spingCloud基于redisTemplate的redis的分布式锁

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转载最新推荐文章于 2026-03-05 00:02:41 发布 1.9k 阅读 AI 写同款· GEO 优化 ›

之前用redisson来实现redis分布式锁（参考https://blog.youkuaiyun.com/lfwer/article/details/83901402），搭建起来比较麻烦，而且会有重复配置，偶尔看到一篇基于redisTemplate的redis的分布式锁的实现方式，试了试确实好用，因此转载过来。
原文地址：https://blog.youkuaiyun.com/qq_28397259/article/details/80839072?utm_source=blogkpcl13

核心代码

package com.chinaway.snow.config.redis;


import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.JedisCommands;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

/**
 * @author superchen
 * @since 2018/5/16
 **/
@Component
@Slf4j
public class RedisDistributedLock {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public static final String UNLOCK_LUA;

    static {
        StringBuilder sb = new StringBuilder();
        sb.append("if redis.call(\"get\",KEYS[1]) == ARGV[1] ");
        sb.append("then ");
        sb.append("    return redis.call(\"del\",KEYS[1]) ");
        sb.append("else ");
        sb.append("    return 0 ");
        sb.append("end ");
        UNLOCK_LUA = sb.toString();
    }


    public boolean setLock(String key, long expire) {
        try {
            RedisCallback<String> callback = (connection) -> {
                JedisCommands commands = (JedisCommands) connection.getNativeConnection();
                String uuid = UUID.randomUUID().toString();
                return commands.set(key, uuid, "NX", "PX", expire);
            };
            String result = stringRedisTemplate.execute(callback);

            return !StringUtils.isEmpty(result);
        } catch (Exception e) {
            log.error("set redis occured an exception", e);
        }
        return false;
    }

    public String get(String key) {
        try {
            RedisCallback<String> callback = (connection) -> {
                JedisCommands commands = (JedisCommands) connection.getNativeConnection();
                return commands.get(key);
            };
            String result = stringRedisTemplate.execute(callback);
            return result;
        } catch (Exception e) {
            log.error("get redis occured an exception", e);
        }
        return "";
    }

    public boolean releaseLock(String key, String requestId) {
        // 释放锁的时候，有可能因为持锁之后方法执行时间大于锁的有效期，此时有可能已经被另外一个线程持有锁，所以不能直接删除
        try {
            List<String> keys = new ArrayList<>();
            keys.add(key);
            List<String> args = new ArrayList<>();
            args.add(requestId);

            // 使用lua脚本删除redis中匹配value的key，可以避免由于方法执行时间过长而redis锁自动过期失效的时候误删其他线程的锁
            // spring自带的执行脚本方法中，集群模式直接抛出不支持执行脚本的异常，所以只能拿到原redis的connection来执行脚本
            RedisCallback<Long> callback = (connection) -> {
                Object nativeConnection = connection.getNativeConnection();
                // 集群模式和单机模式虽然执行脚本的方法一样，但是没有共同的接口，所以只能分开执行
                // 集群模式
                if (nativeConnection instanceof JedisCluster) {
                    return (Long) ((JedisCluster) nativeConnection).eval(UNLOCK_LUA, keys, args);
                }

                // 单机模式
                else if (nativeConnection instanceof Jedis) {
                    return (Long) ((Jedis) nativeConnection).eval(UNLOCK_LUA, keys, args);
                }
                return 0L;
            };
            Long result = stringRedisTemplate.execute(callback);

            return result != null && result > 0;
        } catch (Exception e) {
            log.error("release lock occured an exception", e);
        } finally {
            // 清除掉ThreadLocal中的数据，避免内存溢出
            //lockFlag.remove();
        }
        return false;
    }

}

加入依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-redis</artifactId>
</dependency>

初始化redis

application.properties

# Redis数据库索引（默认为0）
spring.redis.database=6
# Redis服务器地址
spring.redis.host=172.16.1.9
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空）
spring.redis.password=123456
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=500
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=5000
# 连接池中的最大空闲连接
spring.redis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.pool.min-idle=0
# 连接超时时间（毫秒）
spring.redis.timeout=0

RedisCacheConfig.java

import com.chinaway.snow.constant.RedisConstant;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.util.HashMap;
import java.util.Map;

/**
 * <P>Description: TODO</P>
 *
 * @author Asdpboy Yan  2018年3月1日 上午11:06:34
 * @ClassName: RedisCacheConfig
 * @see
 */

@Configuration
@EnableCaching
public class RedisCacheConfig extends CachingConfigurerSupport {

    //自定义缓存key生成策略
    @Bean
    public KeyGenerator keyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, java.lang.reflect.Method method, Object... params) {
                StringBuffer sb = new StringBuffer();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append("_" + obj.toString());
                }
                return sb.toString();
            }
        };
    }

    //缓存管理器
    @Bean
    public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        //设置默认缓存过期时间
        cacheManager.setDefaultExpiration(10000);

        Map<String, Long> expiresMap = new HashMap<>();
        //用户当前行程设置1小时过期
        expiresMap.put(RedisConstant.currentTravelsByDriverId, 3600L);
        //根据id获取行程详情设置1小时过期
        expiresMap.put(RedisConstant.detailTravelsById, 3600L);
        cacheManager.setExpires(expiresMap);

        return cacheManager;
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        setSerializer(template);//设置序列化工具
        template.afterPropertiesSet();
        return template;
    }

    private void setSerializer(StringRedisTemplate template) {
        @SuppressWarnings({"rawtypes", "unchecked"})
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
    }
}

使用

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import com.chinaway.snow.config.redis.RedisDistributedLock;
import com.chinaway.snow.dao.bill.BillTravelSalaryMapper;

import javax.annotation.PreDestroy;
import java.util.UUID;

/**
 * @Description:
 * @ClassName: DriverSalaryJob
 * @Author: Liu FangWei
 * @Date: 2018/12/23 14:18
 * @Version: 1.0
 */
@Component
@Slf4j
public class Test {

    @Autowired
    private RedisDistributedLock redisDistributedLock;

    private String requestId;

    private static final String key = "testKey";

    @Scheduled(cron = "0 */1 * * * ?")
    public void execute() {
        //获得锁
        boolean lockOk = redisDistributedLock.setLock(key, 3600000);
        try {
            if (lockOk) {
                Long start = System.currentTimeMillis();
                //记录当前锁对应的requestId
                requestId = redisDistributedLock.get(key);
                log.info("star test.");
                //业务代码，省略...
                log.info("end test,耗时:{}s", count, (System.currentTimeMillis() - start) / 1000);
            }
        } catch (Exception ex) {
            log.error("test error", ex);
        } finally {
            if (requestId != null)
                redisDistributedLock.releaseLock(key, requestId);
        }
    }

    //应用注销时需要删除key
    @PreDestroy
    public void destroy() {
        if (requestId != null)
            redisDistributedLock.releaseLock(key, requestId);
    }


}

就是这么简单，赶快来试试吧。

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