1.上節我們談到攔截器起作用時，實現代碼（ReflectiveMethodInvocation.java）如下：

public Object proceed() throws Throwable {// We start with an index of -1 and increment early.if (this.currentInterceptorIndex == this.interceptorsAndDynamicMethodMatchers.size() - 1) {return invokeJoinpoint();}Object interceptorOrInterceptionAdvice =this.interceptorsAndDynamicMethodMatchers.get(++this.currentInterceptorIndex);if (interceptorOrInterceptionAdvice instanceof InterceptorAndDynamicMethodMatcher) {// Evaluate dynamic method matcher here: static part will already have// been evaluated and found to match.InterceptorAndDynamicMethodMatcher dm =(InterceptorAndDynamicMethodMatcher) interceptorOrInterceptionAdvice;if (dm.methodMatcher.matches(this.method, this.targetClass, this.arguments)) {return dm.interceptor.invoke(this);}else {// Dynamic matching failed.// Skip this interceptor and invoke the next in the chain.return proceed();}}else {// It's an interceptor, so we just invoke it: The pointcut will have// been evaluated statically before this object was constructed. return ((MethodInterceptor) interceptorOrInterceptionAdvice).invoke(this);}}

2.前置Advice MethodBeforeAdviceInterceptor.java

public Object invoke(MethodInvocation mi) throws Throwable {this.advice.before(mi.getMethod(), mi.getArguments(), mi.getThis() );return mi.proceed();}

3.后置Advice AfterReturningAdviceInterceptor.java

public Object invoke(MethodInvocation mi) throws Throwable {Object retVal = mi.proceed();this.advice.afterReturning(retVal, mi.getMethod(), mi.getArguments(), mi.getThis());return retVal;}

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轉載于:https://www.cnblogs.com/davidwang456/archive/2013/03/19/2969479.html

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