="POOLED">
            <!--Mysql寫法-->
                <!-- <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis" /> -->
                <!--Oracle寫法-->
                 <property name="driver" value="oracle.jdbc.OracleDriver"></property>
                 <property name=" url"value="jdbc:oracle:thin:@XXX"></property>
                <!--賬號/密碼-->
                <property name="username" value="test" />
                <property name="password" value="psw" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--userMapper.xml裝載進來 同等於把“dao”的實現裝載進來 -->
        <mapper resource="com/company/mappers/UserMapping.xml" />
    </mappers>
</configuration>  

其中dataSource 的配置也可以使用佔位符，如下：

<?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>
    <typeAliases>
        <!—作用：該包下所有實體類自動使用別名 -->
        <package name="com.company.bean"/>
    </typeAliases>
    <properties resource="org/mybatis/example/config.properties">
     <property name="driver" value="oracle.jdbc.OracleDriver"/>
      <property name="url" value="jdbc:oracle:thin:@XXX"/>
      <property name="username" value="test"/>
      <property name="password" value="psw"/>
    </properties>
    <!--資料來源配置 使用mysql資料庫 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="jdbc" />
            <dataSource type="POOLED">
                <!--Oracle寫法-->
                <property name="driver" value="${driver}"></property>
                <property name="url" value="${url}"></property>
                <!--賬號/密碼-->
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--userMapper.xml裝載進來 同等於把“dao”的實現裝載進來 -->
        <mapper resource="com/company/mappers/UserMapping.xml" />
    </mappers>
</configuration> 

還可以使用配置檔案，如下：

<?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>
    <typeAliases>
        <!—作用：該包下所有實體類自動使用別名 -->
        <package name="com.company.bean"/>
    </typeAliases>
    <properties resource="jdbc.properties"></properties>
    <!--資料來源配置 使用mysql資料庫 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="jdbc" />
            <dataSource type="POOLED">
            <!--Mysql寫法-->
                <!-- <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis" /> -->
                <!--Oracle寫法-->
                 <property name="driver" value="${driver}"></property>
                 <property name="url" value="${url}"></property>
                <!--賬號/密碼-->
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--userMapper.xml裝載進來 同等於把“dao”的實現裝載進來 -->
        <mapper resource="com/company/mappers/UserMapping.xml" />
    </mappers>
</configuration> 

然後同路徑下新建jdbc.properties檔案

driver=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@XXX
username=test
password=psw

5.最後一步，測試:
(1)新建工具類:

public class BatisUtil {

    public static SqlSessionFactory getSessionFactory() {  
      SqlSessionFactory sessionFactory = null;  
      String resource = "com/company/config/mybatis.xml";  
      try {  
       sessionFactory = new SqlSessionFactoryBuilder().build(Resources  
         .getResourceAsReader(resource));  
      } catch (IOException e) {  
       // TODO Auto-generated catch block  
       e.printStackTrace();  
      }  
      return sessionFactory;  

(2)新建測試類:

public class MyBatisTest {
     public static void main(String[] args) {  
          SqlSession sqlSession = BatisUtil.getSessionFactory().openSession();  
          UserMapper userMapper = sqlSession.getMapper(UserMapper.class);  

          User user = userMapper.findByUserId("1455");  
          System.out.println(user.user_name);  
     }  
}

執行,正確打印出資料庫中的user_name值，完成。