5

为了使用 Spring AOP 实现 Logging,我遵循了这些简单的步骤。但它似乎不起作用。任何帮助都会很有用

1) 创建MyLoggingAspect

    import org.aspectj.lang.ProceedingJoinPoint;

public class MyLoggingAspect
{

    public MyLoggingAspect() {
        super();
        System.out.println("Instantiated MyLoggingAspect");     
    }

    public Object log(ProceedingJoinPoint call) throws Throwable
    {
        System.out.println("from logging aspect: entering method [" + call.toShortString()
                            +"] with param:"+call.getArgs()[0] );

        Object point =  call.proceed();

        System.out.println("from logging aspect: exiting method [" + call.toShortString()   
                            + "with return as:" +point);        

        return point;
    }

}

2)创建了一个我想要记录的类( TixServiceImpl )

public class TixServiceImpl implements TixService{

    @Override
    public void calculateSomething() {
        String s = "did some calculation..";
        System.out.println(s);
    }

    @Override
    public String getTixName() {
        return null;
    }
}

3)创建了一个spring-aspectj.xml文件

<beans...    
    <bean id="LoggingAspect"  class = "MyLoggingAspect"/>
    <aop:config>
          <aop:aspect ref="LoggingAspect">
             <aop:pointcut id="myCutLogging"
                    expression="execution(* TixService*.*(..))"/>
             <aop:around pointcut-ref="myCutLogging" method="log"/>
          </aop:aspect>
    </aop:config>    
</beans>

4)创建了一个简单的测试客户端(TixClient

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class TixClient {

    public static void main(String[] a){

        ApplicationContext context = new FileSystemXmlApplicationContext("conf/spring-aspectj.xml");

        TixService tix = new TixServiceImpl();
        tix.calculateSomething();
        String s = tix.getTixName();

        System.out.println("End of the the client invocation!!"); 
    }   
}

5)它给了我以下输出

...
Instantiated MyLoggingAspect
did some calculation..
End of the the client invocation!!
4

2 回答 2

16

我只是在检查您的代码,但我有一种预感,问题是您没有TixServiceImpl从 Spring 获取实例,而是您自己在TixClient. 我认为您TixService需要成为一个从 Spring ApplicationContext 获取的 Spring bean,以便 Spring 有机会在返回的实例上设置方面。

于 2009-01-18T20:46:14.080 回答
2

Scott Bale 是对的:让 spring 为您实例化 TixServiceImpl。同样在这种情况下,启用 Springs 日志记录可能会有所帮助,因为它会告诉您找到了多少个方面/服务的目标。

于 2009-01-18T21:23:36.767 回答