Spring Aop完整实例,按照下面说明配置和代码即可完成,因为在刚接触新东西时,最简单的就是一个可以运行的DEMO,可查了很多文章都是不全或者运行有问题,所以自己写一个。
说明:本文需要有Spring IOC基础。
参考了 http://blog.csdn.net/wangpeng047/article/details/8560694
Spring 环境搭建就不说了,可以看我其他文章里面内容,不过要使用AOP需要一个 aspectjweaver-1.6.9.jar,下载后放入项目里面。
一、XML方式
1. TestAspect:切面类
[java]
package com.spring.aop;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
public class TestAspect {
public void doAfter(JoinPoint jp) {
System.out.println("log Ending method: " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName());
}
public Object doAround(ProceedingJoinPoint pjp) throws Throwable {
long time = System.currentTimeMillis();
Object retVal = pjp.proceed();
time = System.currentTimeMillis() - time;
System.out.println("process time: " + time + " ms");
return retVal;
}
public void doBefore(JoinPoint jp) {
System.out.println("log Begining method: " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName());
}
public void doThrowing(JoinPoint jp, Throwable ex) {
System.out.println("method " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName() + " throw exception");
System.out.println(ex.getMessage());
}
}2. AServiceImpl:目标对象
[java]
package com.spring.service;
// 使用jdk动态代理
public class AServiceImpl implements AService {
public void barA() {
System.out.println("AServiceImpl.barA()");
}
public void fooA(String _msg) {
System.out.println("AServiceImpl.fooA(msg:" + _msg + ")");
}
}3. BServiceImpl:目标对象
package com.spring.service;
// 使用cglib
public class BServiceImpl {
public void barB(String _msg, int _type) {
System.out.println("BServiceImpl.barB(msg:" + _msg + " type:" + _type + ")");
if (_type == 1)
throw new IllegalArgumentException("测试异常");
}
public void fooB() {
System.out.println("BServiceImpl.fooB()");
}
}4. ApplicationContext:Spring配置文件
[html] <?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" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> <aop:config> <aop:aspect id="TestAspect" ref="aspectBean"> <!--配置com.spring.service包下所有类或接口的所有方法--> <aop:pointcut id="businessService" expression="execution(* com.spring.service.*.*(..))" /> <aop:before pointcut-ref="businessService" method="doBefore"/> <aop:after pointcut-ref="businessService" method="doAfter"/> <aop:around pointcut-ref="businessService" method="doAround"/> <aop:after-throwing pointcut-ref="businessService" method="doThrowing" throwing="ex"/> </aop:aspect> </aop:config> <bean id="aspectBean" class="com.spring.aop.TestAspect" /> <bean id="aService" class="com.spring.service.AServiceImpl"></bean> <bean id="bService" class="com.spring.service.BServiceImpl"></bean> </beans>
说明:这里 * com.spring.service.*.*(..)) *和com中间有一个空格。
测试类:
[java]
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMain {
/**
* @param args
*/
public static void testSpringAOP(){
ApplicationContext ctx = new ClassPathXmlApplicationContext("config/applicationContext.xml");
AService aService = (AService)ctx.getBean("aService");
aService.fooA("zhangsan");
}
public static void main(String[] args) {
testSpringAOP();
}
}运行结果:
[java] log Begining method: com.aop.test.AServiceImpl.fooA AServiceImpl.fooA(msg:zhangsan) logEndingmethod: com.aop.test.AServiceImpl.fooA process time: 1 ms
如果报异常:java.lang.NoClassDefFoundError: org/aopalliance/aop/Advice
缺少包com.springsource.org.aopalliance-1.0.0.jar,下载地址 http://ebr.springsource.com/repository/app/bundle/version/download;jsessionid=BEA6BAD3421E4C82FCF33C4D8EA98867.jvm1?name=com.springsource.org.aopalliance&version=1.0.0&type=binary
二、注解(Annotation)方式
1. TestAnnotationAspect
[java]
package com.spring.aop;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
public class TestAnnotationAspect {
@Pointcut("execution(* com.spring.service.*.*(..))")
private void pointCutMethod() {
}
//声明前置通知
@Before("pointCutMethod()")
public void doBefore() {
System.out.println("前置通知");
}
//声明后置通知
@AfterReturning(pointcut = "pointCutMethod()", returning = "result")
public void doAfterReturning(String result) {
System.out.println("后置通知");
System.out.println("---" + result + "---");
}
//声明例外通知
@AfterThrowing(pointcut = "pointCutMethod()", throwing = "e")
public void doAfterThrowing(Exception e) {
System.out.println("例外通知");
System.out.println(e.getMessage());
}
//声明最终通知
@After("pointCutMethod()")
public void doAfter() {
System.out.println("最终通知");
}
//声明环绕通知
@Around("pointCutMethod()")
public Object doAround(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("进入方法---环绕通知");
Object o = pjp.proceed();
System.out.println("退出方法---环绕通知");
return o;
}
}2. ApplicationContext:Spring配置文件
[java] <?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" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> <aop:aspectj-autoproxy></aop:aspectj-autoproxy> <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" /> <bean id="aspectBean" class="com.spring.aop.TestAnnotationAspect" /> <bean id="aService" class="com.spring.service.AServiceImpl"></bean> <bean id="bService" class="com.spring.service.BServiceImpl"></bean> </beans>
注意:bean 的路径
测试类:
[java]
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMain {
/**
* @param args
*/
public static void testSpringAOP(){
ApplicationContext ctx = new ClassPathXmlApplicationContext("config/applicationContext.xml");
AService aService = (AService)ctx.getBean("aService");
aService.fooA("zhangsan");
}
public static void main(String[] args) {
testSpringAOP();
}
}运行测试结果:
[java] 进入方法---环绕通知 前置通知 进入方法---环绕通知 前置通知 AServiceImpl.fooA(msg:zhangsan) 退出方法---环绕通知 最终通知 后置通知 ---null--- 退出方法---环绕通知 最终通知 后置通知 ---null---
关于切入点表达式,大家需要好好练习才能深入理解其中含义。即使看的懂,但是写起来却非常麻烦,并没有想象中那么简单。
最后,再告诉大家:
任何通知(Advice)方法可以将第一个参数定义为 org.aspectj.lang.JoinPoint类型。JoinPoint接口提供了一系列有用的方法, 比如 getArgs() (返回方法参数)、getThis() (返回代理对象)、getTarget() (返回目标)、getSignature() (返回正在被通知的方法相关信息)和 toString() (打印出正在被通知的方法的有用信息。
其中getSignature()返回的Signature对象可强制转换为MethodSignature,其功能非常强大,能获取包括参数名称在内的一切方法信息。