Spring Beginner's annotation implement AOP pre-notification and post-notification

Implements the subtraction of two integers and prints the log before and after each calculation.

Arithmeticcalculator.java:

 package   Spring.aop.impl;  public  interface   Arithmeticcalculator { int  Add (int  i,int   J);  int  Sub (int  i,int   J);  int  mul (int  i,int   J);  int  div (int  i,int   J); }

Arithmeticcalculatorimpl.java:

 PackageSpring.aop.impl;Importorg.springframework.stereotype.Component; @Component ("Arithmeticcalculator") Public classArithmeticcalculatorimplImplementsArithmeticcalculator { Public intAddintIintj) {intresult = i+J; returnresult; }     Public intSubintIintj) {intresult = IJ; returnresult; }     Public intMulintIintj) {intresult = i*J; returnresult; }     Public intDivintIintj) {intresult = i/J; returnresult; }}

Loggingaspect.java:

 PackageSpring.aop.impl;Importjava.util.Arrays;Importjava.util.List;ImportOrg.aspectj.lang.JoinPoint;ImportOrg.aspectj.lang.annotation.After;ImportOrg.aspectj.lang.annotation.Aspect;ImportOrg.aspectj.lang.annotation.Before;Importorg.springframework.stereotype.Component;//declare this class as a tangent: 1. Put the class into the IOC container, 2. Declare a tangent@Aspect @component Public classLoggingaspect {//declares that the method is a pre-notification: Executes before the target method@Before ("Execution (public int spring.aop.impl.*.* (int,int))")     Public voidBeforemethod (Joinpoint joinpoint) {String methodName=joinpoint.getsignature (). GetName (); List<Object> args=arrays.aslist (Joinpoint.getargs ()); System.out.println ("The method" +methodname+ "begins" +args); }        //Post notification: A notification that executes after the target method executes (regardless of whether an exception occurred). //cannot access the execution result of the target method in the post notification@After ("Execution (public int spring.aop.impl.*.* (int,int))")     Public voidAftermethod (Joinpoint joinpoint) {String methodName=joinpoint.getsignature (). GetName (); System.out.println ("The method" +methodname+ "ends"); }    }

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:context= "Http://www.springframework.org/schema/context"XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"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-4.3.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/ Spring-aop-4.3.xsd ">    <!--Configure automatic scanning of packages -    <Context:component-scanBase-package= "Spring.aop.impl" />            <!--make ASPECTJ annotations work, automatically generate proxy objects for matching classes -    <Aop:aspectj-autoproxy></Aop:aspectj-autoproxy></Beans>

Test:

 Packagespring.aop.impl.test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;ImportSpring.aop.impl.ArithmeticCalculator; Public classMain { Public Static voidMain (string[] args) {//1. Create a spring IOC containerApplicationContext ctx=NewClasspathxmlapplicationcontext ("Applicationcontext.xml"); //2. Get an instance of the bean from the containerArithmeticcalculator arithmeticcalculator= (arithmeticcalculator) Ctx.getbean ("Arithmeticcalculator"); //3. Using Beans        intresult = Arithmeticcalculator.add (5, 8); System.out.println ("Result:" +result); Result= Arithmeticcalculator.div (5, 8); System.out.println ("Result:" +result); }}

Output:

The method add begins[5, 8]the method Add Endsresult:themethod Div begins[5, 8]the method Div End Sresult:0

Spring Beginner's annotation implement AOP pre-notification and post-notification