Various notifications in Spring

1 <?XML version= "1.0" encoding= "UTF-8"?>2 <Beansxmlns= "Http://www.springframework.org/schema/beans"3 XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"4 Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"5 xsi:schemalocation= "Http://www.springframework.org/schema/beans6 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd7 HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP8 http://www.springframework.org/schema/aop/spring-aop-2.5.xsd ">9 <!-- Ten 1. Introduction of AOP namespaces One xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP" A HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP - http://www.springframework.org/schema/aop/spring-aop-2.5.xsd - 2. Target class the 3. Facets - 4. The interceptor is implemented within spring - 5, the configuration of AOP -       - + <BeanID= "Persondao"class= "Cn.test.aop.PersonDaoImpl"></Bean> - <BeanID= "Transaction"class= "Cn.test.aop.Transaction"></Bean> +  A <!--AOP Configuration - at <Aop:config> -     <!--pointcut Expression - expression - determine which class can generate a proxy object - ID Unique identification - -     <Aop:pointcutexpression= "Execution (* cn.test.aop.persondaoimpl.* (..))"ID= "perform"/> in     <!--Facets - -     <Aop:aspectref= "Transaction"> to         <!--front-facing notifications + * Before the target method is executed -                - the         <Aop:beforeMethod= "BeginTransaction"Pointcut-ref= "perform"/> *         <!--Post Notification $ * After the target method is executedPanax Notoginseng * The return value of the target method can be obtained according to returning - * If the target method encounters an exception, the notification does not execute the                - +         <aop:after-returningMethod= "Commit"Pointcut-ref= "perform"returning= "Val"/> A         <!--pre-and post-notifications can only add content to the target method, but cannot control the execution of the target method - the         <!--  + Final Notice - * After the target method is executed $ * Regardless of whether the target method encounters an exception, execute $ * Often do some close resources -          -          -         <Aop:afterMethod= "Finallymethod"Pointcut-ref= "perform"/>  the         <!--  - Exception NotificationWuyi The goal is to get the exception thrown by the target method. the          - -         <aop:after-throwingMethod= "Exceptionmethod"throwing= "Ex"Pointcut-ref= "perform"/> Wu          -     </Aop:aspect> About </Aop:config> $  -  - </Beans>

  Transaction.java
1 Public class Transaction {2 //joinpoint connection Point information3 Public void BeginTransaction (Joinpoint joinpoint) {4 Joinpoint.getargs ();//Gets the parameter of the method5 String methodName = Joinpoint.getsignature (). GetName ();6 System.out.println (methodName);7 System.err.println ("Begin trans Action");8     }9 Public Void Commit (Joinpoint joinpoint,object val) {Ten System.err.println ("commit"); One     } A      - Public void Finallymethod () { - System.err.println ("finally Method"); the     } -      - Public void Exceptionmethod (Throwable ex) { - System.err.println (Ex.getmessage ()); +     } -      +     /** A * Surround Notifications at * Ability to control the execution of target methods -      */ -      - Public void Aroundmethod (Proceedingjoinpoint joinpoint) { - String methodname=joinpoint.getsignature (). GetName (); - if ("Addperson". Equals (MethodName)) { in              -         } to}

Test:

1 /**2 * Principle3 * * Load config file, start spring container4 * * Spring container creates objects for bean5 * * Parsing the configuration of AOP, parsing pointcut expressions6 * * See the class that incorporates spring management and pointcut expression matches, and if it does, creates a proxy object for that class7 * * Proxy object Method body formation is the target method + notification8 * * When the client is in Context.getbean, if the bean has a proxy object, the proxy object is returned and the original object is returned if there is no proxy object9 * Description:Ten * If the target class implements an interface, the spring container takes jdkproxy, and if the target class does not implement an interface, the Spring container takes One * Cglibproxy A      *       -      *      */ - @Test the      Public voidDosome () { -          -ApplicationContext applicationcontext=NewClasspathxmlapplicationcontext ("Cn/test/aop/applicationcontext.xml"); -Persondao persondao= (Persondao) Applicationcontext.getbean ("Persondao"); +  - Persondao.addperson (); +          A}

Various notifications in Spring