Spring AOP 实现拦截Controller中的方法

因为Spring的Bean扫描和Spring-MVC的Bean扫描是分开的, 两者的Bean位于两个不同的Application, 而且Spring-MVC的Bean扫描要早于Spring的Bean扫描, 所以当Controller Bean生成完成后, 再执行Spring的Bean扫描,Spring会发现要被AOP代理的Controller Bean已经在容器中存在, 配置AOP就无效了。

同样这样的情况也存在于数据库事务中, 如果Service的Bean扫描配置在spring-mvc.xml中, 而数据库事务管理器配置在application.xml中, 会导致数据库事务失效, 原理一样。

所以这里 ,我们需要把AOP放置在Controller扫描配置的文件中。

Spring的配置文件application.xml 配置如下：

<context:component-scan base-package="cn.test.demo.dao" />
<context:component-scan base-package="cn.test.demo.service" />

Spring MVC的配置文件spring-mvc.xml

<context:component-scan base-package="cn.test.demo.controller" />
<context:component-scan base-package="cn.test.demo.aspect" />

<aop:aspectj-autoproxy>aop:aspectj-autoproxy>

@Aspect
@Component
public class LoggingAspect
{
    protected final org.slf4j.Logger log = LoggerFactory.getLogger(this.getClass());    

    /**
     * 配置切入的包名
     */
    @Pointcut("execution(* cn.test.demo.controller..*Controller*.*(..))")
    public void controllerMethod()
    {

    }

    @Around("controllerMethod()")
   public Object aroundControllerAdvice(ProceedingJoinPoint joinPoint)
   {    
     try
     {
         return joinPoint.proceed();
     } catch (Throwable throwable)
     {
        throwable.printStackTrace();
     }finally
     {
        try {           
            Signature signature = joinPoint.getSignature();
            if (signature != null) {
                String clazzName = signature.getDeclaringTypeName();
                String method = signature.getName();   
                log.info(clazzName,method);
             }
          } catch (Exception e) {
            log.error("aroundControllerAdvice", e);
         }
       }
       return null;
    }
    @AfterThrowing(value = "controllerMethod()", throwing = "exception")
    public void afterThrowing(JoinPoint joinPoint, Exception exception){
        Signature signature = joinPoint.getSignature();
        if (signature != null)
        {
            String clazzName = signature.getDeclaringTypeName();
            String method = signature.getName();
            String param =  methodParams(joinPoint, signature);
            log.error("{}.{}.({})",clazzName,method,param,exception);
        }
    }

    private String methodParams(JoinPoint pjp, Signature signature) {
        StringBuffer sb = new StringBuffer();
        try {
            CodeSignature cs = (CodeSignature) signature;
            String[] paramNames = cs.getParameterNames();
            Object[] paramValues = pjp.getArgs();

            for (int i = 0; i < paramNames.length; i++) {
                sb.append(paramNames[i]).append("=").append(toStr(paramValues[i]));
                if (i < paramNames.length - 1) {
                    sb.append(", ");
                }
            }
        } catch (Exception e) {
            log.error("error when generate method param info", e);
        }
        return sb.toString();
    }

    private String toStr(Object o) {
        if (o == null)
        {
            return "nil";
        }
        return o.toString();
    }


}