Spring中自定义注解与AOP中获取注解

package me.lichunlong.spring.annotation;

import Java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
//自定义注解相关设置
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface LogAnnotation {
//自定义注解的属性，default是设置默认值
String desc() default "无描述信息";
}

package me.lichunlong.spring.service;
import me.lichunlong.spring.annotation.LogAnnotation;
import me.lichunlong.spring.jdbc.JdbcUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
//与其它注解一样的使用
@LogAnnotation(desc="this is UserService")
public void add() {
System.out.println("UserService add...");
}
}

//环绕通知：类似与动态代理的全过程
//携带参数ProceedingJoinPoint，且必须有返回值，即目标方法的返回
@Around(value = "execution(* me.lichunlong.spring.service.*.*(..)) && @annotation(log)")
public Object aroundMethod(ProceedingJoinPoint pjd, LogAnnotation log) {
Object result = null;
System.out.println(log.desc());
try {
System.out.println("前置通知");
result = pjd.proceed();
System.out.println("后置通知");
} catch (Throwable e) {
System.out.println("异常通知");
}
System.out.println("返回通知");
return result;
}