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!!");
    }
}