第十一讲 使用注解开发

一、spring配置文件（applicationContext.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" 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 -->

     <bean id="dataSource"

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

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

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

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

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

     </bean>

     <!-- 声明式事务配置 -->

     <!-- 配置事务管理器 -->

     <bean id="txManager"

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

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

     </bean>

     <!-- 配置事务通知 -->

     <tx:advice id="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:method name="add" propagation="REQUIRED" />

                <tx:method name="insert" propagation="REQUIRED" />

                <tx:method name="update" propagation="REQUIRED" />

                <tx:method name="delete" propagation="REQUIRED" />

                <tx:method name="remove*" propagation="REQUIRED" />

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

                <tx:method name="*" 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:pointcut expression="execution(* com.liujie.dao.impl.*.*(..))"

                id="pointcut" />

           <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut" />

     </aop:config>

     <!-- 声明式事务配置结束 -->

     <!-- 配置sqlSessionFactory -->

     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

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

           <property name="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-scan base-package="com.liujie"></context:component-scan>

</beans>

二、spring注解：

     UserDaoImpl.java：

@Repository("userDao") public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {      @Autowired      @Override      public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {            super.setSqlSessionFactory(sqlSessionFactory);      }            public List<User> getAll() {            return this.getSqlSession().selectList("com.liujie.model.UserMapper.getAll");      } }

<bean id="userDao" class="com.liujie.dao.impl.UserDaoImpl">            <property name="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") public class UserServiceImpl implements UserService {      @Autowired      private UserDao userDao;            public void setUserDao(UserDao userDao) {            this.userDao = userDao;      }            public List<User> getAll() {            return userDao.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")

public class UserAction {

     private List<User> list;

     

     @Autowired

     private UserService userService;

     

     public void setUserService(UserService userService) {

           this.userService = userService;

     }

     

     public List<User> getList() {

           return list;

     }

     

     public void setList(List<User> list) {

           this.list = list;

     }

     

     public String list() {

           list = userService.getAll();

           return "success";

     }

     

}

三、总结：

<bean id="userDao" class="com.liujie.dao.impl.UserDaoImpl">            <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>      </bean>            <bean id="userService" class="com.liujie.service.impl.UserServiceImpl">            <property name="userDao" ref="userDao"></property>      </bean>            <bean id="userAction" class="com.liujie.action.UserAction" scope="prototype">            <property name="userService" ref="userService"></property>      </bean>

其实就是用注解的方式来生成这3个bean。