spring自定义注解

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:context="http://www.springframework.org/schema/context"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">
     <aop:aspectj-autoproxy />

     <context:component-scan base-package="wjf.maven">
         <context:include-filter type="annotation"
             expression="org.aspectj.lang.annotation.Aspect" />
     </context:component-scan>
 </beans>

 package wjf.maven;

 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;

 @Documented
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.METHOD, ElementType.PARAMETER })
 public @interface DemoAnnotation {
     //定义注解里的参数，通过default指定默认值
     String desc() default "##########无描述信息##########";
 }

 package wjf.maven;

 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.Around;
 import org.aspectj.lang.annotation.Aspect;

 //定义一个切面
 @Aspect
 public class DemoProcess {

     @Around(value = "execution(* wjf.maven.*.*(..)) && @annotation(log)")
     public Object aroundMethod(ProceedingJoinPoint pjd, DemoAnnotation 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;
     }
 }

 package wjf.maven;

 import org.springframework.stereotype.Service;

 @Service
 public class AopTest {

     @DemoAnnotation(desc = "我是测试")
     public void test() {
         // System.out.println("hello world!!");
     }

     @DemoAnnotation
     public void test2() {
          System.out.println("hello world!!");
     }
 }