Spring自动代理

Spring的一般代理是通过ProxyFactoryBean织入切面代理,如果有非常多的Dao则每个Dao都需要配置ProxyFeactoryBean开发维护非常麻烦

解决方案:自动创建代理

• BeanNameAutoProxyCreator根据Bean名称创建代理
• DefaultAdvisorAutoProxyCreator根据Advisor本身包含信息创建代理
• AnnotationAwareAspectJAutoProxyCreator基于Bean中的AspectJ注解进行自动代理

对所有Dao结尾Bean所有方法切面Demo

//XML配置
<!--增强目标-->
<bean id="userDao" class="cn.akwangl.BeanNameAuto.UserDaoImpl"/>
<bean id="customerDao" class="cn.akwangl.BeanNameAuto.CustomerDao"/>

<!--Advice通知方式-->
<bean id="myBeforeAdvice" class="cn.akwangl.BeanNameAuto.MyBeforeAdvice"/>
<bean id="myAroundAdvice" class="cn.akwangl.BeanNameAuto.MyAroundAdvice" />

<!--根据Bean的名字自动创建代理-->
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
    <property name="beanNames" value="*Dao"/>
    <property name="interceptorNames" value="myBeforeAdvice"/>
</bean>

//目标对象类
public class UserDaoImpl implements UserDao {
    @Override
    public void save(User user) {System.out.println("保存用户");}
    @Override
    public void update(User user) {System.out.println("修改用户");}
    @Override
    public void findAll() {System.out.println("查询用户");}
    @Override
    public void delete(Long id) {System.out.println("删除用户");}
}

public class CustomerDao {
    public void find(){System.out.println("查询客户...");}
    public void save(){System.out.println("保存客户...");}
    public void update(){System.out.println("修改客户...");}
    public void delete(){System.out.println("删除客户...");}
}

//通知方式
//环绕通知
public class MyAroundAdvice implements MethodInterceptor {

    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        System.out.println("权限验证...");
        Object proceed = methodInvocation.proceed();
        System.out.println("日志记录...");
        return proceed;
    }
}

//前置通知
public class MyBeforeAdvice implements MethodBeforeAdvice {

    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println("权限验证...");
    }
}

//Test类
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext3.xml")
public class BeanNameAuto_Test {

    @Resource(name = "customerDao")
    private CustomerDao customerDao;


    @Resource(name = "userDao")
    private UserDao userDao;

    @Test
    public void beanNameAuto() {
        customerDao.delete();
        customerDao.find();
        customerDao.save();
        customerDao.update();
        userDao.findAll();
    }
}

//XML配置
<!--增强目标-->
<bean id="userDao" class="cn.akwangl.DefaultAdvisor.UserDaoImpl"/>
<bean id="customerDao" class="cn.akwangl.DefaultAdvisor.CustomerDao"/>

<!--Advice通知方式-->
<bean id="myBeforeAdvice" class="cn.akwangl.DefaultAdvisor.MyBeforeAdvice"/>
<bean id="myAroundAdvice" class="cn.akwangl.DefaultAdvisor.MyAroundAdvice" />

<!--配置切面-->
<bean id="myAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
    <property name="pattern" value=".*save"/>
    <property name="advice" ref="myAroundAdvice"/>
</bean>

<bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"/>

//目标类
public class UserDaoImpl implements UserDao {
    @Override
    public void save(User user) {System.out.println("保存用户");}
    @Override
    public void update(User user) {System.out.println("修改用户");}
    @Override
    public void findAll() {System.out.println("查询用户");}
    @Override
    public void delete(Long id) {System.out.println("删除用户");}
}
public class CustomerDao {
    public void find(){System.out.println("查询客户...");}
    public void save(){System.out.println("保存客户...");}
    public void update(){System.out.println("修改客户...");}
    public void delete(){System.out.println("删除客户...");}
}

//通知方式
//环绕通知
public class MyAroundAdvice implements MethodInterceptor {

    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        System.out.println("权限验证...");
        Object proceed = methodInvocation.proceed();
        System.out.println("日志记录...");
        return proceed;
    }
}

//前置通知
public class MyBeforeAdvice implements MethodBeforeAdvice {

    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println("权限验证...");
    }
}

//Test类
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext4.xml")
public class DefaultAdvisor_Test {

    @Resource(name = "customerDao")
    private CustomerDao customerDao;

    @Resource(name = "userDao")
    private UserDao userDao;

    @Test
    public void beanNameAuto() {
        customerDao.delete();
        customerDao.find();
        customerDao.save();
        customerDao.update();

        userDao.findAll();
        userDao.save(new User());
    }
}