第十一讲 使用注解开发

一、spring配置文件（applicationContext.xml）：

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:tx="http://www.springframework.org/schema/tx"

     xmlns:aop="http://www.springframework.org/schema/aop"

     xmlns:context="http://www.springframework.org/schema/context"

     xsi:schemaLocation="http://www.springframework.org/schema/beans

     http://www.springframework.org/schema/beans/spring-beans.xsd

     http://www.springframework.org/schema/tx

     http://www.springframework.org/schema/tx/spring-tx.xsd

     http://www.springframework.org/schema/aop

     http://www.springframework.org/schema/aop/spring-aop.xsd

     http://www.springframework.org/schema/context

     http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 配置数据源 -->

     <beanid="dataSource"

          class="org.springframework.jdbc.datasource.DriverManagerDataSource">

           <propertyname="driverClassName"value="com.mysql.jdbc.Driver"></property>

           <propertyname="url"value="jdbc:mysql://localhost:3306/test"></property>

           <propertyname="username"value="root"></property>

           <propertyname="password"value="123456"></property>

     </bean>

     <!-- 声明式事务配置 -->

     <!-- 配置事务管理器 -->

     <beanid="txManager"

          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

           <propertyname="dataSource"ref="dataSource"/>

     </bean>

     <!-- 配置事务通知 -->

     <tx:adviceid="txAdvice"transaction-manager="txManager">

           <tx:attributes>

                <!-- 配置哪些方法使用什么样的事务，配置事务的传播特性 -->

                <tx:methodname="add"propagation="REQUIRED"/>

                <tx:methodname="insert"propagation="REQUIRED"/>

                <tx:methodname="update"propagation="REQUIRED"/>

                <tx:methodname="delete"propagation="REQUIRED"/>

                <tx:methodname="remove*"propagation="REQUIRED"/>

                <tx:methodname="get"read-only="true"/>

                <tx:methodname="*"propagation="REQUIRED"/>

           </tx:attributes>

     </tx:advice>

     <aop:config>

           <!-- 切入点应该是service.impl下的所有类的所有方法，这里为了方便测试所以直接用了dao.impl -->

           <aop:pointcutexpression="execution(* com.liujie.dao.impl.*.*(..))"

                id="pointcut"/>

           <aop:advisoradvice-ref="txAdvice"pointcut-ref="pointcut"/>

     </aop:config>

     <!-- 声明式事务配置结束 -->

     <!-- 配置sqlSessionFactory -->

     <beanid="sqlSessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean">

           <propertyname="dataSource"ref="dataSource"></property>

           <propertyname="configLocation"value="classpath:mybatis-config.xml"></property>

     </bean>

     <!-- 自动扫描所配置包下的所有注解

           dao：@Repository("userDao")

           service：@Service("userService")

           action：@Controller("userAction") @Scope("prototype")

           属性的注入：@Autowired

      -->

     <context:component-scanbase-package="com.liujie"></context:component-scan>

</beans>

二、spring注解：

     UserDaoImpl.java：

@Repository("userDao")

publicclass UserDaoImpl extendsSqlSessionDaoSupport implements UserDao {

     @Autowired

     @Override

     publicvoid setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {

           super.setSqlSessionFactory(sqlSessionFactory);

     }

     

     publicList<User> getAll() {

           returnthis.getSqlSession().selectList("com.liujie.model.UserMapper.getAll");

     }

}

     <beanid="userDao"class="com.liujie.dao.impl.UserDaoImpl">

           <propertyname="sqlSessionFactory"ref="sqlSessionFactory"></property>

     </bean>

@Repository("userDao")，相当于是创建一个id="userDao"的bean；@Autowired，可以写在要注入的属性上面，也可以写在要注入

的属性的setter方法上面，注入的值是id=属性名的bean。

     UserServiceImpl.java：

@Service("userService")

publicclass UserServiceImpl implementsUserService {

     @Autowired

     privateUserDao userDao;

     

     publicvoid setUserDao(UserDao userDao) {

           this.userDao= userDao;

     }

     

     publicList<User> getAll() {

           returnuserDao.getAll();

     }

}

   为什么上面UserDaoImpl.java里面，@Repository("userDao")中一定要写"userDao"呢？

   因为这里要注入UserDao的属性名为userDao，如果UserDaoImpl.java里面直接写@Repository，默认创建的bean的

   id=类名（userDaoImpl），所以要么在UserDaoImpl.java里面写@Repository("userDao")，要么把这里privateUserDaouserDao改

   写为privateUserDaouserDaoImpl。

     UserAction.java：

@Controller("userAction")

@Scope("prototype")

publicclass UserAction {

     privateList<User> list;

     

     @Autowired

     privateUserService userService;

     

     publicvoid setUserService(UserService userService) {

           this.userService= userService;

     }

     

     publicList<User> getList() {

           returnlist;

     }

     

     publicvoid setList(List<User> list) {

           this.list= list;

     }

     

     publicString list() {

           list= userService.getAll();

           return"success";

     }

     

}

三、总结：

     <beanid="userDao"class="com.liujie.dao.impl.UserDaoImpl">

           <propertyname="sqlSessionFactory"ref="sqlSessionFactory"></property>

     </bean>

     

     <beanid="userService"class="com.liujie.service.impl.UserServiceImpl">

           <propertyname="userDao"ref="userDao"></property>

     </bean>

     

     <beanid="userAction"class="com.liujie.action.UserAction"scope="prototype">

           <propertyname="userService"ref="userService"></property>

     </bean>

   其实就是用注解的方式来生成这3个bean。