spring切面：接口：环绕增强

1.aop/AroundLogger环绕增强类

package aop;

import java.lang.reflect.Method;
import java.util.Arrays;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.log4j.Logger;

import net.sf.cglib.proxy.MethodProxy;

public class AroundLogger implements MethodInterceptor {
	private static final Logger log = Logger.getLogger(AroundLogger.class);

	@Override
	public Object invoke(MethodInvocation arg0) throws Throwable {
		System.out.println("环绕——前置增强");
		Object target = arg0.getThis();//获取被代理对象
		Method method = arg0.getMethod();//获取被代理方法
		Object[] args = arg0.getArguments();//获取参数列表
		log.info("调用方法："+method.getName() +"，传参："+ Arrays.toString(args));
		try {
			Object obj = arg0.proceed();//调用目标方法，获取目标方法返回值
			log.info(obj);
			return obj;
		} catch (Throwable e) {
			log.error("出现异常" + e);
		}
		return null;
	}

}

2.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: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>
	<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>
</beans>

3.dao.impl/UserImpl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;
	}
}

3.Test类

package test;

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

import entity.User;

import biz.UserBiz;
import biz.impl.UserBizImpl;

import ioc.HelloWorld;

public class TestMain {
	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");
		//getUser()传入参数，测试环绕增强获取参数列表
		 User u= userBiz.getUser(101);
		 System.out.println(u.getUname()+","+u.getAge());
	}

}