@PostMapping("/user/update")
@ApiOperation(value = "修改用戶信息", notes = "修改用戶信息", tags = "user module")
@AvoidReSubmit(expireTime = 1000 * 3)
public void update(@RequestBody User user){
 userMapper.updateById(user);
}

// 定義自定義注解，設(shè)置注解參數(shù)默認(rèn)值
package top.withu.gaof.freehope.annotate;

import java.lang.annotation.*;


/**
 * @author Gaofan
 * @date 2019年10月12日 下午2:54:45
 * @describe 防止重復(fù)提交
 */
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface AvoidReSubmit {

    /**
     * 失效時(shí)間，即可以第二次提交間隔時(shí)長(zhǎng)
     * @return
     */
    long expireTime() default 30 * 1000L;
}

// 定義切面進(jìn)行處理
package top.withu.gaof.freehope.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import top.withu.gaof.freehope.annotate.AvoidReSubmit;

import javax.annotation.Resource;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeUnit;

/**
 * @Description: TODO
 * @Author: gaofan
 * @Date: 2019/10/12 16:10
 * @Copyright: 2019 www.blog.freehope.top Inc. All rights reserved.
 **/
@Aspect
@Component
public class AvoidResumitAspect {

    @Resource
    private RedisTemplate redisTemplate;

    /**
     * 定義匹配規(guī)則，以便于后續(xù)攔截直接攔截submit方法，不用重復(fù)表達(dá)式
     */
    @Pointcut(value = "@annotation(top.withu.gaof.freehope.annotate.AvoidReSubmit)")
    public void submit() {
    }

    @Before("submit()&&@annotation(avoidReSubmit)")
    public void doBefore(JoinPoint joinPoint, AvoidReSubmit avoidReSubmit) {

        // 拼裝參數(shù)
        StringBuffer sb = new StringBuffer();
        for(Object object : joinPoint.getArgs()){
            sb.append(object);
        }

        String key = md5(sb.toString());
        long expireTime = avoidReSubmit.expireTime();
        ValueOperations valueOperations = redisTemplate.opsForValue();
        Object object = valueOperations.get(key);
        if(null != object){
            throw new RuntimeException("您已經(jīng)提交了請(qǐng)求，請(qǐng)不要重復(fù)提交哦！");
        }
        valueOperations.set(key, 1, expireTime, TimeUnit.MILLISECONDS);
    }

    @Around("submit()&&@annotation(avoidReSubmit)")
    public Object doAround(ProceedingJoinPoint proceedingJoinPoint, AvoidReSubmit avoidReSubmit) throws Throwable {
        System.out.println("環(huán)繞通知：");
        Object result = null;
        result = proceedingJoinPoint.proceed();
        return result;
    }

    @After("submit()")
    public void doAfter() {
        System.out.println("******攔截后的邏輯******");
    }

    private String md5(String str){
        if (str == null || str.length() == 0) {
            throw new IllegalArgumentException("String to encript cannot be null or zero length");
        }
        StringBuffer hexString = new StringBuffer();
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] hash = md.digest();
            for (int i = 0; i < hash.length; i++) {
                if ((0xff & hash[i]) < 0x10) {
                    hexString.append("0" + Integer.toHexString((0xFF & hash[i])));
                } else {
                    hexString.append(Integer.toHexString(0xFF & hash[i]));
                }
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return hexString.toString();
    }
}