Redis分布式锁

在集群等多服务器（意味着多个jvm）中经常要使用到同步处理一下业务，这时普通的事务是满足不要业务需求，需要分布式锁。分布式锁的实现方式有多种，如redis实现分布式锁，zookeeper实现分布式锁等，这篇先实现redis分布式锁。

实现原理

1、通过setnx(lock_timeout)实现，如果设置了锁返回1，已经有值没有设置成功返回0。

2、死锁问题：通过时间来判断是否过期，如果已经过期，获取到过期时间get(lockKey)，然后getset(lock_timeout)判断是否和get相同，相同则证明已经加锁成功，因为可能会导致多个线程同时执行getset(lock_timeout)方法。这是可能导致多个线程都只需getset后，对于判断加锁成功的线程，再加expire(lockKey, LOCK_TIMEOUT, TimeUnit.MILLISECONDS)过期时间，防止多个线程同时叠加时间，导致锁时效时间翻倍。

3、针对集群服务器时间不一致问题，可以从调用redis的time()获取当前时间。

组件依赖

使用SpringBoot集成时的依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
      <version>1.5.4.RELEASE</version>
    </dependency>

使用Spring MVC(带有Spring Session Redis)时的依赖

    <dependency>
       <groupId>org.springframework.session</groupId>
       <artifactId>spring-session-data-redis</artifactId>
       <version>1.3.1.RELEASE</version>
   </dependency>

使用Spring MVC(不带有Spring Session Redis)时的依赖

    <dependency>  
      <groupId>org.springframework.data</groupId>  
      <artifactId>spring-data-redis</artifactId>  
      <version>1.0.2.RELEASE</version>  
    </dependency> 
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.9.0</version>
    </dependency>

代码实现

分布式锁接口

public interface DistributionLock {
    //加锁成功 返回加锁时间
    Long lock(String lockKey, String threadname);
    //解锁 需要更加加锁时间判断是否有权限
    void unlock(String lockKey, long lockvalue, String threadname);
}

分布式锁实现

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.util.concurrent.TimeUnit;

@Component
public class RedisDistributionLock implements DistributionLock {
    private static final long LOCK_TIMEOUT = 60 * 1000; //加锁超时时间 单位毫秒  意味着加锁期间内执行完操作 如果未完成会有并发现象

    private static final Logger LOG = Logger.getLogger(RedisDistributionLock.class); //redis锁日志


    private RedisTemplate<String, Object> redisTemplate;


    RedisDistributionLock(RedisTemplate<String, Object> redisTemplate){
        this.redisTemplate = redisTemplate;
    }

//    @SuppressWarnings("unchecked")
//    private static RedisTemplate<Serializable, Serializable> redisTemplate = (RedisTemplate<Serializable, Serializable>) SpringContextHolder
//            .getBean("redisTemplate");

    /**
     * 取到锁加锁 取不到锁一直等待直到获得锁
     */
    @Override
    public Long lock(String lockKey, String threadname) {
        LOG.info(threadname + "开始执行加锁");
        while (true) { //循环获取锁
            Long lock_timeout = currentTimeFromRedis() + LOCK_TIMEOUT + 1; //锁时间

            if (redisTemplate.execute(new RedisCallback<Boolean>() {
                @Override
                public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                    JdkSerializationRedisSerializer jdkSerializer = new JdkSerializationRedisSerializer();
                    byte[] value = jdkSerializer.serialize(lock_timeout);
                    return connection.setNX(lockKey.getBytes(), value);
                }
            })) { //如果加锁成功
                LOG.info(threadname + "加锁成功++++++++111111111");
                redisTemplate.expire(lockKey, LOCK_TIMEOUT, TimeUnit.MILLISECONDS); //设置超时时间，释放内存
                return lock_timeout;
            }else {
                Long current_lock_timeout_Str = (Long) get(lockKey); // redis里的时间
                if (current_lock_timeout_Str != null && current_lock_timeout_Str < currentTimeFromRedis()) { //锁已经失效
                    // 判断是否为空，不为空的情况下，说明已经失效，如果被其他线程设置了值，则第二个条件判断是无法执行

