Peak Spring4 Learning (6) Application examples of spring AOP

I. Introduction of AOP:

Ii. Examples of AOP:

Iii. Examples of Use

Requirements: Before and after student added, print the log information;

0) Spring AOP needs to refer to the jar package:

1) Studentservice.java Interface:

 Package Com.cy.service;  Public Interface Studentservice {    publicvoid  addstudent (String name);}

View Code

2) Studentserviceimpl.java Implementation class:

 Package Com.cy.service.impl; Import Com.cy.service.StudentService;  Public class Implements Studentservice {    @Override    publicvoid  addstudent (String name) {        System.out.println ("add student" +name);}    }

View Code

3) Studentserviceaspect.java Slice class:

 PackageCom.cy.advice;ImportOrg.aspectj.lang.JoinPoint;ImportOrg.aspectj.lang.ProceedingJoinPoint; Public classStudentserviceaspect {//pre-notification, before method execution     Public voidDobefore (joinpoint JP) {System.out.println ("Class Name:" +jp.gettarget (). GetClass (). GetName ()); System.out.println ("Method Name:" +jp.getsignature (). GetName ()); System.out.println ("Start adding students:" + Jp.getargs () [0]); }        //After the post-notification method is complete     Public voidDoafter (joinpoint JP) {System.out.println ("Class Name:" +jp.gettarget (). GetClass (). GetName ()); System.out.println ("Method Name:" +jp.getsignature (). GetName ()); System.out.println ("Complete Add Student:" + Jp.getargs () [0]); }        //Surround notifications can add logic before and after business methods     PublicObject Doaround (Proceedingjoinpoint PJP)throwsthrowable{System.out.println ("Before adding students"); Object RetVal= Pjp.proceed ();//retval is the return value of the studentserviceimpl.addstudent (String name) method // because the return value is void, the console prints null System.out.println ("After adding students");        System.out.println (RetVal); returnRetVal; }        //Back to Notifications     Public voiddoafterreturning (joinpoint JP) {System.out.println ("Return Notification"); }        //Exception Notification     Public voiddoafterthrowing (joinpoint JP, Throwable ex) {System.out.println ("Exception Notification"); System.out.println ("Exception Info:" +ex.getmessage ()); }}

4) beans.xml configuration:

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"xsi:schemalocation= "Http://www.springframework.org/schema/beans Http://www.springframework.org/schema/beans/spring-bean S.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/a Op/spring-aop-2.5.xsd ">          <BeanID= "Studentservice"class= "Com.cy.service.impl.StudentServiceImpl"></Bean>     <BeanID= "Studentserviceaspect"class= "Com.cy.advice.StudentServiceAspect"></Bean>          <Aop:config>         <Aop:aspectID= "Studentserviceaspect"ref= "Studentserviceaspect">             <Aop:pointcutexpression= "Execution (* com.cy.service). *.*(..))"ID= "Businessservice"/>             <Aop:beforeMethod= "Dobefore"Pointcut-ref= "Businessservice"/>             <Aop:afterMethod= "Doafter"Pointcut-ref= "Businessservice"/>             <Aop:aroundMethod= "Doaround"Pointcut-ref= "Businessservice"/>             <aop:after-returningMethod= "Doafterreturning"Pointcut-ref= "Businessservice"/>             <aop:after-throwingMethod= "Doafterthrowing"Pointcut-ref= "Businessservice"throwing= "Ex"/>         </Aop:aspect>     </Aop:config>     </Beans>

5) Test Code:

 Public class T {        publicstaticvoid  main (string[] args) {        new Classpathxmlapplicationcontext ("Beans.xml");         = (Studentservice) ac.getbean ("Studentservice");        Studentservice.addstudent ("Zhang San");    }    }

View Code

1) No exception is thrown, no exception notification; console print:

2) The Addstudent method constructs the exception, has the exception notification, the console prints:

Studentserviceimpl.java:

 Package Com.cy.service.impl; Import Com.cy.service.StudentService;  Public class Implements Studentservice {    @Override    publicvoid  addstudent (String name) {        System.out.println ("add student" +name);        System.out.println (1/0);    }}

View Code

The exception that is thrown in the Doaround method is this sentence:

--Object RetVal = Pjp.proceed ();

Peak Spring4 Learning (6) Examples of spring AOP applications