從這段代碼可以看出，如果得到的攔截器鏈為空，則直接反射調用目標方法，否則創建MethodInvocation，調用其proceed方法，觸發攔截器鏈的執行，來看下具體代碼

public?Object?proceed()?throws?Throwable?{??

//??We?start?with?an?index?of?-1and?increment?early.??

if?(this.currentInterceptorIndex?==?this.interceptorsAndDynamicMethodMatchers.size()-?1)?{??

//如果Interceptor執行完了，則執行joinPoint??

return?invokeJoinpoint();??

}??

Object?interceptorOrInterceptionAdvice?=??

this.interceptorsAndDynamicMethodMatchers.get(++this.currentInterceptorIndex);??

//如果要動態匹配joinPoint??

if?(interceptorOrInterceptionAdvice?instanceof?InterceptorAndDynamicMethodMatcher){??

//?Evaluate?dynamic?method?matcher?here:?static?part?will?already?have??

//?been?evaluated?and?found?to?match.??

InterceptorAndDynamicMethodMatcher?dm?=??

(InterceptorAndDynamicMethodMatcher)interceptorOrInterceptionAdvice;??

//動態匹配：運行時參數是否滿足匹配條件??

if?(dm.methodMatcher.matches(this.method,?this.targetClass,this.arguments))?{??

//執行當前Intercetpor??

returndm.interceptor.invoke(this);??

}??

else?{??

//動態匹配失敗時,略過當前Intercetpor,調用下一個Interceptor??

return?proceed();??

}??

}??

else?{??

//?It's?an?interceptor,?so?we?just?invoke?it:?The?pointcutwill?have??

//?been?evaluated?statically?before?this?object?was?constructed.??

//執行當前Intercetpor??

return?((MethodInterceptor)?interceptorOrInterceptionAdvice).invoke(this);??

}??

} ?