spring切面：注解：前后置增强（带参数、函数详情）

用注解定义增强
在项目中添加spring AOP相关的jar文件；
使用注解定义前置增强和后置增强实现日志功能；
编写spring配置文件，织入注解定义的增强。

1.aop/UserLogger注释增强类

package aop;

import java.util.Arrays;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.AfterReturning;


@Aspect
public class UserLogger {
@Before("execution(* biz.impl.*.*(..))")
//JoinPoint jp：spring会自动注入该连接点的实例
public void before(JoinPoint jp){
    System.out.println("注解前置增强");
    System.out.println("调用的方法："+jp.getSignature()+"，传递参数："+Arrays.toString(jp.getArgs()));
}
@AfterReturning(pointcut="execution(* biz.impl.*.*(..))",returning="returnResult")
//Object returnValue：与注解中的returnValue名字一致
public void afterReturning(JoinPoint jp,Object returnResult){
    System.out.println("注解后置增强");
    System.out.println("调用的方法："+jp.getSignature()+"，传递参数："+Arrays.toString(jp.getArgs())+"，返回参数："+returnResult);
}
}

2.applicationContext.xml配置文件

<?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:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
 <!-- 将前置增强类配成bean,交给spring管理 <bean id="loggerBefore" class="aop.LoggerBefore"></bean> 将后置增强类配成bean,交给spring管理 <bean id="afterReturning" class="aop.AfterReturning"></bean> 配置切面(将增强类关联给某个条件范围内的方法) <bean id="errorLogger" class="aop.ErrorLogger"></bean> -->
    <bean id="aroundLogger" class="aop.AroundLogger"></bean>
    <bean class="aop.UserLogger"></bean>
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    <!-- <aop:config> 配置切入点pointcut <aop:pointcut expression="execution(* biz.impl.*.*(..))" id="myPoint"/> <aop:advisor advice-ref="loggerBefore" pointcut-ref="myPoint"/> <aop:advisor advice-ref="afterReturning" pointcut-ref="myPoint"/> <aop:advisor advice-ref="errorLogger" pointcut-ref="myPoint"/> <aop:advisor advice-ref="aroundLogger" pointcut-ref="myPoint"/> </aop:config> -->
    <bean id="userBiz" class="biz.impl.UserBizImpl" p:userDao-ref="userDao">
      <!-- <property name="userDao" ref="userDao2"></property> -->
    </bean>
   <bean id="userDao" class="dao.impl.UserDaoImpl" />
   <bean id="userDao2" class="dao.impl.UserDaoImpl2" />
</beans>

3.dao.impl/UserDaoImpl类

package dao.impl;

import javax.management.RuntimeErrorException;

import dao.UserDao;
import entity.User;

public class UserDaoImpl implements UserDao {

    @Override
    public User findUser() {
        System.out.println("===========Dao层查询User 1==============");
        User u=new User("Tom",22);
        throw new RuntimeException("出现异常");
        //return u;
    }

}

4.Test方法

public static void main(String[] args) {

        //加载spring容器,解析配置文件
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
         UserBiz userBiz=(UserBiz) ac.getBean("userBiz");
         User u= userBiz.getUser(101);
         System.out.println(u.getUname()+","+u.getAge());
    }