aspect是什么意思

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**法子签字execution***execution(*com.springdemo.part1._._(..))——示意履行该包下一切类的一切法子,..示意任何参数*executionpublic*AspectDemo.*(..)——配合AspectDemo接口的一切国有法子*executionpublicdoubleAspectDemo.*(..)——配合AspectDemo中归来double品类数值的法子*executionpublicdoubleAspectDemo.*(double,..)——配合头个参数为double品类的法子,..配合肆意数肆意品类的参数*executionpublicdoubleAspectDemo.*(double,double)——配合参数品类为double,double品类的法子,Thenexttwosectionspresenttheuseofaspectsinincreasinglysophisticatedways.Developmentaspectsareeasilyremovedfromproductionbuilds.Productionaspectsareintendedtobeusedinbothdevelopmentandinproduction,buttendtoaffectonlyafewclasses.ThissectionpresentsexamplesofaspectsthatcanbeusedduringdevelopmentofJavaapplications.Theseaspectsfacilitatedebugging,testingandperformancetuningwork.Theaspectsdefinebehaviorthatrangesfromsimpletracing,toprofiling,totestingofinternalconsistencywithintheapplication.UsingAspectJmakesitpossibletocleanlymodularizethiskindoffunctionality,therebymakingitpossibletoeasilyenableanddisablethefunctionalitywhendesired.Thisfirstexampleshowshowtoincreasethevisibilityoftheinternalworkingsofaprogram.Itisasimpletracingaspectthatprintsamessageatspecifiedmethodcalls.Inourfigureeditorexample,onesuchaspectmightsimplytracewheneverpointsaredrawn.aspectSimpleTracingWhenusingthisaspect,itisimpossibleforthecompilertocompileprogramswiththeseillegalcalls.Thisearlydetectionisnotalwayspossible.Inthiscase,sincewedependonlyonstaticinformation(the`withincode`pointcutpicksoutjoinpointstotallybasedontheircode,andthe`call`pointcutherepicksoutjoinpointsstatically).Otherenforcement,suchasthepreconditionenforcement,above,doesrequiredynamicinformationsuchastheruntimevalueofparameters.Configurationmanagementforaspectscanbehandledusingavarietyofmake-fileliketechniques.Toworkwithoptionalaspects,theprogrammercansimplydefinetheirmakefilestoeitherincludetheaspectinthecalltotheAspectJcompilerornot,asdesired.DeveloperswhowanttobecertainthatnoaspectsareincludedintheproductionbuildcandosobyconfiguringtheirmakefilessothattheyuseatraditionalJavacompilerforproductionbuilds.Tomakeiteasytowritesuchmakefiles,theAspectJcompilerhasacommand-lineinterfacethatisconsistentwithordinaryJavacompilers.,1\\.说明眼下有多个可用的AOP库,这些库务须能答痴情况:*它与我现有或新的使用顺序兼容吗?*在何处得以实施AOP?*它与我的使用顺序集成的速有多快?*性能开销是若干?在正文中,咱将着眼于答这些情况,并说明SpringAOP和AspectJ(这两种最时髦的JavaAOP框架。

这些库文书在一个AspectJ设备的‘lib’目次中是可用的,如其没,你得以在Internet中下载它们。

****情况2****:AnnotationCacheAspect找不到记号****1、因:****这是鉴于AnnotationCacheAspect.aj不是java文书务必此外的aspectj进展料理,能依照如次步排速决这情况****2、速决****:下载aspectj,对应链接:装置_**_**aspectj开下令行,cd到AspectJ的jar包所在的文书夹,运转java-jaraspectj-1.9.4.jar下令,开AspectJ的装置界面,径直点击Next:

跟着选择jdk的装置途径,连续Next:

跟着选择AspectJ的装置途径,而后Install装置:

3、IDEA中布置aspectj确保如次两个插件曾经被激活SpringAOP/@AspectJAspectJSupport

4、将编译器改成Ajc,跟着设立Ajc的装置目次,选择到aspectjtools.jar,并且,必定要将DelegatetoJavac选项打钩,这代办设立的做用只对指定的项目进展Ajc编译,别的项目仍是用默认的javac编译器编译。

*pointcut:是joinpoint的聚合。

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