關於spring與mybatis的整合

                           mybatis-spring整合

導入相關的jar包

lombok//懶寫實體類
<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.8</version>
</dependency>

junit//單元測試
<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
</dependency>

mybatis
<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.5.2</version>
</dependency>

mysql-connecter-java
<dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.47</version>
</dependency>

spring相關

<dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>5.1.10.RELEASE</version>
</dependency>
<dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-jdbc</artifactId>
   <version>5.1.10.RELEASE</version>
</dependency>

AOP植入
<dependency>
   <groupId>org.aspectj</groupId>
   <artifactId>aspectjweaver</artifactId>
   <version>1.9.4</version>
</dependency>

mybatis-spring整合包
<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>2.0.2</version>
</dependency>

最後配置一下Maven靜態資源過濾
<build>
   <resources>
       <resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**/*.properties</include>
               <include>**/*.xml</include>
           </includes>
           <filtering>true</filtering>
       </resource>
   </resources>
</build>

                                 **首先回憶一下MyBatis**

1.編寫pojo實體類

//添加lombok,這些註解可以免寫實體類一些方法
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

2.編寫mybatis的配置文件mybatis-config

<?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>
        <package name="com.kuang.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
                <property name="username" value="root"/>
                <property name="password" value="zhenxin"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper class="com.kuang.mapper.UserMapper"/>
    </mappers>
</configuration>

3.接口的編寫

public interface UserMapper {
    List<User> selectUser();
}

4.對應的Mapper映射文件

<?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.kuang.mapper.UserMapper">

    <select id="selectUser" resultType="User">
        select * from user
    </select>
</mapper>

5.寫測試類

//使用單元測試
 @Test
    public void test1() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream rs = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(rs);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        for (User user : users) {
            System.out.println(user);
        }
    }

6.測試結果,mybatis環境運行成功

User(id=1, name=欣欣, pwd=xinxin)
User(id=2, name=大帥, pwd=shuai)
User(id=3, name=大帥欣, pwd=123)
User(id=4, name=老帥欣, pwd=123)
User(id=5, name=帥哥, pwd=xinxin)
User(id=6, name=帥帥欣, pwd=10086)
User(id=7, name=欣欣, pwd=xinxin)

                                 mybatis-spring的整合

1.引入Spring配置文件beans.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"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
 


</beans>

2.配置數據源代替mybatis中的數據源

<!--配置數據源：數據源有非常多，可以使用第三方的，也可使使用Spring的-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
   <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>
   <property name="username" value="root"/>
   <property name="password" value="zhenxin"/>
</bean>

3.配置SqlSessionFactory,關聯Mybatis

//利用SqlSessionFactory這個類,讀取數據源，相當於是上面mybatis搭建測試中的SqlSessionFactoryBuilder.build()那個方法

<!--配置SqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   <property name="dataSource" ref="dataSource"/>
   <!--關聯Mybatis-->
   <property name="configLocation" value="classpath:mybatis-config.xml"/>
   <property name="mapperLocations" value="classpath:com/kuang/dao/*.xml"/>
</bean>

4.註冊sqlSessionTemplate，關聯sqlSessionFactory；

//SqlSessionTemplate可以想象成一個模板,用它來創建SqlSession
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
   <!--利用構造器注入-->
   <constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>

5.增加接口的實現類,將sqlSessionTemplate私有化

//雖然多加了一個類,但是相比起來邏輯更加明確了,業務的實現都在這個類裏,更方便了管理
public class UserMapperImpl implements UserMapper {

    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        return users;
    }
}

6.在beans.xml中註冊實現

<bean id="userMapperImpl" class="com.kuang.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

7.測試

@Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserMapper userMapperImpl = context.getBean("userMapperImpl", UserMapper.class);
        List<User> users = userMapperImpl.selectUser();
        for (User user : users) {
            System.out.println(user);
        }
    }

測試結果:
User(id=1, name=欣欣, pwd=xinxin)
User(id=2, name=大帥, pwd=shuai)
User(id=3, name=大帥欣, pwd=123)
User(id=4, name=老帥欣, pwd=123)
User(id=5, name=帥哥, pwd=xinxin)
User(id=6, name=帥帥欣, pwd=10086)
User(id=7, name=欣欣, pwd=xinxin)

結果輸出成功,現在mybatis-config.xml中的配置被Spring整合

<?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>
        <package name="com.kuang.pojo"/>
    </typeAliases>

</configuration>

另外還有一種整合方式,是在上一種的整合方式上進行了簡化,

實現類繼承SqlSessionDaoSupport類,直接利用getSqlSession()方法會得到一個SqlSessionTemplate

1.重寫一個實現類UserMaperImpl2

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {
    public List<User> selectUser() {
        SqlSession sqlSession = getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        return users;
    }
}

2.增加bean的配置

<bean id="userMapperImpl2" class="com.kuang.mapper.UserMapperImpl2">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>

3.測試

  @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserMapper userMapperImpl = context.getBean("userMapperImpl2", UserMapper.class);
        List<User> users = userMapperImpl.selectUser();
        for (User user : users) {
            System.out.println(user);
        }
    }

總結:
1.在運行程序的時候,經常會遇到一些bug,比如筆者這裏經常會有報錯 3 字節的 UTF-8 序列的字節 3 無效,這個解決方法需要把一些配置文件的字符由UTF-8改爲GBK.
2.將上面mybatis 測試類裏的步驟,與spring整合的步驟對應起來,更加方便理解
3.在寫代碼的時候注意一些import類別導錯,大部分都是 ibatis 和spring下的.
感謝B站狂老師

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