@AfterReturning配置

最新推荐文章于 2025-07-01 12:35:09 发布

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本文介绍如何利用AOP（面向切面编程）在Java应用程序中实现统一的权限验证和日志记录功能。通过具体的代码示例展示了Before、AfterReturning和Around通知的区别及用法，特别是AfterReturning如何获取被拦截方法的返回值。

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AfterReturning和before，after，around不同是可以获取织入函数的返回值，配置复杂一点。

如果切入点如下：

package com.leanyu.lcsystem.pointcut;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

/**
 * @author pandlvs
 *描述：切入点定义
 */
@Aspect
public class PointcutsDefinition 
{

	 public static final String ASPECT_SERVICE_EXCUTION = "execution(* com.leanyu.lcsystem.service.*.*(..))";
	 
	 /**
	  * 服务层的切入点
	  */
	 @Pointcut(ASPECT_SERVICE_EXCUTION)
	 public void inServiceLayer(){}
}

则around和AfterReturning的配置区别如下，注意AfterReturning配置必须有argNames参数，且参数值和returning值一样，这样在织入代码里面便可通过returning的值获取被织入函数的返回值。

package com.leanyu.lcsystem.permission.impl;

import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;

import com.leanyu.lcsystem.beans.UserBean;
import com.leanyu.lcsystem.permission.ICheckPermission;
import com.leanyu.lcsystem.service.log.SyslogService;
import com.leanyu.rpc.request.AbstractRequest;
import com.leanyu.rpc.response.ObjectResponse;
import com.leanyu.rpc.response.RpcResponse;
/**
 * @author pandlvs
 * 
 * 使用@Aspect 注解的类， Spring 将会把它当作一个特殊的Bean（一个切面），也就是 
 * 不对这个类本身进行动态代理 
 */  
@Aspect
public class PermissionInterceptor   
{
	private Logger logger = Logger.getLogger(PermissionInterceptor.class);
	
	@Autowired
	private ICheckPermission checkPermission;
	
	@Autowired
	private SyslogService syslogService;
	
	/**
	 * spring中Around通知  
	 * @param joinPoint
	 * @return
	 * @throws Throwable 
	 */
	@Around("com.leanyu.lcsystem.pointcut.PointcutsDefinition.inServiceLayer()")   
	public Object checkPermissionAround( ProceedingJoinPoint joinPoint )  
    {
		try
		{ 
			 Object[] args           = joinPoint.getArgs();
			 AbstractRequest request =  (AbstractRequest)args[0];
			 int userId          = request.getUserId();
			 String password     = request.getPassword();
			 Signature signature = joinPoint.getSignature();
			 String service      = signature.getDeclaringTypeName();
			 String method       = signature.getName();
			 			 
			 if ( checkPermission.hasServicePermission(userId, service , method , password) )
			 {
				 Object result = joinPoint.proceed( args );  
				 return result;
			 }
			 
		 }catch(Throwable e)
		 {
			 logger.error(e.toString(), e);
		 }
		 return null;
	}
	/**
	 * AfterReturning 三个参数必须有
	 * @param joinPoint
	 * @param retVal
	 */
	@SuppressWarnings("unchecked")
	@AfterReturning(value = "com.leanyu.lcsystem.pointcut.PointcutsDefinition.inServiceLayer()",argNames = "retVal",returning = "retVal")
	public void logInfo(JoinPoint joinPoint,Object retVal)
	{
		Object[] object = joinPoint.getArgs();
		
		if(object.length>1) return;
		
		int userId;
		if("logout".equals(joinPoint.getSignature().getName()) || 
			"login".equals(joinPoint.getSignature().getName())){
			
			if(((ObjectResponse<UserBean>)retVal).getErrorCode()!=0) return;
			
			userId = ((ObjectResponse<UserBean>)retVal).getData().getUserId();
			
		}else{
			if("query".equals(joinPoint.getSignature().getName().substring(0, 5))) return;
			if(((RpcResponse)retVal).getErrorCode()!=0) return;
			
			userId = ((AbstractRequest)object[0]).getUserId();
		}
		
		String action = joinPoint.getSignature().getName();
		String service = joinPoint.getSignature().getDeclaringTypeName();
		
		syslogService.addSyslog(userId, action, service);
	}
	 
}