SSM9.3【Spring：基于注解的AOP开发】

快速入门

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 代码实现

package com.haifei.anno;

/**
 * 目标接口
 */
public interface TargetInterface {

    public void save();

}

package com.haifei.anno;

import org.springframework.stereotype.Component;

/**
 * 目标类
 */
@Component("target")
public class Target implements TargetInterface {

    //切点方法
    @Override
    public void save() {
        System.out.println("save running...");
    }

}

 

package com.haifei.anno;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

/**
 * 切面类
 */
@Component("myAspect")
@Aspect //标注当前MyAspect类是一个切面类
public class MyAspect {

    //前置增强方法
//    @Before(value = "execution(* com.haifei.anno.*.*(..))")
//    @Before("execution(* com.haifei.anno.*.*(..))")
    public void beforeTarget(){
        System.out.println("前置增强..........");
    }

    //后置增强方法
//    @After("execution(* com.haifei.anno.*.*(..))")
    public void afterReturning(){
        System.out.println("后置增强..........");
    }

    //环绕增强方法
//    @Around("execution(* com.haifei.anno.*.*(..))")
    @Around("pointcut()") //或者 "MyAspect.pointcut()"
    public Object aroundTarget(ProceedingJoinPoint pjp) throws Throwable { //正在执行的连接点==切点
        System.out.println("环绕前增强");
        Object proceed = pjp.proceed(); //切点方法
        System.out.println("环绕后增强");
        return proceed;
    }

    //异常抛出增强方法
//    @AfterThrowing("execution(* com.haifei.anno.*.*(..))")
    public void afterThrowing(){
        System.out.println("异常抛出增强....");
    }

    //最终增强方法（不管抛不抛异常，该增强都会执行）
//    @After("execution(* com.haifei.anno.*.*(..))")
    @After("MyAspect.pointcut()")
    public void after(){
        System.out.println("最终增强....");
    }

    //定义方法-抽取切点表达式
    @Pointcut("execution(* com.haifei.anno.*.*(..))")
    public void pointcut(){}

}

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">


    <!--开启组件扫描-->
    <context:component-scan base-package="com.haifei.anno" />
    <!--配置AOP自动代理-->
    <aop:aspectj-autoproxy />


</beans>

package com.haifei.test;

import com.haifei.anno.TargetInterface;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext-anno.xml")
public class AnnoTest {

    @Autowired
    private TargetInterface target;

    @Test
    public void test1(){
        target.save();
        /*
        <context:component-scan base-package="com.haifei.anno" />
        @Before("execution(* com.haifei.anno.*.*(..))")
        public void beforeTarget(){...}
            save running...

        <context:component-scan base-package="com.haifei.anno" />
        <aop:aspectj-autoproxy />
        @Before("execution(* com.haifei.anno.*.*(..))")
        public void beforeTarget(){...}
            前置增强..........
            save running...
         */
    }

    @Test
    public void test2(){
        target.save();
        /*
        <context:component-scan base-package="com.haifei.anno" />
        <aop:aspectj-autoproxy />

        @Around("execution(* com.haifei.anno.*.*(..))")
        public Object aroundTarget(ProceedingJoinPoint pjp) throws Throwable {...}
        @After("execution(* com.haifei.anno.*.*(..))")
        public void after(){...}

        环绕前增强
        save running...
        环绕后增强
        最终增强....


       定义方法-抽取切点表达式
       效果同上
         */
    }

}

注解配置AOP详解