1. Take a look at the simple AOP configuration through XML

1. First create a simple Student class

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();
    }
}

2. Create a simple aspect class

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());
    }

    /**
     * This is the method which I would like to execute
     * if there is an exception raised.
     */
    public void AfterThrowingAdvice(IllegalArgumentException ex) {
        System.out.println("There has been an exception: " + ex.toString());
    }
}

3. SpringAOP.xml configuration

<bean id="student" class="com.seeyon.SpringBean.aop.Student" p:name="yangyu" p:age="27"></bean>
    <bean id="logging" class="com.seeyon.SpringBean.aop.Logging"></bean>

    <!--XML方式配置Spring AOP-->
    <aop:config>
        <aop:aspect id="log" ref="logging">   【切面class】
            <aop:pointcut id="studentMethod" expression="execution(* com.seeyon.SpringBean.aop.Student.get*(..))"/> 【切點】
            <aop:before pointcut-ref="studentMethod" method="beforeAdvice"/>  【方法執(zhí)行之前觸發(fā)切面class的beforeAdvice方法】
            <aop:after pointcut-ref="studentMethod" method="afterAdvice"/>    【方法執(zhí)行之后觸發(fā)切面class的afterAdvice方法】
        </aop:aspect>
    </aop:config>

Analyze this execution(* com.seeyon.SpringBean.aop.Student.get*(..)) pointcut expression:

(1) The first * represents the return value of the method is arbitrary

(2) get* represents All methods starting with get

(3)(..) represent any number of method parameters

4.main method

public class test {
    public static void main(String[] args) {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("SpringAop.xml");
        Student student = (Student) context.getBean("student");
        student.getName();
//        student.getAge();
//        student.printThrowException();
    }
}

5.Output results

Going to setup student profile.
Name : yangyu
Student profile has been setup.

2. Use of Spring AOP annotations .

1. First create a simple Student class (same as in .1, see above