Spring's surround Notification

First add the jar package:

Com.springsource.net.sf.cglib-2.2.0.jar
com.springsource.org.aopalliance-1.0.0. jar
com.springsource.org.aspectj.weaver-1.6.8. Release.jar
commons-logging-1.1.3. jar
Spring-aop-4.0.0.release.jar
Spring-aspects-4.0.0.release.jar
Spring-beans-4.0.0.release.jar
Spring-context-4.0.0.release.jar
Spring-core-4.0.0.release.jar
Spring-expression-4.0.0.release. jar

Declare an interface:

 public  interface   MyMath { public  int  Add (    Span style= "COLOR: #0000ff" >int  i,int   J);  public  void  Sub (int  i,int   J);  public  void  mul (int  i,int   J);  public  void  div (int  i,int   J);}  

Creating a class implementation interface

@Component Public classMymathimplImplementsmymath{@Override Public intAddintIintj) {intresult=i+J; System.out.println ("Target method Add executed," +result); returnresult; } @Override Public voidSubintIintj) {//TODO auto-generated Method Stub        intresult=i-J; System.out.println ("The target method Sub executes," +result); } @Override Public voidMulintIintj) {//TODO auto-generated Method Stub        intresult=i*J; System.out.println ("Target method Mul executed," +result); } @Override Public voidDivintIintj) {//TODO auto-generated Method Stub        intresult=i/J; System.out.println ("The target method Div executes," +result); }}

Configuring scan packages and opening AOP annotations in Applicationcontext.xml

<?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"Xmlns:context= "Http://www.springframework.org/schema/context"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd Http://www.springframework.org/schema/context http://www.springframework.org/schema/context/ Spring-context-4.0.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/ Spring-aop-4.0.xsd ">          <!--Scan Package -     <Context:component-scanBase-package= "Com.neuedu.bean"></Context:component-scan> <!--Turn on AOP annotations -    <Aop:aspectj-autoproxy></Aop:aspectj-autoproxy></Beans>

Create slice classes that surround notifications

@Component @aspect Public classTxaspect {@Around (value= "Execution (public * com.neuedu.bean.mymathimpl.* (..))")     PublicObject Showlog (proceedingjoinpoint point) {object[] args=Point.getargs (); Object Object=NULL; Try{Object=point.proceed (args); } Catch(Throwable E1) {//TODO auto-generated Catch blockE1.printstacktrace (); } List<Object> aslist =arrays.aslist (args); Signature Signature=point.getsignature (); String name=Signature.getname (); Try {            Try{System.out.println ("Transaction log", "Pre-Notification", parameter: "+ Name +" Method: "+aslist); } finally{System.out.println ("Transaction log", "Post notification", parameter: "+ Name +" Method: "+aslist); } System.out.println ("Transaction log", "return notification", parameter: "+ Name +" Method: "+aslist); } Catch(Exception e) {//Todo:handle ExceptionSYSTEM.OUT.PRINTLN ("Transaction log", "Exception notification", parameter: "+ Name +" Method: "+aslist); }        returnobject; }}

Surround notification Be sure to return the value of the object, otherwise the content body of the target method will not be executed, i.e. it will not enter the implementation class method body.

Compared to the configured four notifications, the form of the surround notification is:

try{

try{

Front-facing notifications

}

finally{

Post notification

}

Back to Notifications

}

catch{

Exception notification

}

Spring's surround Notification