[Spring实战系列]（18）注解切面

package com.sjf.bean;
/**
 * 歌手实体类
 * @author sjf0115
 *
 */
public class Singer {
 
	public void perform() {
		System.out.println("正在上演个人演唱会... ");
	}
}

package com.sjf.bean;
 
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
 
/**
 * 观众实体类（注解为切面）
 * @author sjf0115
 *
 */
@Aspect
public class Audience {
	// 定义切点
	@Pointcut("execution(* com.sjf.bean.Singer.perform(..))")
	public void SingerPerform(){
		// 空方法
	}
	// 表演之前
	@Before("SingerPerform()")
	public void takeSeats(){
		System.out.println("the audience is taking their seats...");
	}
	// 表演成功之后
	@AfterReturning("SingerPerform()")
	public void applaud(){
		System.out.println("very good, clap clap clap...");
	}
	// 表演失败之后
	@AfterThrowing("SingerPerform()")
	public void demandRefund(){
		System.out.println("very bad, We want our money back...");
	}
}

<?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:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
		
		<bean id = "singer" class = "com.sjf.bean.Singer">
		</bean>
		
		<bean id = "audience" class = "com.sjf.bean.Audience">
		</bean>
		
		<aop:aspectj-autoproxy/>
</beans>

@Around("SingerPerform()")
	public void PerformTime(ProceedingJoinPoint joinPoint){
		// 演出之前
		System.out.println("the audience is taking their seats...");
		try {
			long start = System.currentTimeMillis();
			// 执行演出操作
			joinPoint.proceed();
			long end = System.currentTimeMillis();
			// 演出成功
			System.out.println("very good, clap clap clap...");
			System.out.println("该演出共需要 "+(end - start) + " milliseconds");
		} catch (Throwable e) {
			// 演出失败
			System.out.println("very bad, We want our money back...");
			e.printStackTrace();
		}
	}

package com.sjf.bean;
/**
 * 歌手实体类
 * @author sjf0115
 *
 */
public class Singer {
 
	public void perform(String song) {
		System.out.println("正在上演个人演唱会... " + song);
	}
}

package com.sjf.bean;
 
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
 
/**
 * 主办方实体类
 * @author sjf0115
 *
 */
@Aspect
public class Organizers {
	
	// 定义切点
	@Pointcut("execution(* com.sjf.bean.Singer.perform(String)) and args(song)")
	public void SingerPerform(){
		// 
	}
	// 表演之前
	@Before("SingerPerform() and args(song)")
	public void BeforeSong(String song){
		System.out.println("演唱会马上就开始了，演唱歌曲为 " + song);
	}
}

	// 定义切点
	@Pointcut("execution(* com.sjf.bean.Singer.perform(String)) and args(song)")
	public void SingerPerform(String song){
		// 
	}
	// 表演之前
	@Before("SingerPerform(song)")
	public void BeforeSong(String song){
		System.out.println("演唱会马上就开始了，演唱歌曲为 " + song);
	}