Practical 8.0

XML Schema Based AOP with Spring

To use the AOP namespace tags described in this section, you need to import the springAOP schema as described

<?xml version = “1.0” encoding = “UTF-8”?>

<beans xmlns = “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-beans-3.0.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd”>

<!-- bean definition & AOP specific configuration -->

</beans>

You will also need the following AspectJ libraries on the CLASSPATH of your application. These libraries are available in the ‘lib’ directory of an AspectJ installation, otherwise you can download them from the internet.

aspectjrt.jar

aspectjweaver.jar

aspectj.jar

aopalliance.jar

Logging.java

package com.hiraymca;

public class Logging {

/**

* This is the method which I would like to execute

* before a selected method execution.

*/

public void beforeAdvice(){

System.out.println(“Going to setup student profile.”);

}

/**

* This is the method which I would like to execute

* after a selected method execution.

*/

public void afterAdvice(){

System.out.println(“Student profile has been setup.”);

}

/**

* This is the method which I would like to execute

* when any method returns.

*/

public void afterReturningAdvice(Object retVal) {System.out.println(“Returning:” + retVal.toString());

}

Student.java

package com.hiraymca;

public class Student {private Integer age; private String name;

public void setAge(Integer age) {this.age = age;

}

public Integer getAge() {System.out.println(“Age : “ + age);

return age;

}

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

}

public String getName() {System.out.println(“Name : “ + name); return name;

}

public void printThrowException(){System.out.println(“Exception raised”);

throw new IllegalArgumentException();

}

}

MainApp.java

package com.hiraymca;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {

public static void main(String[] args) {

ApplicationContext context = new

ClassPathXmlApplicationContext(“Beans.xml”);

Student student = (Student) context.getBean(“student”); student.getName();

student.getAge(); student.printThrowException();

}

}

Beans.xml

<?xml version = “1.0” encoding = “UTF-8”?>

<beans xmlns = “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-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd “>

<aop:config>

<aop:aspect id = “log” ref = “logging”>

<aop:pointcut id = “selectAll”

expression = “execution(* com.tutorialspoint.*.*(..))”/>

<aop:before pointcut-ref = “selectAll” method = “beforeAdvice”/>

<aop:after pointcut-ref = “selectAll” method = “afterAdvice”/>

<aop:after-returning pointcut-ref = “selectAll” returning = “retVal” method = “afterReturningAdvice”/>

<aop:after-throwing pointcut-ref = “selectAll” throwing = “ex” method = “AfterThrowingAdvice”/>

</aop:aspect>

</aop:config>

<!-- Definition for student bean -->

<bean id = “student” class = “com.tutorialspoint.Student”>

<property name = “name” value = “Zara” />

<property name = “age” value = “11”/>

</bean>

<!-- Definition for logging aspect -->

<bean id = “logging” class = “com.tutorialspoint.Logging”/>

</beans>

Output

Going to setup student profile. Name : Zara

Student profile has been setup. Returning:Zara

Going to setup student profile. Age : 11

Student profile has been setup. Returning:11

Going to setup student profile. Exception raised

Student profile has been setup.

There has been an exception: java.lang.IllegalArgumentException

.....other exception content

Practical 8.1

Spring AOP – before advice

Write a program to demonstrate Spring AOP – before advice.

Logging.java

package com.hiraymca;

public class Logging {

//Types of Advice

//1 beforeAdvice

public void beforeAdvice()

{

System.out.println(“Setuping Student Profile “);

}

}

Student.java

package com.hiraymca;

public class Student {private int age; private String name; public int getAge() {

System.out.println(“Age-”+age);

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getName() {System.out.println(“Name=“+name); return name;

}

public void setName(String name) {

this.name = name;

}

}

MainApp.java

package com.hiraymca;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {

public static void main(String[] args) {

// TODO Auto-generated method stub

ApplicationContext context=new

ClassPathXmlApplicationContext(“Beans.xml”);

Student s=(Student)context.getBean(“student”); s.getName();

s.getAge();

}

}

Beans.xml

<?xml version=“1.0” encoding=“UTF-8”?>

<beans xmlns=“http://www.springframework.org/schema/beans” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xmlns:aop=“http://www.springframework.org/schema/aop” xmlns:c=“http://www.springframework.org/schema/c” xmlns:lang=“http://www.springframework.org/schema/lang” xmlns:util=“http://www.springframework.org/schema/util” xsi:schemaLocation=“http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/lang

http://www.springframework.org/schema/lang/spring-lang-4.3.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-4.3.xsd

http://www.springframework.org/schema/util

http://www.springframework.org/schema/util/spring-util-4.3.xsd”>

<aop:config>

<aop:aspect id=“log” ref=“logging”>

<aop:pointcut expression=“execution(* com.hiraymca.*.*(..))” id=“myid”/>

<aop:before method=“beforeAdvice” pointcut-ref=“myid”/>

</aop:aspect>

</aop:config>

<bean id=“student” class=“com.hiraymca.Student”>

<property name=“name” value=“Sukhiram”></property>

<property name=“age” value=“35”></property>

</bean>

<bean id=“logging” class=“com.hiraymca.Logging”></bean>

</beans>

Output

Setuping Student Profile Name=Sukhiram

Setuping Student Profile Age-35

Practical 8.2

Spring AOP – after advice

Write a program to demonstrate Spring AOP – after advice.

Logging.java

package com.hiraymca;

public class Logging {

//Types of Advice

//1 beforeAdvice

public void afterAdvice()

{

System.out.println(“Student Profile done “);

}

}

Student.java

package com.hiraymca;

public class Student {private int age; private String name; public int getAge() {

System.out.println(“Age-”+age);

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getName() {System.out.println(“Name=“+name); return name;

}

public void setName(String name) {

this.name = name;

}

}

MainApp.java

package com.hiraymca;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {

public static void main(String[] args) {

// TODO Auto-generated method stub ApplicationContext context=new

ClassPathXmlApplicationContext(“Beans.xml”);

Student s=(Student)context.getBean(“student”); s.getName();

s.getAge();

}

}

Beans.xml

<?xml version=“1.0” encoding=“UTF-8”?>

<beans xmlns=“http://www.springframework.org/schema/beans” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xmlns:aop=“http://www.springframework.org/schema/aop” xmlns:c=“http://www.springframework.org/schema/c” xmlns:lang=“http://www.springframework.org/schema/lang” xmlns:util=“http://www.springframework.org/schema/util” xsi:schemaLocation=“http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/lang

http://www.springframework.org/schema/lang/spring-lang-4.3.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-4.3.xsd

http://www.springframework.org/schema/util

http://www.springframework.org/schema/util/spring-util-4.3.xsd”>

<aop:config>

<aop:aspect id=“log” ref=“logging”>

<aop:pointcut expression=“execution(* com.hiraymca.*.*(..))” id=“myid”/>

<aop:after method=“afterAdvice” pointcut-ref=“myid” />

</aop:aspect>

</aop:config>

<bean id=“student” class=“com.hiraymca.Student”>

<property name=“name” value=“Sukhiram”></property>

<property name=“age” value=“35”></property>

</bean>

<bean id=“logging” class=“com.hiraymca.Logging”></bean>

</beans>

Output

Name=Sukhiram

Student Profile done

Age-35

Student Profile done