Spring AOP(二)（Spring中基于AOP的@AspectJ）

@AspectJ 作为通过 Java 5 注释注释的普通的 Java 类，它指的是声明 aspects 的一种风格。

声明一个Aspect->声明一个切入点（需在xml配置文件中添加<aop:aspectj-autoproxy/>）

代码示例：

1.poem.xml（注意添加Spring AOP依赖的jar包aspectjrt.jar aspectjweaver.jar）

<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.10</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.8</version>

2.创建Student.java

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

public Student() {
}

public int getAge() {
return age;
}

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

public String getName() {
return name;
}

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

@Override
public String toString() {
return "Student{" + "age=" + age + ", name='" + name + '\'' + '}';
}
}

3.创建Logger.java

package com.ruanjianlin.demo;

import org.aspectj.lang.annotation.*;

/**
* Created by ruanjianlin on 2017/10/19.
*/
@Aspect
public class Logger {
@Pointcut("execution(* com.ruanjianlin..demo.*.*(..))")
private void selectAll(){}
@Before("selectAll()")
public void beforeAdvice(){
System.out.println("beforeAdvice");
}
@After("selectAll()")
public void afterRunning(){
System.out.println("afterRunning");
}
@AfterThrowing(value = "selectAll()",throwing = "ex")
public void afterThrowing(IllegalArgumentException ex){
System.out.println("afterThrowing"+ex.toString());
}
@AfterReturning(value = "selectAll()",returning = "val")
public void afterReturning(Object val){System.out.println("afterRturning"+val.toString());}
}

4.application.xml配置

<bean id="logger" class="com.ruanjianlin.demo.Logger"></bean>
<bean id="student" class="com.ruanjianlin.demo.Student">
<property name="name" value="ruanjinlin"/>
<property name="age" value="21"/>
</bean>
<aop:aspectj-autoproxy/>

5.测试类的使用

ApplicationContext context =
new ClassPathXmlApplicationContext("application.xml");
Student student = (Student) context.getBean("student");
student.getName();
student.getAge();

6.运行结果

beforeAdvice
afterRunning
afterRturningruanjinlin
beforeAdvice
afterRunning
afterRturning21