spring与mybatis的整合

整合需要的jar包

要实现spring与mybatis的整合，就要首先导入相关的依赖jar包，如下：

• • 　　Spring的jar包
  • 　　Mybatis的jar包
  • 　　Spring与mybatis整合的jar包
  • 　　Mysql数据库驱动的jar包
  • 　　Druid数据库连接池的jar包
  • 　　Spring与Junit集成测试的jar包(spring-test、Junit)
  • 　　日志的jar包

    　　具体依赖

    <properties>
          <spring-version>4.2.4.RELEASE</spring-version>
      </properties>
      
      <dependencies>
          <!-- spring 核心 -->
          <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring-version}</version>
        </dependency>
        
        <!-- spring web集成 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        
        <!-- spring aop的jar包 -->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring-version}</version>
        </dependency>
        
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
          
          <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
          
         <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring-version}</version>
        </dependency>
          
          <!-- spring jdbc jar包 -->
              <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring-version}</version>
        </dependency>
          
          <!-- mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <!-- 事务 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring-version}</version>
        </dependency>
        
        <!-- druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>
          
          <!-- mybaties的依赖包 -->
          <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.7</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>
        <!-- 日志相关的jar包 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.13</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>
      
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
        </dependency>
        
        <!-- spring与Junit测试的jar包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring-version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.9</version>
            <scope>test</scope>
        </dependency>
              
      </dependencies>
      
      <build>  
        <plugins>  
            <plugin>  
                <groupId>org.apache.maven.plugins</groupId>  
                <artifactId>maven-compiler-plugin</artifactId>  
                <configuration>  
                    <source>1.7</source>
                    <target>1.7</target>  
                </configuration>  
            </plugin>  
            <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                    <configuration>
                        <!-- 指定端口 -->
                        <port>8080</port>
                        <!-- 请求路径 -->
                        <path>/</path>
                    </configuration>
                </plugin>
            
        </plugins>  
    </build>

    整合的步骤

    　　第一步：创建maven的web工程

    　　第二步：导入整合需要的jar包

    　

    　　第三步：mybatis的核心配置文件：sqlMapConfig.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>
         <!-- 定义别名 -->
         <typeAliases>
             <package name="cn.itcast.spring.domain"/>
         </typeAliases>
         <!-- 加载映射文件 -->    
         <mappers>
             <mapper resource="mapper.xml"/>
         </mappers>
     </configuration>    

    　　第四步：spring的核心配置文件：applicationContext.xml的配置

    • 　　　　加载db.properties属性配置文件
    • 　　　　配置Druid数据库连接池
    • 　　　　将SqlSessionFactory的单例对象，配置到spring容器中
    • 　　　　将mapper代理对象或者dao接口的实现类对象，配置到spring容器中

    <?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"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">            
        <context:component-scan base-package="cn.spring"></context:component-scan>
        
        <!-- 加载db.properties属性文件 -->
        <context:property-placeholder location="classpath:db.properties"/>
        
        <!-- 数据库连接池 -->
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driverClassName}"></property>
            <property name="url" value="${jdbc.url}"></property>
            <property name="username" value="${jdbc.username}"></property>
            <property name="password" value="${jdbc.password}"></property>
        </bean>
        
        <!-- SQLSessionFactory的配置 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"></property>        
            <!-- mybatis的核心配置文件的路径 -->
            <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
        </bean>       
    </beans>

    　　　　　　至于将mapper代理对象或者dao接口的实现类对象，配置到spring容器中，将在下面进行配置

    　　第五步：编写dao接口、dao实现类或者mapper接口、mapper映射文件

     传统Dao开发方式

    　　开发方式：dao接口+dao实现类。

    　　Dao的实现类需要从spring容器中获取sqlSession对象来操作数据库，spring为我们提供了SqlsessionDaoSupport类，我们只需要继承这个类，就可以顺利的获得sqlSession对象。

    总结一句话：dao实现类需要继承SqlsessionDaoSupport类，然后再spring容器中配置这个bean。

    1 public interface AccountDao {
    2     public List<Account> findAll();
    3 }

     1 public class AccountDaoImpl extends SqlSessionDaoSupport implements AccountDao {//需要继承SqlSessionDaoSupport 
     2     @Override
     3     public List<Account> findAll() {
     4         SqlSession sqlSession = getSqlSession();    //继承SqlSessionDaoSupport 后直接调用getSqlSession方法
     5         List<Account> selectList = sqlSession.selectList("test.abc");
     6         //整合后sqlSession不需要关闭
     7         return selectList;
     8     }
     9 
    10 }

    　　　　　　mapper.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="test">
        <select id="abc" resultType="account">
            select * from account
        </select>
    </mapper>

    　　　　　　applicationContext.xml中配置dao

    　　 <!-- dao的实现类放到容器中（spring与mybatis整合传统dao的开发） -->
        <bean id="accountDao" class="cn.itcast.spring.dao.AccountDaoImpl">
            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
        </bean>

    　　　　　　基于mapper代理形式开发Dao

    　　　　　　　　　　开发mapper接口及mapper映射文件

    1 public interface AccountMapper {
    2     public List<Account> selectAll();
    3 }

    <?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代理的开发规则：
    　　　　1.namespace必须为接口的全路径
    　　　　2.id必须和接口的方法名称一致
    　　　　3.parameterType必须与接口方法的参数类型一致
    　　　　4.resultType必须与接口方法的返回值类型一致
     -->
    
    <mapper namespace="cn.itcast.spring.mapper.AccountMapper">
        <select id="selectAll" resultType="account">
            select * from account
        </select>
    </mapper>

    　　　　　　　　　　applicationContext.xml中配置mapper代理

    　　 <!-- 包扫描器 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 扫描包,mapper接口和映射对象的名称必须保持一致 -->
            <property name="basePackage" value="cn.spring.mapper"></property>
        </bean>

    　　第六步：编写Junit测试代码测试

    　　　　　　传统dao方式开发测试

     1 @RunWith(SpringJUnit4ClassRunner.class)
     2 @ContextConfiguration("classpath:applicationContext.xml")
     3 public class SpringMybatisTest {
     4     @Autowired
     5     private AccountDao accountDao;
     6     
     7     @Test
     8     public void testName() throws Exception {
     9         List<Account> findAll = accountDao.findAll();        
    10         for (Account account : findAll) {
    11             System.out.println(account);
    12         }
    13     }
    14 }

    　　　　　　基于mapper代理方式测试

     1 @RunWith(SpringJUnit4ClassRunner.class)
     2 @ContextConfiguration("classpath:applicationContext.xml")
     3 public class SpringMybatisTest {
     4     @Autowired
     5     private AccountMapper accountMapper;
     6     
     7     @Test
     8     public void testName() throws Exception {
     9         List<Account> list = accountMapper.selectAll();        
    10         for (Account account : list) {
    11             System.out.println(account);
    12         }
    13     }
    14 }