AOP 学习, 抛出通知

抛出通知
    org.springframework.aop.ThrowsAdvice;

   抛出通知跟后置通知一样是在连接点只后运行的，不过抛出通知只在方法抛出一个异常时才执行，该通知对程序运行不能做任何改变， 能做的只是改变抛出异常的类型

 

public class ErrorClass {
	
	public void error1() throws Exception{
		throw new Exception("Foo");
	}
	public void error2() throws IllegalArgumentException{
		throw new IllegalArgumentException("Foo");
	}

  }
  

  

   import org.springframework.aop.ThrowsAdvice;
   import org.springframework.aop.ThrowsAdvice;

public class MyThrowsAdvice implements ThrowsAdvice {
	
	public void afterThrowing(Exception ex) throws Throwable{
		System.out.println("this is a test1");
	}
	
	public void afterThrowing(Method method,Object[] args,Object target,IllegalArgumentException ex) throws Throwable{
		System.out.println("this is a test2");
	}

   }
   

  

   import org.springframework.aop.framework.ProxyFactory;
   importorg.springframework.aop.support.NameMatchMethodPointcutAdvisor;


public class test2 {

	public static void main(String[] args) {
		
                  ErrorClass target =new ErrorClass();
		
		ProxyFactory pf=new ProxyFactory(target);
		
		pf.addAdvice(new MyThrowsAdvice()); 
		
		ErrorClass ebean=(ErrorClass)pf.getProxy();
		
		try{
			ebean.error1();
		}catch(Exception ignored){
			
		}
		
		try{
			ebean.error2();
		}catch(Exception ignored){
			
		}
	}

   }
   

   对于抛出的每一个异常，SPRING只会运行一个afterThrowing()方法， SPRING会选择签名与抛出的异常最匹配的一个方法
  

   this is a test1
   this is a test2