后端-框架-Spring-AOP-注解注入-事物增强

后端-框架-Spring-AOP-注解注入

如果碰到代码无误,可能是JDK与aspectjweaver版本不匹配

pointcut位置

package cn.service;

import cn.service.UserService;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import cn.dao.UserDao;
import cn.entity.User;

/**
 * 用户业务类，实现对User功能的业务管理
 */
@Service("UserService")
public class UserServiceImpl implements UserService {
	private UserDao dao;
	
	@Resource(name="UserDao")
	public void setDao(UserDao dao) {
		this.dao = dao;
	}
	
	public UserServiceImpl(UserDao dao) {
		this.dao=dao;
	}

	public void addNewUser(User user) {
		dao.save(user);
	}
}

日志类

package cn.aop;

import java.util.Arrays;

import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class UserServiceLogger {
	public static Logger logger = Logger.getLogger(UserServiceLogger.class);
	
	//此处定义通用的pointcut
	@Pointcut("execution(* cn.service.UserService.*(..))")
	public void pointcut(){}
	
	@Before("pointcut()")
	public void before(JoinPoint jp){
		logger.info("调用对象："+jp.getTarget()+"方法："+jp.getSignature()+"方法参数"+Arrays.toString(jp.getArgs()));
	}
	@AfterReturning(pointcut="execution(* cn.service.UserService.*(..))",returning="result")
	public void afterReturn(JoinPoint jp,Object result){
		logger.info("调用对象："+jp.getTarget()+"方法："+jp.getSignature()+"方法返回值"+result);
	}
	@AfterThrowing(pointcut="execution(* cn.service.UserServiceImpl.*(..))",throwing="e")
	public void afterThrow(JoinPoint jp,Exception e){
		logger.error(jp.getSignature().getName()+"捕捉到异常"+e);
	}
	@After("pointcut()")
	public void after(JoinPoint jp){
		logger.info(jp.getSignature().getName()+"最终增强");
	}
	@Around("pointcut()")
	public Object around(ProceedingJoinPoint jp) throws Throwable{
		logger.info("调用对象："+jp.getTarget()+"方法："+jp.getSignature()+"方法参数"+Arrays.toString(jp.getArgs()));
		try {
			Object result = jp.proceed();
			logger.info("调用对象："+jp.getTarget()+"方法："+jp.getSignature()+"方法返回值"+result);
			return result;
		} catch (Throwable e) {
			logger.error(jp.getSignature().getName()+"捕捉到异常"+e);
			throw e;
		} finally{
			logger.info(jp.getSignature().getName()+"方法结束");
		}
	}
}

准备的ApplicationContext.xml

<?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-4.3.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-4.3.xsd"
    >
    <context:component-scan base-package="cn.dao,cn.service"/>
    
	<bean id="UserServiceLogger" class="cn.aop.UserServiceLogger"></bean>
	<!-- 启动Spring对AOP AspectJ注解支持 -->
	<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
	
</beans>