In this tutorial, you will learn how to use AspectJ in spring for making log in spring application.

Spring AOP AspectJ Logging Example

@AspectJ is a style of declaring a aspects as a regular java classes. To implement AspectJ in your application you need to configure config.xml file in spring. For example:-
<aop:aspect id="aopAspect" ref="aspectLogging">
                <aop:before pointcut-ref="pointcutLog" method="logEntry" />
</aop:aspect>

SimpleBean.java

package roseindia.net.bean;

public class SimpleBean {
	private String name;
	private int age;

	public SimpleBean() {
	}

	public SimpleBean(final String name, int age) {
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String setNameAndAge() {
		return this.name + " (" + this.age + ")";
	}
}

AspectLogger.java

package roseindia.net.logger;

import org.aspectj.lang.JoinPoint;

public class AspectLogger {
	public void logEntry(JoinPoint joinPoint) {
		log("Currently in " + joinPoint.getSignature().getName() + "()");
	}

	public void logExit(JoinPoint joinPoint) {
		log("Currently in " + joinPoint.getSignature().getName() + "()");
	}

	public void logAroundAdvice(JoinPoint joinPoint) {
		log("Currently in " + joinPoint.getSignature().getName() + "()");
	}

	public void logExitAfterReturn(JoinPoint joinPoint) {
		log("Currently in " + joinPoint.getSignature().getName() + "()");
	}

	public void logAfterThrowsAdvice(JoinPoint joinPoint) {
		log("Currently in " + joinPoint.getSignature().getName() + "()");
	}

	public static void log(String LogMessage) {
		System.err.println(LogMessage);
	}
}

ContentClass.java

package roseindia.net.logger;

import roseindia.net.bean.SimpleBean;

public class ContentClass {
	public static void loggerDetail(SimpleBean simpleBean) {
		System.out.println("Student Logger Detail");
		System.out
				.println("**************************************************************");
		System.out.println("Name: " + simpleBean.getName());
		System.out.println("Age: " + simpleBean.getAge());
		System.out.println("Name (Age): " + simpleBean.setNameAndAge());
		System.out
				.println("**************************************************************");
	}
}

MainClaz.java

package roseindia.net.main;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import roseindia.net.bean.SimpleBean;
import roseindia.net.logger.ContentClass;

public class MainClaz {
	public static void main(String[] args) {
		ConfigurableApplicationContext applicationContext = new ClassPathXmlApplicationContext(
				"config.xml");
		SimpleBean simpleBean = (SimpleBean) applicationContext
				.getBean("simpleBean");
		ContentClass contentClass = new ContentClass();
		contentClass.loggerDetail(simpleBean);
		applicationContext.close();
	}
}

config.xml

When you run this application it will display message as shown below:

Student Logger Detail ************************************************************* Currently in getName() Currently in getName() Currently in getName() Name: Vinay Currently in getAge() Currently in getAge() Currently in getAge() Currently in setNameAndAge() Currently in setNameAndAge() Currently in setNameAndAge() Age: 24 Name (Age): Vinay (24) **************************************************************

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