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【转】Spring Aop实例 .

 
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一、XML方式

1. TestAspect:切面类

  1. package com.spring.aop;  
  2.   
  3. import org.aspectj.lang.JoinPoint;  
  4. import org.aspectj.lang.ProceedingJoinPoint;  
  5.   
  6. public class TestAspect {  
  7.   
  8.     public void doAfter(JoinPoint jp) {  
  9.         System.out.println("log Ending method: " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName());  
  10.     }  
  11.   
  12.     public Object doAround(ProceedingJoinPoint pjp) throws Throwable {  
  13.         long time = System.currentTimeMillis();  
  14.         Object retVal = pjp.proceed();  
  15.         time = System.currentTimeMillis() - time;  
  16.         System.out.println("process time: " + time + " ms");  
  17.         return retVal;  
  18.     }  
  19.   
  20.     public void doBefore(JoinPoint jp) {  
  21.         System.out.println("log Begining method: " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName());  
  22.     }  
  23.   
  24.     public void doThrowing(JoinPoint jp, Throwable ex) {  
  25.         System.out.println("method " + jp.getTarget().getClass().getName() + "." + jp.getSignature().getName() + " throw exception");  
  26.         System.out.println(ex.getMessage());  
  27.     }  
  28. }  
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

  1. package com.spring.service;  
  2.   
  3. // 使用jdk动态代理   
  4. public class AServiceImpl implements AService {  
  5.   
  6.     public void barA() {  
  7.         System.out.println("AServiceImpl.barA()");  
  8.     }  
  9.   
  10.     public void fooA(String _msg) {  
  11.         System.out.println("AServiceImpl.fooA(msg:" + _msg + ")");  
  12.     }  
  13. }  
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

  1. package com.spring.service;  
  2.   
  3. // 使用cglib   
  4. public class BServiceImpl {  
  5.   
  6.     public void barB(String _msg, int _type) {  
  7.         System.out.println("BServiceImpl.barB(msg:" + _msg + " type:" + _type + ")");  
  8.         if (_type == 1)  
  9.             throw new IllegalArgumentException("测试异常");  
  10.     }  
  11.   
  12.     public void fooB() {  
  13.         System.out.println("BServiceImpl.fooB()");  
  14.     }  
  15.   
  16. }  
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

  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <beans xmlns="http://www.springframework.org/schema/beans"  
  3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  4.     xmlns:aop="http://www.springframework.org/schema/aop"  
  5.     xmlns:context="http://www.springframework.org/schema/context"  
  6.     xmlns:tx="http://www.springframework.org/schema/tx"  
  7.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
  8.         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd  
  9.         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd  
  10.         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">  
  11.     <aop:config>  
  12.         <aop:aspect id="TestAspect" ref="aspectBean">  
  13.             <!--配置com.spring.service包下所有类或接口的所有方法-->  
  14.             <aop:pointcut id="businessService" expression="execution(* com.spring.service.*.*(..))" />  
  15.             <aop:before pointcut-ref="businessService" method="doBefore"/>  
  16.             <aop:after pointcut-ref="businessService" method="doAfter"/>  
  17.             <aop:around pointcut-ref="businessService" method="doAround"/>  
  18.             <aop:after-throwing pointcut-ref="businessService" method="doThrowing" throwing="ex"/>  
  19.         </aop:aspect>  
  20.     </aop:config>  
  21.       
  22.     <bean id="aspectBean" class="com.spring.aop.TestAspect" />  
  23.     <bean id="aService" class="com.spring.service.AServiceImpl"></bean>  
  24.     <bean id="bService" class="com.spring.service.BServiceImpl"></bean>  
  25. </beans>  
<?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>

 

二、注解(Annotation)方式

1. TestAnnotationAspect

  1. package com.spring.aop;  
  2.   
  3. import org.aspectj.lang.ProceedingJoinPoint;  
  4. import org.aspectj.lang.annotation.After;  
  5. import org.aspectj.lang.annotation.AfterReturning;  
  6. import org.aspectj.lang.annotation.AfterThrowing;  
  7. import org.aspectj.lang.annotation.Around;  
  8. import org.aspectj.lang.annotation.Aspect;  
  9. import org.aspectj.lang.annotation.Before;  
  10. import org.aspectj.lang.annotation.Pointcut;  
  11.   
  12. @Aspect  
  13. public class TestAnnotationAspect {  
  14.   
  15.     @Pointcut("execution(* com.spring.service.*.*(..))")  
  16.     private void pointCutMethod() {  
  17.     }  
  18.   
  19.     //声明前置通知   
  20.     @Before("pointCutMethod()")  
  21.     public void doBefore() {  
  22.         System.out.println("前置通知");  
  23.     }  
  24.   
  25.     //声明后置通知   
  26.     @AfterReturning(pointcut = "pointCutMethod()", returning = "result")  
  27.     public void doAfterReturning(String result) {  
  28.         System.out.println("后置通知");  
  29.         System.out.println("---" + result + "---");  
  30.     }  
  31.   
  32.     //声明例外通知   
  33.     @AfterThrowing(pointcut = "pointCutMethod()", throwing = "e")  
  34.     public void doAfterThrowing(Exception e) {  
  35.         System.out.println("例外通知");  
  36.         System.out.println(e.getMessage());  
  37.     }  
  38.   
  39.     //声明最终通知   
  40.     @After("pointCutMethod()")  
  41.     public void doAfter() {  
  42.         System.out.println("最终通知");  
  43.     }  
  44.   
  45.     //声明环绕通知   
  46.     @Around("pointCutMethod()")  
  47.     public Object doAround(ProceedingJoinPoint pjp) throws Throwable {  
  48.         System.out.println("进入方法---环绕通知");  
  49.         Object o = pjp.proceed();  
  50.         System.out.println("退出方法---环绕通知");  
  51.         return o;  
  52.     }  
  53. }  
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

  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <beans xmlns="http://www.springframework.org/schema/beans"  
  3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  4.     xmlns:aop="http://www.springframework.org/schema/aop"  
  5.     xmlns:context="http://www.springframework.org/schema/context"  
  6.     xmlns:tx="http://www.springframework.org/schema/tx"  
  7.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd   
  8.         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd   
  9.         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd   
  10.         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">   
  11.     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>  
  12.     <bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />  
  13.   
  14.     <bean id="aspectBean" class="com.spring.aop.TestAnnotationAspect" />  
  15.     <bean id="aService" class="com.spring.service.AServiceImpl"></bean>  
  16.     <bean id="bService" class="com.spring.service.BServiceImpl"></bean>  
  17. </beans>  
<?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>

 

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。

 

============友情链接============

Spring Aop详尽教程 http://blog.csdn.net/wangpeng047/article/details/8556800

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