21_AOP_Advice增强2（异常、引介）

package com.Higgin.part2;

import java.sql.SQLException;
/**
 * 模拟操作数据库并发生异常
 */
public class PersonDao {
    //查询所有Person
    public void getAllPerson(){
        throw new RuntimeException("运行时异常...");
    }
    
    //删除所有Person
    public void deleteAllPerson() throws Exception{
        throw new SQLException("删除数据异常...");
    }
}

package com.Higgin.part2;

import java.lang.reflect.Method;

import org.springframework.aop.ThrowsAdvice;

/**
 * 抛出异常增强：事务管理器
 * 实现的接口：ThrowsAdvice   
 * ThrowsAdvice异常抛出接口没有定义任何方法，是一个标识接口，在运行期间Spring使用反射机制自行判断
 */
public class TransactionManager implements ThrowsAdvice{

    /**
     * 我们必须使用 void afterThrowing(...)方法
     * 方法名：必须为afterThrowing
     * 方法入参：前三个入参Method method,Object[] args,Object target可选（要么三个都提供，要么都不提供），
     *               最后一个入参是Throwable或其子类（这里用了子类Exception）
     *  合法的例子：afterThrowing(SQLException ex)
     *            afterThrowing(RuntimeException ex)
     *            afterThrowing(Method method,Object[] args,Object target,RuntimeException ex)
     */
    public void afterThrowing(Method method,Object[] args,Object target,Exception ex){
        System.out.println("------抛出异常增强------");
        System.out.println("method Name=="+method.getName());
        System.out.println("获取抛出异常的信息："+ex.getMessage());
        System.out.println("成功滚回事务");
    }
}

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"  
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:cache="http://www.springframework.org/schema/cache"  
    xsi:schemaLocation="  
    http://www.springframework.org/schema/context  
    http://www.springframework.org/schema/context/spring-context.xsd  
    http://www.springframework.org/schema/beans  
    http://www.springframework.org/schema/beans/spring-beans.xsd  
    http://www.springframework.org/schema/tx  
    http://www.springframework.org/schema/tx/spring-tx.xsd  
    http://www.springframework.org/schema/jdbc  
    http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd  
    http://www.springframework.org/schema/cache  
    http://www.springframework.org/schema/cache/spring-cache-3.1.xsd  
    http://www.springframework.org/schema/aop  
    http://www.springframework.org/schema/aop/spring-aop.xsd  
    http://www.springframework.org/schema/util  
    http://www.springframework.org/schema/util/spring-util.xsd">
    
    <!-- 要增强的目标对象 -->
    <bean id="target" class="com.Higgin.part2.PersonDao"/>

    <!-- 抛出异常的增强  -->
    <bean id="transactionManager" class="com.Higgin.part2.TransactionManager"/>
    
    <!-- Spring代理工厂的成员变量配置（注意这里没有p:proxyInterfaces接口属性配置）-->
    <bean id="personDao" class="org.springframework.aop.framework.ProxyFactoryBean"
        p:interceptorNames="transactionManager"
        p:target-ref="target"
        p:proxyTargetClass="true"
    />
    
</beans>

package com.Higgin.part2.Test;

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

import com.Higgin.part2.PersonDao;

public class TestTransactionManager {
    public static void main(String[] args) throws Exception {
        ApplicationContext context=new ClassPathXmlApplicationContext("part2.xml");
        PersonDao personDao=(PersonDao) context.getBean("personDao");
        
        //分别执行下面两条
        personDao.deleteAllPerson();
        personDao.getAllPerson();
    }
}