MyBatis3-与Spring 4集成

继续使用前一篇的例子http://www.cnblogs.com/EasonJim/p/7052368.html，实际项目中，通常会用Spring来管理DataSource等。充分利用Spring基于接口的编程，以及AOP、IOC带来的方便。用Spring来管理MyBatis与管理Hibernate有很多类似的地方。

下面是实际整合步骤，集成最简单的Spring功能：

0、项目结构：

1、POM引入相关依赖，配置如下：

        <!-- Spring Core -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

        <!-- Spring Context -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

        <!-- Spring JDBC -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

        <!-- mysql-connector-java -->
        <!-- http://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

        <!-- mybatis -->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.4</version>
        </dependency>

        <!-- mybatis-spring -->
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- commons-dbcp -->
        <!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

2、配置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">

    <!--采用DBCP连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/Test?serverTimezone=UTC" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>
    
    <!-- 新建SessionFactonry -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--dataSource属性指定要用到的连接池 -->
        <property name="dataSource" ref="dataSource" />
        <!--configLocation属性指定mybatis的核心配置文件 -->
        <property name="configLocation" value="Configuration.xml" />
    </bean>

    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <!--sqlSessionFactory属性指定要用到的SqlSessionFactory实例 -->
        <property name="sqlSessionFactory" ref="sqlSessionFactory" />
        <!--mapperInterface属性指定映射器接口，用于实现此接口并生成映射器对象 -->
        <property name="mapperInterface" value="com.jsoft.testmybatis.inter.IUserOperation" />
    </bean>

</beans>

org.mybatis.spring.SqlSessionFactoryBean与org.mybatis.spring.mapper.MapperFactoryBean实现了Spring的接口，并产生beans对象。

3、去除之前在Configuration.xml配置的数据库连接信息，改成如下配置：

<?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>
        <typeAlias alias="User" type="com.jsoft.testmybatis.models.User" />
        <typeAlias alias="Article" type="com.jsoft.testmybatis.models.Article" />
    </typeAliases>

    <mappers>
        <mapper resource="com/jsoft/testmybatis/models/User.xml" />
    </mappers>
    
</configuration>

4、最后是测试代码的核心部分，完全去除了MyBatis新建SessionFactory的部分，代码如下所示：

        ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

        IUserOperation mapper = (IUserOperation) ctx.getBean("userMapper");
        // 测试id=1的用户查询，根据数据库中的情况，可以改成你自己的.
        System.out.println("得到用户id=1的用户信息");
        User user = mapper.selectUserByID(1);
        System.out.println(user.getUserAddress());

        // 得到文章列表测试
        System.out.println("得到用户id为1的所有文章列表");
        List<Article> articles = mapper.getUserArticles(1);

        for (Article article : articles) {
            System.out.println(article.getContent() + "--" + article.getTitle());
        }

5、测试结果：

可以看出，效果和没有和Spring整合时基本一致。只是代码上简化了操作。

测试工程：https://github.com/easonjim/5_java_example/tree/master/mybatis/test5

参考：

http://www.yihaomen.com/article/java/309.htm