Spring的通知(Advice)

时间:2024-01-10 21:26:56

  Spring提供了5种Advice类型:

  Interception Around:JointPoint前后调用

  Before:JointPoint前调用

  After Returning:JointPoint后调用

  Throw:JoinPoint抛出异常时调用

  Introduction:JointPoint调用完毕后调用

Interception Around通知

  Interception Around通知会在JoinPoint的前后执行。实现此通知的类需要实现接口MethodInterceptor,示例代码如下:

 public class LogInterceptor implements MethodInterceptor{
public Object invoke(MethodInvocation invocation invocation) throws Throwable{
System.out.println("开始审核数据...");
Object rval = invocation.proceed();
System.out.println("审核数据结束...");
return rval;
}
}

Before通知

只在JointPoint前执行,实现Before通知的类需要实现接口MethodBeforeAdvice,示例带入如下:


1 public class LogBeforeAdvice implements MethodBeforeAdvice{
2 public void before(Method m,Object[] args,Object target) throw Throwable{
3 System.out.println("开始审核数据...");
4 }
5 }

After Returning通知

  只在JointPoint之后执行,实现After Returning通知的类需要实现接口AfterReturningAdvice,示例代码如下:

 

 public class LogAfterAdvice implements AfterReturningAdvice{
public void afterReturning(Method m,Object[] args,Object target) throws Throwable{
System.out.println(“审核数据结束...”);
}
}

Throw通知

    只在JointPoint抛出异常时执行,实现Throw通知的类需要实现接口ThrowsAdvice,示例代码如下:

 public class LogThrowAdvice implements ThrowsAdvice{
public void afterThrowing(RemoteException ex) throws Throwable{
System.out.println("审核数据异常,请检查..."+ex);
}
}

Introduction通知

  只在JointPoint调用完毕后执行,实现Introduction通知的类需要实现接口IntroductionAdvisor和接口IntroductionInterceptor