1.AOP注解形式
- 声明GoodsDao接口和GoodsDaoImpl实现类:
//接口
package com.itlike.demo1;
public interface GoodsDao {
public void save();
}
//实现类
package com.itlike.demo1;
public class GoodsDaoImpl implements GoodsDao {
@Override
public void save() {
System.out.println("保存操作");
}
}
- 编写切面类:
package com.itlike.demo1;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class GoodsDaoAspect {
/*这里可以使用 GoodsDaoImpl.*(..)表示配置所有方法的切入点 */
@Before(value = "execution(* com.itlike.demo1.GoodsDaoImpl.save(..))")
public void log(){
System.out.println("日志记录");
}
}
- 配置文件:
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--AOP开启注解-->
<aop:aspectj-autoproxy/>
<!--使用AOP注解需要托管的类-->
<bean id="goodsDao" class="com.itlike.demo1.GoodsDaoImpl"/>
<bean id="goodsDaoAspect" class="com.itlike.demo1.GoodsDaoAspect"/>
</beans>
- 编写测试类:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class GoodsTest {
@Resource(name="goodsDao")
private GoodsDao goodsDao;
@Test
public void test(){
/*这里可以调用goodsDao对象的多个方法,如果切面类配置了所有方法,则所有的方法都会被代理*/
goodsDao.save();
}
}
//日志记录
//保存操作
2.通知类型注解形式
- @Before前置通知 如上,也如下:
- @AfterReturning后置通知
没有返回值
- 声明Dao接口和实现类:
//接口
public interface GoodsDao {
public void save();
}
//实现类
package com.itlike.demo1;
public class GoodsDaoImpl implements GoodsDao {
@Override
public void save() {
System.out.println("保存操作");
}
}
- 编写切面类:
@Aspect
public class GoodsDaoAspect {
@Before(value = "execution(* com.itlike.demo1.GoodsDaoImpl.save(..))")
public void log(){
System.out.println("前置通知");
}
@AfterReturning(value = "execution(* com.itlike.demo1.GoodsDaoImpl.save(..))")
public void afterreturning(){
System.out.println("后置通知");
}
}
- 配置文件:
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--AOP开启注解-->
<aop:aspectj-autoproxy/>
<bean id="goodsDao" class="com.itlike.demo1.GoodsDaoImpl"/>
<bean id="goodsDaoAspect" class="com.itlike.demo1.GoodsDaoAspect"/>
</beans>
- 测试类:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class GoodsTest {
@Resource(name="goodsDao")
private GoodsDao goodsDao;
@Test
public void test(){
goodsDao.save();
}
}
//前置通知
//保存操作
//后置通知
有返回值
5. 修改接口和类:
//接口
package com.itlike.demo1;
public interface GoodsDao {
public String save();
}
//实现类
package com.itlike.demo1;
public class GoodsDaoImpl implements GoodsDao {
@Override
public String save() {
System.out.println("保存操作");
return "success";
}
}
- 切面类:
@Aspect
public class GoodsDaoAspect {
/*有返回值时,使用returning接受,且需要在切面方法接收参数,命名一致*/
@AfterReturning(value = "execution(* com.itlike.demo1.GoodsDaoImpl.save(..))",returning = "res")
public void afterreturning(Object res){
System.out.println("后置通知"+res);
}
}
- 配置文件,测试类不变,运行结果为:
//保存操作
//后置通知success
- @Around环绕通知
- 声明Dao接口和实现类:
//接口
public interface GoodsDao {
public void delete();
}
//实现类
package com.itlike.demo1;
public class GoodsDaoImpl implements GoodsDao {
@Override
public void delete() {
System.out.println("删除操作");
}
}
- 编写切面类:
@Aspect
public class GoodsDaoAspect {
@Around(value = "execution(* com.itlike.demo1.GoodsDaoImpl.delete(..))")
public Object around(ProceedingJoinPoint joinPoint) throws Throwable{
System.out.println("环绕前通知");
Object proceed = joinPoint.proceed();
System.out.println("环绕后通知");
return proceed;
}
}
- 配置文件:
(不变)
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--AOP开启注解-->
<aop:aspectj-autoproxy/>
<bean id="goodsDao" class="com.itlike.demo1.GoodsDaoImpl"/>
<bean id="goodsDaoAspect" class="com.itlike.demo1.GoodsDaoAspect"/>
</beans>
- 测试类:
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class GoodsTest {
@Resource(name="goodsDao")
private GoodsDao goodsDao;
@Test
public void test(){
goodsDao.delete();
}
}
//环绕前通知
//删除操作
//环绕后通知
- @AfterThrowing异常抛出通知
- @After最终通知
3.定义切入点
- 有时候一个方法要添加前置通知对又要添加异常通知,又要添加最终通知
- 可以在切面当中定义好切入点
- 在通知当中直接使用定义好的切入点表达式
- 可以定义多个切入点(一个通知同时定义到多个方法当中)
4.当使用接口时与不使用接口内部代理区别
- 使用接口(JDK动态代理)
- 不使用接口(Cglib动态代理)