由于最近的服务项目提供接口有一个需求，所有操作都必须检查操作的服务可用，所以感觉Aop特别适合实施。完成学习的小例子。
关于spring-Aop原理：http://m.oschina.net/blog/174838这篇文章写的非常好。
个人觉着可能上线的时候配置文件更方便一下。所以样例主要是配置文件方式
Demo文件下载地址：
http://download.csdn.net/detail/ruishenh/7261121
Spring配置文件
/idle-service-impl/src/main/resources/spring/app-config.xml
<?xml version="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
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:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-3.2.xsd">
<context:component-scanbase-package="com.ruishenh.business.impl" />
<aop:aspectj-autoproxyexpose-proxy="true" proxy-target-class="true"/>
<context:annotation-config/>
<!-- -->
<beanid="springFactoryUtil"class="com.ruishenh.utils.SpringFactoryUtil" />
<!-- -->
<importresource="aop-advisor.xml" />
</beans>
导入的aop-advisor.xml文件
/idle-service-impl/src/main/resources/spring/aop-advisor.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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-3.1.xsd">
<bean id="genericAdvisor" class="com.ruishenh.aop.aspect.advisor.GenericAdvisor"/>
<aop:config>
<!-- 定义切面 -->
<aop:aspect ref="genericAdvisor" order="0">
<!-- 定义连接点 -->
<aop:pointcut id="businessService" expression="execution(*com.ruishenh.business.impl..*.*(..))" />
<!-- 定义前置 -->
<aop:before method="before" pointcut-ref="businessService"/>
<!-- 定义围绕 -->
<aop:around method="heartbeat" pointcut-ref="businessService"/>
<!-- 定义后置 -->
<aop:after method="after" pointcut-ref="businessService"/>
<!-- 定义Target处理后普通结果增强 -->
<aop:after-returning method="afterReturning" pointcut-ref="businessService" returning="obj"/>
<!-- 定义Target处理后异常增强 -->
<aop:after-throwing method="handlerException" pointcut-ref="businessService" throwing="e"/>
</aop:aspect>
</aop:config>
</beans>
关于这个类
com.ruishenh.aop.aspect.advisor.GenericAdvisor中方法有
1. before 相应Target运行之前
2. heartbeat这个是围绕的一个方法
3. after 相应target运行之后
4. afterReturning 相应在target处理后结果返回增强处理
5. handlerException 相应在target运行异常时增强处理
/idle-service-impl/src/main/java/com/ruishenh/aop/aspect/advisor/GenericAdvisor.java源代码
package com.ruishenh.aop.aspect.advisor;
import org.aspectj.lang.JoinPoint;
importorg.aspectj.lang.ProceedingJoinPoint;
import com.ruishenh.domain.account.AccountBank;
public class GenericAdvisor {
/**
* 对于要增强的方法。运行围绕处理检查心跳是否正常
* @param joinPoint
* @return
* @throws Throwable
*/
Objectheartbeat(ProceedingJoinPoint joinPoint) throws Throwable{
// if(checkHeartbeat()) {
//
// }
System.out.println("2joinPoint.Signature.name："+joinPoint.getSignature().getName());
//记得在调用运行方法的时候异常不要try-catch，要thrwos出去，不然可能事务层没法起效，或者增强异常处理也无法起效
Objectobj=joinPoint.proceed();
//下边的參入參数能够改动。可是类型和方法的个数要和原来一致，不然原方法无法运行
// Objectobj=joinPoint.proceed(joinPoint.getArgs());
//对于返回后对象，有可能要做处理，对返回參数的某一些值处理，
//能够通过org.springframework.beans.BeanUtils.copyProperties把一些值赋值
if(obj==null) {
returnnew AccountBank();
}
returnobj;
}
/**
* 对于要增强的方法，在方法之前运行
* @param joinPoint 连接点信息
*/
voidbefore(JoinPoint joinPoint){
Object[] objs=joinPoint.getArgs();
System.out.println("1objs:"+objs[0]);
System.out.println("1joinPoint:"+joinPoint);
};
/**
* 对于要增强的方法，在方法之后运行
* @param joinPoint 连接点信息
*/
voidafter(JoinPoint joinPoint){
Object[] objs=joinPoint.getArgs();
System.out.println("4objs:"+objs[0]);
System.out.println("4joinPoint:"+joinPoint);
};
/**
* 对于要添加的方法，方法返回结果后。对结果进行记录或者分析
* 方法
* @param obj target运行后返回的结果
*/
voidafterReturning(Object obj){
System.out.println("3obj:"+obj);
};
/**
* 对于要增强的方法，方法抛出异常后。对异常的增强处理，比方记录异常。或者依据异常分析数据什么的
* @param e target运行后抛出的异常
*/
voidhandlerException(Throwable e){
System.out.println("handingException......");
e.printStackTrace();
}
booleancheckHeartbeat(){
returntrue;
}
}Junit測试
/idle-service-impl/src/test/java/com/ruishenh/business/impl/account/AccountServiceImplTest.java
package com.ruishenh.business.impl.account;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
importorg.springframework.test.context.ContextConfiguration;
importorg.springframework.test.context.junit4.SpringJUnit4ClassRunner;
importcom.ruishenh.domain.account.AccountBank;
importcom.ruishenh.domain.account.AccountBankParam;
import com.ruishenh.utils.SpringFactoryUtil;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:/spring/app-config.xml"})
public class AccountServiceImplTest {
@Before
publicvoid setUp() throws Exception {
}
@Test
publicvoid testStoreIn() throws Exception {
AccountServiceImplimpl= SpringFactoryUtil.getBean(AccountServiceImpl.class);
AccountBankParamparam= new AccountBankParam();
param.setId(100);
AccountBankab=impl.storeIn(param);
System.out.println(ab.toString());
}
}
运行后输出结果：
1objs:com.ruishenh.domain.account.AccountBankParam@d522de2[id=100,name=<null>,account=<null>]
1joinPoint:execution(AccountBankcom.ruishenh.business.impl.account.AccountServiceImpl.storeIn(AccountBankParam))
2joinPoint.Signature.name：storeIn
==============todo=====================
4objs:com.ruishenh.domain.account.AccountBankParam@d522de2[id=100,name=<null>,account=<null>]
4joinPoint:execution(AccountBankcom.ruishenh.business.impl.account.AccountServiceImpl.storeIn(AccountBankParam))
3obj:com.ruishenh.domain.account.AccountBank@2d397e5c[id=0,name=<null>,account=<null>]
com.ruishenh.domain.account.AccountBank@2d397e5c[id=0,name=<null>,account=<null>]
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