Spring切面编程Aspect之@Before和@Around用法

查看dao层使用的sql

import java.util.Arrays;
import org.apache.commons.lang.ArrayUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class SqlAspect{

    /**
     * 查看执行的service层
     * @param pjp
     */
    @Before("execution(* com.gmtx.*.services.*.*(..))")
    public void beforeService(JoinPoint pjp){
        System.out.println("---Service层业务---"+CommonTool.getNowDateStr());
        System.err.println("  getTarget: " + pjp.getTarget().getClass());
        System.err.println("  toShortString: " + pjp.toShortString());
        System.err.println("  Args: " + Arrays.toString(pjp.getArgs()).toString());
    }

    /**
     * 查看执行的sql
     */
    @Before("execution(* com.gmtx.system.dao.CommonDao..*(..))")
    public void before(JoinPoint pjp){
        //打印参数
        System.out.println("-------------参数--------------"+CommonTool.getNowDateStr());
        Object[] argsObjects = pjp.getArgs();
        for (Object obj:argsObjects) {
            if(obj!=null&&obj.getClass().isArray()){  //如果是数组
                System.out.println(ArrayUtils.toString(obj));
            }else {
                System.out.println(obj);   //不是数组
            }
        }
    }

    /**
     * 查看sql执行时间
     */
    @Around("execution(* com.gmtx.system.dao.CommonDao..*(..))")   /*切点 - 有Tag标记的Method*/
    public Object around(ProceedingJoinPoint pjp) throws Throwable {    /*增强*/
        long s = System.currentTimeMillis();
        Object result = pjp.proceed();
        long e = System.currentTimeMillis();
        System.out.println("-------------时长--------------"+(e-s));
        return result;
    }

}

引用的jar包为aspectjrt.jar