Spring AOP 实现自定义注解的示例

package cn.bridgeli.demo.annotation;
 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
/**
 * @author bridgeli
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyLog {
    /**
     * 方法描述
     *
     * @return
     */
    String desc() default "";
}

package cn.bridgeli.demo.annotation;
 
import cn.bridgeli.utils.AuthorizeUtil;
import cn.bridgeli.entity.Principal;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
 
/**
 * @author bridgeli
 * 1. 这是一个切面类
 */
@Aspect
@Component
@Slf4j
public class MyLogAspect {
 
    /**
     * 2. PointCut表示这是一个切点，@annotation表示这个切点切到一个注解上，后面带该注解的全类名
     * 切面最主要的就是切点，所有的故事都围绕切点发生
     * logPointCut()代表切点名称
     */
    @Pointcut("@annotation(cn.bridgeli.demo.annotation.MyLog)")
    public void logPointCut() {
    }
 
    /**
     * 3. 环绕通知
     *
     * @param joinPoint
     * @param myLog
     * @return
     */
    @Around(value = "logPointCut() && @annotation(myLog)", argNames = "joinPoint,myLog")
    public Object logAround(ProceedingJoinPoint joinPoint, MyLog myLog) {
        // 获取方法名
        String methodFullPathName = joinPoint.getTarget().getClass().getName() + "#" + joinPoint.getSignature().getName();
 
        // 获取参数
        String params = StringUtils.join(joinPoint.getArgs(), ";");
 
        Principal currentUser = AuthorizeUtil.getCurrentUser();
        log.info("当前登陆用户：" + (null == currentUser ? "" : currentUser.toString()) + "，进入 [ " + methodFullPathName + " ] 方法, 方法的描述：" + myLog.desc() + "，参数为:" + params);
 
        // 继续执行方法
        long startTime = System.currentTimeMillis();
        Object result = null;
        try {
            result = joinPoint.proceed();
        } catch (Throwable e) {
            log.error("切面执行报错，参数：" + params, e);
        }
        long elapsed = System.currentTimeMillis() - startTime;
 
        log.info("[ " + methodFullPathName + " ] 方法执行结束，返回值为：" + (null == result ? "" : result.toString()) + "，用时：" + elapsed);
 
        return result;
    }
}