【原创】spring 3 AOP配置

Spring AOP的配置可以采用两种方式：XML和Annotation（需要JDK 5.0+）。

?

1.以XML方式配置：

?

业务逻辑类BusinessServiceImpl .java：

package org.wh.tech.spring.aop;import org.springframework.beans.factory.annotation.Autowired;import org.wh.tech.spring.sample.SimpleBean;/** * @Author:wh007 *  * @Date:2011-7-4 * * @TODO:业务逻辑类 */public class BusinessServiceImpl implements BusinessService {@Autowiredprivate SimpleBean simpleBean;@Overridepublic void addProcess(String processName) {simpleBean.print(processName + " is added !") ;}@Overridepublic boolean updateProcess(String processName) {simpleBean.print(processName + " is updated !") ;return true;}}

?

?

XML切面类XMLExampleAspect.java:

package org.wh.tech.spring.aop;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;/** * @Author:wh007 *  * @Date:2011-7-4 *  * @TODO:XML配置切面类 */public class XMLExampleAspect {/* * Around advice: 执行在join point这个方法执行之前与之后的advice。 */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;}/* * After advice: 执行在join point这个方法执行之后的advice。 */public void doAfter(JoinPoint jp) {System.out.println("log Ending method: "+ jp.getTarget().getClass().getName() + "."+ jp.getSignature().getName());}/* * Before advice: 执行在join point这个方法执行之前的advice。 */public void doBefore(JoinPoint jp) {System.out.println("log Begining method: "+ jp.getTarget().getClass().getName() + "."+ jp.getSignature().getName());}/* * Throwing advice: 执行在join point这个方法抛出异常之后的advice。 */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());}}

?

?

测试类TestXmlAop.java

?

package org.wh.tech.spring.aop.test;import org.junit.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;import org.wh.tech.spring.aop.BusinessService;/** * @Author:wh007 *  * @Date:2011-7-4 * * @TODO:以XML方式配置Aop测试 */@ContextConfiguration(locations={"classpath:applicationContext-*.xml"})public class TestXmlAop  extends AbstractJUnit4SpringContextTests{@Autowiredprivate BusinessService businessService;@Test public void testAddProcess(){businessService.addProcess("1st,");}}

?

applicationContext.xml需要配置：

<!-- 以XML方式配置Aop --><aop:config><aop:aspect id="xmlAspect" ref="xmlAspectBean"><aop:pointcut id="businessService"expression="execution(* org.wh.tech.spring.aop.*.*(..))" /><aop:after pointcut-ref="businessService" method="doAfter" /><aop:before pointcut-ref="businessService" method="doBefore" /><aop:around pointcut-ref="businessService" method="doAround" /></aop:aspect></aop:config><bean id="xmlAspectBean" /><bean id="businessServiceImpl" name="code">package org.wh.tech.spring.aop;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.springframework.beans.factory.annotation.Autowired;import org.wh.tech.spring.sample.SimpleBean;/** * @Author:wh007 *  * @Date:2011-7-4 * * @TODO:通过annotation注解配置aop */@Aspectpublic class AnnotationExampleAspect {@Autowiredprivate SimpleBean simpleBean;/* * 定义pointcunt * */@Pointcut("execution(* org.wh.tech.spring.aop.*.*(..))")   public void aPointcut() {} /* * After-Returning advice: 执行在join point这个方法抛出异常之后的advice。 */@AfterReturning(pointcut = "aPointcut()", returning="r")public void doAfterReturning(boolean r) {if(r){simpleBean.print("return is :" + r);}else{simpleBean.print("r is null");}}}

?

?

测试类TestAnnotationAop.java：

package org.wh.tech.spring.aop.test;import org.junit.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;import org.wh.tech.spring.aop.BusinessService;/** * @Author:wh007 *  * @Date:2011-7-4 * * @TODO:以Annotation方式配置Aop测试 */@ContextConfiguration(locations={"classpath:applicationContext-*.xml"})public class TestAnnotationAop extends AbstractJUnit4SpringContextTests {@Autowiredprivate BusinessService businessService;@Testpublic void testUpdateProcess(){businessService.updateProcess("update,");}}

?

?

applicationContext.xml只需添加：

<!-- 以annotation方式配置Aop --><aop:aspectj-autoproxy /><bean id="annotationExampleAspect" />

?

3.小结：

两种方式各有优势：

1）XML方式灵活性更高，一旦出现配置变更，只需要修改配置文件而不需要程序进行改动，但配置较为复杂。

2）Annotation方式配置较为简洁，但变更成本较高，需要对程序进行修改。