Spring AOP – @AfterReturning Advice

Spring AOP – @AfterReturning Advice

We have discussed earlier the types of advices available in Spring AOP. One of them is After Returning advice. It is an advice that executes after the normal execution of a method (without any exception).

Let’s understand the concept of after returning advice with the help of an example.

Example of @AfterReturning Advice

Here, we are going to create an example of after returning advice using @AfterReturning annotation.

Following are the steps to create an example of @AfterReturning:

• Create a bean

In this step, we are going to create a bean named Account, that stores an object. We have also defined two constructors: no-argument and parametrized constructor to the Account class.

Account.java

public class Account {
private String name;
private String code;
//no-argument constructor
public Account() { }
//argument constructor 
public Account(String name, String code) {
this.name = name;
this.code = code;
}
public String getName() { 
return name;
}
public void setName(String name) {
 this.name = name;
 }
public String getCode() {
return code; 
}
public void setCode(String code) {
this.code = code;
}
//defining toString() method
@Override
public String toString() { 
return "Account [name=" + name + ", code=" + code + "]";
}
} 

• Create the DAO class

In this step, we are going to create a DAO class named StudentAccountDao, that contains the business logic.

StudentAccountDao.java

import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Component;
@Component
public class StudentAccountDao {
public List<Account> findAcc() {
List myacc = new ArrayList();
Account ac1 = new Account( "jyotika", "ABC01" );
Account ac2 = new Account( "neha", "ABC05" );
Account ac3 = new Account( "shuhbham", "ABC06" ); 
myacc.add(ac1);
myacc.add(ac2);   
myacc.add(ac3);
return myacc ;
}
} 

• Create a class that performs component scanning

In this step, we are going to create a class named DemoAOP, that performs the component scanning.

DemoAOP.java

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@Configuration
@EnableAspectJAutoProxy
@ComponentScan( "com.app.SpringAOP_AfterReturn" )
public class DemoAOP {
} 

• Create a class that contains the Aspect logic

In this step, we are going to create a class named AspectClass, that contains the Aspect logic (advice types and pointcut expressions).

AspectClass.java

import java.util.List;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect
@Component
public class AspectClass { 
@AfterReturning(pointcut = " execution(* com.app.SpringAOP_AfterReturn.*.*()) ", 
returning = "result" )
public void afterReturningFindAccount(JoinPoint jp, List result) {
String method = jp.getSignature().toShortString();
System.out.println("Executing the @AfterReturning on method : " + method );
System.out.println("\n Result : " + result);
}
} 

• Create the main class

In this step, we are going to create a main class named App, that contains the main method.

App.java

import java.util.List;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class App 
{
public static void main( String[] args )
{
AnnotationConfigApplicationContext appcontext = new AnnotationConfigApplicationContext(DemoAOP.class);
// defining the Student dao class
StudentAccountDao studacc = appcontext.getBean("studentAccountDao", StudentAccountDao.class);
List<Account> myacc = studacc.findAcc(); 
System.out.println(" Main program - @AfterReturning ");
System.out.println("-----------");
 appcontext.close();
}
} 

Output

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