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Spring3基于注释驱动的AOP

实在是郁闷刚刚编辑了一篇文章,由于字数的原因,没发布成功,好我就分开写吧,今天向大家介绍的是Spring基于注释驱动的AOP,其实估计这已经不是什么新技术了,但是我争取写的通俗易懂,大家从我这看一次就能明白,那就是我最高兴的了.

还是那样,今天我主要介绍如何配置,写出一个例子,然后大家按照例子一配就ok了.配置文件很简单,只需要在Spring配置文件中加入以下这句话就行了,下面这句话是让Spring启动自动AOP代理

 

  1. <!--启动spring的aop自动代理--> 
  2. <aop:aspectj-autoproxy/> 

然后再创建一个AOP类

 

  1. import org.aspectj.lang.JoinPoint;  
  2. import org.aspectj.lang.annotation.After;  
  3. import org.aspectj.lang.annotation.Aspect;  
  4. import org.springframework.beans.factory.annotation.Autowired;  
  5. import org.springframework.stereotype.Service;  
  6.  
  7. import com.pdp.biz.dao.usermanage.UserDAO;  
  8.  
  9. /**  
  10.  * ClassName:DemoAop  
  11.  * Reason:   TODO ADD REASON  
  12.  *  
  13.  * @author   王涛  
  14.  * @version    
  15.  * @since    Ver 1.1  
  16.  * @Date     2010-11-24     上午10:25:18  
  17.  *  
  18.  */ 
  19. @Aspect 
  20. @Service 
  21. public class DemoAop {  
  22.     @Autowired 
  23.     public UserDAO userDao;  
  24.       
  25.     @After("execution(public * com.pdp.biz.service.usermanage.impl.UserManageServiceImpl.sayhi(..))")  
  26.     public void doAfter(JoinPoint jp) {  
  27.             System.out.println(userDao.findUsersCount(null));  
  28.             Object[] args = jp.getArgs();  
  29.             for(Object obj  : args){  
  30.                 System.out.println("参数值:"+obj);  
  31.             }  
  32.             System.out.println("后处理切入----------"+jp.getTarget().getClass().getName()+"----"+jp.getSignature().getName());  
  33.     }  

里面的注释分别是@Aspect用于告诉Spring这个是一个需要织入的类,

 

  1. @After("execution(public * com.pdp.biz.service.usermanage.impl.UserManageServiceImpl.sayhi(..))")  
  2.     public void doAfter(JoinPoint jp) { ... }

 

里面的doAfter方法上面有一行注释,指明这个方法将在UserManageServiceImpl.sayhi(..)方法运行结束之后来执行,参数JoinPoint主要携带了参数值和方法名什么的,到时候自己查查文档就ok了

 

org.aspectj.lang
Interface JoinPoint

All Known Subinterfaces:
ProceedingJoinPoint

public interface JoinPoint
 

 

Provides reflective access to both the state available at a join point and static information about it. This information is available from the body of advice using the special form thisJoinPoint. The primary use of this reflective information is for tracing and logging applications.

 aspect Logging {
     before(): within(com.bigboxco..*) && execution(public * *(..)) {
         System.err.println("entering: " + thisJoinPoint);
         System.err.println("  w/args: " + thisJoinPoint.getArgs());
         System.err.println("      at: " + thisJoinPoint.getSourceLocation());
     }
 }

Nested Class Summary
static interface JoinPoint.EnclosingStaticPart
           
static interface JoinPoint.StaticPart
          This helper object contains only the static information about a join point.
 
Field Summary
static java.lang.String ADVICE_EXECUTION
           
static java.lang.String CONSTRUCTOR_CALL
           
static java.lang.String CONSTRUCTOR_EXECUTION
           
static java.lang.String EXCEPTION_HANDLER
           
static java.lang.String FIELD_GET
           
static java.lang.String FIELD_SET
           
static java.lang.String INITIALIZATION
           
static java.lang.String METHOD_CALL
           
static java.lang.String METHOD_EXECUTION
          The legal return values from getKind()
static java.lang.String PREINITIALIZATION
           
static java.lang.String STATICINITIALIZATION
           
static java.lang.String SYNCHRONIZATION_LOCK
           
static java.lang.String SYNCHRONIZATION_UNLOCK
           
 
Method Summary
 java.lang.Object[] getArgs()
          Returns the arguments at this join point.
 java.lang.String getKind()
          Returns a String representing the kind of join point.
 Signature getSignature()
          Returns the signature at the join point.
 SourceLocation getSourceLocation()
          Returns the source location corresponding to the join point.
 JoinPoint.StaticPart getStaticPart()
          Returns an object that encapsulates the static parts of this join point.
 java.lang.Object getTarget()
           Returns the target object.
 java.lang.Object getThis()
           Returns the currently executing object.
 java.lang.String toLongString()
          Returns an extended string representation of the join point.
 java.lang.String toShortString()
          Returns an abbreviated string representation of the join point.
 java.lang.String toString()
           

运行的时候直接运行就ok了.

  1. @Test    
  2. public void testgetUsers(){  
  3.       userManageService.sayhi("Hi 大家好~!");