java防止重复提交、防止重复点击

1.引入redis

<dependency> 

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-data-redis</artifactId>

</dependency>

2.yml配置

spring: 

 redis: 

     host: localhost

     port: 6379    

     password: 123456

3.自定义注解

import java.lang.annotation.*;

@Target({ElementType.METHOD})

@Retention(RetentionPolicy.RUNTIME)

@Documented

@Inherited

public @interface RedisLock {

    int expire() default 5;

}

4. 定义切面类

import com.alibaba.fastjson.JSONObject;

import com.google.common.collect.Lists;

import com.heshu.sz.blockchain.utonhsbs.common.utils.MyMD5Util;

import com.heshu.sz.blockchain.utonhsbs.common.utils.SecurityUtils;

import com.heshu.sz.blockchain.utonhsbs.common.utils.ip.IpUtils;

import com.heshu.sz.blockchain.utonhsbs.framework.interceptor.annotation.RedisLock;

import com.heshu.sz.blockchain.utonhsbs.framework.system.domain.BaseResult;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang3.StringUtils;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Pointcut;

import org.aspectj.lang.reflect.MethodSignature;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Configuration;

import org.springframework.data.redis.core.StringRedisTemplate;

import org.springframework.data.redis.core.script.DefaultRedisScript;

import org.springframework.data.redis.core.script.RedisScript;

import org.springframework.web.context.request.RequestAttributes;

import org.springframework.web.context.request.RequestContextHolder;

import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

import java.lang.reflect.Method;

import java.security.NoSuchAlgorithmException;

import java.util.ArrayList;

import java.util.List;

/**

* @author ：xx

* @description：

* @date ： 2022/7/1 9:41

*/

@Slf4j

@Aspect

@Configuration

public class RedisLockMethodInterceptor {

    @Value("${spring.profiles.active}")

    private String springProfilesActive;

    @Value("${spring.application.name}")

    private String springApplicationName;

    @Autowired

    private StringRedisTemplate stringRedisTemplate;

    @Pointcut("@annotation(com.heshu.sz.blockchain.utonhsbs.framework.interceptor.annotation.RedisLock)")

    public void point() {

    }

    @Around("point()")

    public Object doaround(ProceedingJoinPoint joinPoint) {

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();

        Method method = signature.getMethod();

        RedisLock localLock = method.getAnnotation(RedisLock.class);

        try {

            String lockUniqueKey = getLockUniqueKey(signature, joinPoint.getArgs());

            Integer expire = localLock.expire();

            if (expire < 0) {

                expire = 5;

            }

            ArrayList<String> keys = Lists.newArrayList(lockUniqueKey);

            String result = stringRedisTemplate.execute(setNxWithExpireTime, keys, expire.toString());

            if (!"ok".equalsIgnoreCase(result)) {//不存在

                return BaseResult.error("不允许重复提交，请稍后再试");

            }

            return joinPoint.proceed();

        } catch (Throwable throwable) {

            throw new RuntimeException(throwable.getMessage());

        }

    }

    /**

    * lua脚本

    */

    private RedisScript<String> setNxWithExpireTime = new DefaultRedisScript<>(

            "return redis.call('set', KEYS[1], 1, 'ex', ARGV[1], 'nx');",

            String.class

    );

    /**

    * 获取唯一标识key

    *

    * @param methodSignature

    * @param args

    * @return

    */

    private String getLockUniqueKey(MethodSignature methodSignature, Object[] args) throws NoSuchAlgorithmException {

        //请求uri, 获取类名称，方法名称

        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;

        HttpServletRequest request = servletRequestAttributes.getRequest();

//        HttpServletResponse responese = servletRequestAttributes.getResponse();

        //获取用户信息

        String userMsg = SecurityUtils.getUsername(); //获取登录用户名称

        //1.判断用户是否登录

        if (StringUtils.isEmpty(userMsg)) { //未登录用户获取真实ip

            userMsg = IpUtils.getIpAddr(request);

        }

        String hash = "";

        List list = new ArrayList();

        if (args.length > 0) {

            String[] parameterNames = methodSignature.getParameterNames();

            for (int i = 0; i < parameterNames.length; i++) {

                Object obj = args[i];

                list.add(obj);

            }

            String param = JSONObject.toJSONString(list);

            hash = MyMD5Util.getMD5(param);

        }

        //项目名称 + 环境编码 + 获取类名称 + 加密参数

        String key = "lock:" + springApplicationName + ":" + springProfilesActive + ":" + userMsg + ":" + request.getRequestURI();

        if (StringUtils.isNotEmpty(key)) {

            key = key + ":" + hash;

        }

        return key;

    }

5.调用

@RedisLock 

 public void save(@RequestBody User user) {

    }

文章来源：https://blog.csdn.net/qq_33454058/article/details/125516310?spm=1001.2014.3001.5506