java代码redis分布式锁代码

以下是一份 Java 代码实现 Redis 分布式锁的示例：

import redis.clients.jedis.Jedis;
import java.util.Collections;

public class RedisDistributedLock {
    private static final String LOCK_SUCCESS = "OK";
    private static final String SET_IF_NOT_EXIST = "NX";
    private static final String SET_WITH_EXPIRE_TIME = "PX";
    private static final Long RELEASE_SUCCESS = 1L;

    /**
     * 尝试获取分布式锁
     * @param jedis Redis客户端
     * @param lockKey 锁
     * @param requestId 请求标识
     * @param expireTime 超期时间
     * @return 是否获取成功
     */
    public static boolean tryGetDistributedLock(Jedis jedis, String lockKey, String requestId, int expireTime) {
        String result = jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);
        if (LOCK_SUCCESS.equals(result)) {
            return true;
        }
        return false;
    }

    /**
     * 释放分布式锁
     * @param jedis Redis客户端
     * @param lockKey 锁
     * @param requestId 请求标识
     * @return 是否释放成功
     */
    public static boolean releaseDistributedLock(Jedis jedis, String lockKey, String requestId) {
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        Object result = jedis.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));
        if (RELEASE_SUCCESS.equals(result)) {
            return true;
        }
        return false;
    }
}

使用示例：

Jedis jedis = new Jedis("localhost");
String lockKey = "lockKey";
String requestId = String.valueOf(System.currentTimeMillis());
if (RedisDistributedLock.tryGetDistributedLock(jedis, lockKey, requestId, 10000)) {
    try {
        // do something
    } finally {
        RedisDistributedLock.releaseDistributedLock(jedis, lockKey, requestId);
    }
}

请注意，这仅仅是一个简单的 Redis 分布式锁的示例代码