标签：ica getbean hid spec throws poi err www string
一、AOP简介：
二、AOP实例：
三、使用的例子
需求：在student添加的前后，打印日志信息；
0）spring AOP需要引用的jar包：
1）StudentService.java接口：
package com.cy.service; public interface StudentService { public void addStudent(String name); }
2）StudentServiceImpl.java实现类：
package com.cy.service.impl; import com.cy.service.StudentService; public class StudentServiceImpl implements StudentService { @Override public void addStudent(String name) { System.out.println("添加学生"+name); } }
3）StudentServiceAspect.java切面类：
package com.cy.advice; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; public class StudentServiceAspect { //前置通知，方法执行之前 public void doBefore(JoinPoint jp){ System.out.println("类名：" + jp.getTarget().getClass().getName()); System.out.println("方法名：" + jp.getSignature().getName()); System.out.println("开始添加学生：" + jp.getArgs()[0]); } //后置通知 方法完成之后 public void doAfter(JoinPoint jp){ System.out.println("类名：" + jp.getTarget().getClass().getName()); System.out.println("方法名：" + jp.getSignature().getName()); System.out.println("完成添加学生：" + jp.getArgs()[0]); } //环绕通知 可以在业务方法的前后添加逻辑 public Object doAround(ProceedingJoinPoint pjp) throws Throwable{ System.out.println("添加学生前"); Object retVal = pjp.proceed(); //retVal为StudentServiceImpl.addStudent(String name)方法的返回值 //因为返回值为void，所以console打印null System.out.println("添加学生后"); System.out.println(retVal); return retVal; } //返回通知 public void doAfterReturning(JoinPoint jp){ System.out.println("返回通知"); } //异常通知 public void doAfterThrowing(JoinPoint jp, Throwable ex){ System.out.println("异常通知"); System.out.println("异常信息：" + ex.getMessage()); } }
4）beans.xml配置：
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> <bean id="studentService" class="com.cy.service.impl.StudentServiceImpl"></bean> <bean id="studentServiceAspect" class="com.cy.advice.StudentServiceAspect"></bean> <aop:config> <aop:aspect id="studentServiceAspect" ref="studentServiceAspect"> <aop:pointcut expression="execution(* com.cy.service..*.*(..))" id="businessService"/> <aop:before method="doBefore" pointcut-ref="businessService"/> <aop:after method="doAfter" pointcut-ref="businessService"/> <aop:around method="doAround" pointcut-ref="businessService"/> <aop:after-returning method="doAfterReturning" pointcut-ref="businessService"/> <aop:after-throwing method="doAfterThrowing" pointcut-ref="businessService" throwing="ex"/> </aop:aspect> </aop:config> </beans>
5）测试代码：
public class T { public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml"); StudentService studentService = (StudentService) ac.getBean("studentService"); studentService.addStudent("张三"); } }
1）没有异常抛出时，没有异常通知；console打印：
2）addStudent方法中构造异常，有异常通知，console打印：
StudentServiceImpl.java:
package com.cy.service.impl; import com.cy.service.StudentService; public class StudentServiceImpl implements StudentService { @Override public void addStudent(String name) { System.out.println("添加学生"+name); System.out.println(1/0); } }
doAround方法中抛出异常是这句话：
-- Object retVal = pjp.proceed();
标签：ica getbean hid spec throws poi err www string
原文地址：http://www.cnblogs.com/tenWood/p/6901785.html
