Spring AOP自定义注解

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(value = {ElementType.TYPE, ElementType.METHOD})//使用位置（类，方法）
@Retention(RetentionPolicy.RUNTIME)//加载到jvm里运行
public @interface MyAspect {
    String value(); //注解的属性，如果只有一个属性，一般叫value
    String name() default ""; //属性，默认值""，可以不写
}

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

@Aspect//来定义一个切面
@Component
public class MyAspectAop {

    //定义切入点
    @Pointcut("@annotation(com....MyAspect)")
    public void auditAspect() {
        
    }

    //通知
    @Before("auditAspect()")
    public void doBefore(JoinPoint joinPoint) {
        System.out.println("触发到 @Before(\"auditAspect()\")");
    }

    /**
     * 后置通知  @Around环绕处理
     *
     * @param joinPoint 切点
     */
    @AfterReturning("auditAspect()")
    public void doAfrterReturning(JoinPoint joinPoint) {

        Object[] args = joinPoint.getArgs();
        System.out.println("触发 @AfterReturning(\"auditAspect()\")");
        System.out.println(args.length);
        getControllerMethodDescription(joinPoint);
    }

    /**
     * 获取注解中对方法的描述信息
     *
     * @param joinPoint 切点
     * @return 方法描述
     */
    public static void getControllerMethodDescription(JoinPoint joinPoint) {
        String targetName = joinPoint.getTarget().getClass().getName();    //获得执行方法的类名
        String methodName = joinPoint.getSignature().getName();            //获得执行方法的方法名
        Object[] arguments = joinPoint.getArgs();                          //获取切点方法的所有参数类型
        try {
            Class targetClass = Class.forName(targetName);

            Method[] methods = targetClass.getMethods();    //获取公共方法，不包括类私有的
            String value = "";
            String name = "";
            for (Method method : methods) {
                if (method.getName().equals(methodName)) {
                    Class[] clazzs = method.getParameterTypes();     //对比方法中参数的个数
                    if (clazzs.length == arguments.length) {
                        value = method.getAnnotation(MyAspect.class).value();
                        name = method.getAnnotation(MyAspect.class).name();
                        break;
                    }
                }
            }
            System.out.println("value=" + value);
            System.out.println("name=" + name);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

/**
     * 测试自定义注解
     */
    @MyAspect(value = "MyAspect", name = "name")
    @RequestMapping(value = "/add", method = RequestMethod.GET)
    public String add() {
        //获取本服务的信息
        ServiceInstance instance = client.getLocalServiceInstance();
        Integer r = 2;
        String info = "/add, host:" + instance.getHost() + ", service_id:" + instance.getServiceId() + "结果：" + r;
        logger.info(info);
        return info;
    }