注解版增强处理

XML的配置文件：缺点：配置的工作量依旧很大，容易出错, 可阅读性比较差
解决方案：注解
切面 ：@Aspect
切入点 ：@Pointcut(“execution(* com.oupeng.service.UserService.*(…))”)

具体的增强处理注解

			前置增强：@Before("pointcut()")
			后置增强：@AfterReturning(pointcut="pointcut()",returning="result")
			环绕增强：@Around("execution(* com.oupeng.service.UserService.*(..))")
			异常处理增强： @AfterThrowing(pointcut="pointcut()",throwing="e")
			最终增强：@After("execution (* com.oupeng.service.impl.UserServiceImpl.addNewUser(..))")

	<!-- 增强处理类的配置 -->
	<bean class="com.oupeng.aop.ArroundLogger"></bean>
	<bean class="com.oupeng.aop.AfterLogger"></bean>
	<bean class="com.oupeng.aop.ErrorLogger"></bean>
	<bean class="com.oupeng.aop.UserServiceLogger" ></bean>
	<!--启用注解的支持  -->
	<aop:aspectj-autoproxy/>

环绕增强

<bean class="com.oupeng.aop.ArroundLogger"></bean>

package com.oupeng.aop;

import java.util.Arrays;

import org.apache.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;
@Aspect
public class ArroundLogger {
     
	private Logger log=Logger.getLogger(ArroundLogger.class);
	//定义环绕增强方法
	@Around("execution(* com.oupeng.service.UserService.*(..))")
	public Object arroundLogger(ProceedingJoinPoint jp){
     
		log.info("调用环绕增强开始了..."+jp.getSignature().getName()+"方法被调用，方法参数："+Arrays.toString(jp.getArgs()));
		Object object=null;
		try {
     
			//目标方法执行
			 object=jp.proceed();
		} catch (Throwable e) {
     
			e.printStackTrace();
		}
		
		log.info("调用环绕增强结束了..."+jp.getSignature().getName()+"方法被调用，方法返回值："+object);
		return object;
	}
}

最终增强

<bean class=" com.oupeng.aop.AfterLogger"></bean>

package com.oupeng.aop;

import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;

@Aspect
public class AfterLogger {
     

	private Logger log=Logger.getLogger(AfterLogger.class);
	
	//定义最终增强方法
	@After("execution (* com.oupeng.service.impl.UserServiceImpl.addNewUser(..))")
	public void afterLogger(JoinPoint jp){
     
		System.out.println("出纳开始准备数据....");
		System.out.println("开始打印每周财务报表....");
		System.out.println("开始打印每月的财务报表.....");
	}
}

异常增强

<bean class="com.oupeng.aop.ErrorLogger"></bean>

package com.oupeng.aop;

import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class ErrorLogger {
     
	private Logger log=Logger.getLogger(ErrorLogger.class);
	
	@Pointcut("execution(* com.oupeng.service.UserService.*(..))")
	public void pointcut(){
     
		
	} 
	
	//定义增强方法
	@AfterThrowing(pointcut="pointcut()",throwing="e")
	public void afterThrowing(JoinPoint jp,RuntimeException e){
     
		log.error(jp.getSignature().getName()+"方法发生了异常"+e.getMessage());
	}
}

前置和后置

<bean class="com.oupeng.aop.UserServiceLogger" ></bean>

package com.oupeng.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.oupeng.pojo.User;
import com.oupeng.service.UserService;

public class TestService {
     
	 @Test
	    public void testService() {
     
	      ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");	
	      UserService ud=(UserService) context.getBean("userService");
	      /*User user=new User();
	      user.setUserName("曹操");
	      user.setPassword("565566");
	      user.setEmail("[email protected]");
	      user.setId(001);*/
	      User user= (User) context.getBean("user");
	      ud.addNewUser(user);
          
	    }
	 
	 
	 @Test
		public void testException(){
     
			ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
			UserService ud=(UserService)context.getBean("userService");
			User user=(User)context.getBean("user");
			ud.addNewUser(user);
		}
	 @Test
		public void testArroundLogger(){
     
			ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
			UserService ud=(UserService)context.getBean("userService");
			User user=(User)context.getBean("user");
			ud.addNewUser(user);
		}
}