结合Service层讲解DAO层的异常处理操作

public interface PersonDao {
 public void savePerson();
 public void updatePerson();
}
public class PersonDaoImpl implements PersonDao {
 
 public void savePerson() {
  int a = 1/0;
 }
 
 public void updatePerson() {
  Long.parseLong("aaa");
 }
 
}

public interface PersonService {
 void savePerson();
 void updatePerson();
}
public class PersonServiceImpl implements PersonService {
 
 private PersonDao personDao;//在这里选择set方式在spring的配置文件中进行注入
 
 public PersonDao getPersonDao() {
  return personDao;
 }
 public void setPersonDao(PersonDao personDao) {
  this.personDao = personDao;
 }
 public void savePerson() {
  personDao.savePerson();
 }
 public void updatePerson() {
  personDao.updatePerson();
 }
}

public class Exception {
 
 /**
  * 这是一个异常通知
  */
 public void exceptionMethod(JoinPoint joinPoint,Throwable ex){
  System.out.println(ex.getMessage());
 }
 
}

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:aop="http://www.springframework.org/schema/aop"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xsi:schemaLocation="http://www.springframework.org/schema/beans   
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd  
           http://www.springframework.org/schema/aop   
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">  
          
    <bean id="personDao" class="com.mo.dao.PersonDaoImpl"></bean>     
    
    <bean id="personService" class="com.mo.service.PersonServiceImpl">
     <!-- 用set方法注入 -->
     <property name="personDao" ref="personDao"></property>
    </bean>  
    
    <bean id="Exception" class="com.mo.exception.Exception"></bean>
      
    <aop:config>  
        <!-- 切入点表达式，确定目标类 -->  
        <aop:pointcut   
            expression="execution(* com.mo.service.PersonServiceImpl.*(..))"   
            id="perform"/>  
              
        <!-- ref指向的对象就是切面 -->  
        <aop:aspect ref="Exception">  
             <aop:after-throwing method="exceptionMethod" pointcut-ref="perform" throwing="ex"/>  
        </aop:aspect>  
    </aop:config>  
</beans>

@Test
public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");  
        PersonService personService = (PersonService)context.getBean("personService");
        personService.savePerson();
}