redis加锁解锁

工具类

import org.apache.commons.lang.StringUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;


@Component
public class RedisLockCommon {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    
    /**
     * Redis加锁
     *
     * @param key
     * @param value
     * @return
     */
    public Boolean Lock(String key, String value) {
        if (stringRedisTemplate.opsForValue().setIfAbsent(key, value)) {
            return true;
        }
        String currentValue = stringRedisTemplate.opsForValue().get(key);
        if (StringUtils.isNotEmpty(currentValue) && Long.valueOf(currentValue) < System.currentTimeMillis()) {
            //上一次上锁时间，防止高并发情况下出现的被修改问题，到达线程安全
            String oldValue = stringRedisTemplate.opsForValue().getAndSet(key, value);
            if (StringUtils.isNotEmpty(oldValue) && oldValue.equals(currentValue)) {
                return true;
            }
        }
        return false;
    }


    /**
     * Redis解锁
     *
     * @param key
     * @param value
     */
    public void unlock(String key, String value) {
        String currentValue = stringRedisTemplate.opsForValue().get(key);
        try {
            if (StringUtils.isNotEmpty(currentValue) && currentValue.equals(value)) {
                stringRedisTemplate.opsForValue().getOperations().delete(key);
            }
        } catch (Exception e) {
        }
    }
}

用法

//redis判定是否可购买，并加入缓存
String key = "test";
long time = System.currentTimeMillis();
try {
    //加锁失败
    if (!redisLock.Lock(key, String.valueOf(time))) {
        return "加锁失败！！！";
    }
    //逻辑
} catch (Exception e) {
    e.printStackTrace();
} finally {
    //解锁
    redisLock.unlock(key, String.valueOf(time));
}