                    Long old_lock_timeout_Str = (Long) getAndSet(lockKey, lock_timeout);
                    // 获取上一个锁到期时间，并设置现在的锁到期时间
                    if (old_lock_timeout_Str != null && old_lock_timeout_Str.equals(current_lock_timeout_Str)) {
                        // 如过这个时候，多个线程恰好都到了这里，但是只有一个线程的设置值和当前值相同，他才有权利获取锁
                        LOG.info(threadname + "加锁成功+++++++2222222222");
                        redisTemplate.expire(lockKey, LOCK_TIMEOUT, TimeUnit.MILLISECONDS); //设置超时时间，释放内存
                        return lock_timeout;//返回加锁时间
                    }
                }
            }

            try {
                LOG.info(threadname +  "等待加锁，睡眠100毫秒");
                TimeUnit.MILLISECONDS.sleep(100);//睡眠100毫秒
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private Object get(final String key) {
        Object obj = null;
        try {
            obj = redisTemplate.execute(new RedisCallback<Object>() {
                @Override
                public Object doInRedis(RedisConnection connection) throws DataAccessException {
//                    StringRedisSerializer serializer = new StringRedisSerializer();
                    JdkSerializationRedisSerializer jdkSerializer = new JdkSerializationRedisSerializer();
                    byte[] data = connection.get(key.getBytes());
                    connection.close();
                    if (data == null) {
                        return null;
                    }
                    return jdkSerializer.deserialize(data);
                }
            });
        } catch (Exception e) {
            LOG.error("get redis error", e);
        }
        return obj;
    }

    private Object getAndSet(final String key, final Long value) {
        Object obj = null;
        try {
            obj = redisTemplate.execute(new RedisCallback<Object>() {
                @Override
                public Object doInRedis(RedisConnection connection) throws DataAccessException {
//                    StringRedisSerializer serializer = new StringRedisSerializer();
                    JdkSerializationRedisSerializer jdkSerializer = new JdkSerializationRedisSerializer();
                    byte[] ret = connection.getSet(key.getBytes(), jdkSerializer.serialize(value));
                    connection.close();
                    return jdkSerializer.deserialize(ret);
                }
            });
        } catch (Exception e) {
            LOG.error("setNX redis error", e);
        }
        return obj;
    }

    @Override
    public void unlock(String lockKey, long lockvalue, String threadname) {
        LOG.info(threadname + "执行解锁==========");//正常直接删除 如果异常关闭判断加锁会判断过期时间
        Long current_lock_timeout_Str = (Long) get(lockKey); // redis里的时间
        if (current_lock_timeout_Str != null && current_lock_timeout_Str == lockvalue) {//如果是加锁者 则删除锁 如果不是则等待自动过期 重新竞争加锁
            redisTemplate.delete(lockKey); //删除键
            LOG.info(threadname + "解锁成功-----------------");
        }
    }


    public long currentTimeFromRedis(){ //获取redis当前时间
        return redisTemplate.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.time();
            }
        });
    }
}

模拟测试

测试代码

    public void testRedisDistributionLock(){

        for (int i = 0; i < 20; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    String name = Thread.currentThread().getName();
                    Long locktime; //加锁时间
                    if ((locktime = distributionLock.lock("distribution123456", name)) != null) {
                        //开始执行任务
                        System.out.println(name + "任务执行中");
                        //任务执行完毕 关闭锁
                        distributionLock.unlock("distribution123456", locktime, name);
                    }
                }
            }).start();
        }

    }

测试结果

2018-02-06 12:13:20.946  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15开始执行加锁
2018-02-06 12:13:20.946  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18开始执行加锁
2018-02-06 12:13:20.946  INFO 11719 --- [      Thread-16] com.sn.RedisLock.RedisDistributionLock   : Thread-16开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21开始执行加锁
2018-02-06 12:13:20.946  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24开始执行加锁
2018-02-06 12:13:20.946  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23开始执行加锁
2018-02-06 12:13:20.948  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31开始执行加锁
2018-02-06 12:13:20.948  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25开始执行加锁
2018-02-06 12:13:20.948  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-26] com.sn.RedisLock.RedisDistributionLock   : Thread-26开始执行加锁
2018-02-06 12:13:20.947  INFO 11719 --- [      Thread-28] com.sn.RedisLock.RedisDistributionLock   : Thread-28开始执行加锁
2018-02-06 12:13:20.948  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30开始执行加锁
2018-02-06 12:13:20.948  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33开始执行加锁
2018-02-06 12:13:21.033  INFO 11719 --- [      Thread-16] com.sn.RedisLock.RedisDistributionLock   : Thread-16加锁成功++++++++111111111
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22等待加锁，睡眠100毫秒
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27等待加锁，睡眠100毫秒
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-28] com.sn.RedisLock.RedisDistributionLock   : Thread-28等待加锁，睡眠100毫秒
2018-02-06 12:13:21.037  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20等待加锁，睡眠100毫秒
2018-02-06 12:13:21.038  INFO 11719 --- [      Thread-26] com.sn.RedisLock.RedisDistributionLock   : Thread-26等待加锁，睡眠100毫秒
2018-02-06 12:13:21.038  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33等待加锁，睡眠100毫秒
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
Thread-16任务执行中
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-16] com.sn.RedisLock.RedisDistributionLock   : Thread-16执行解锁==========
2018-02-06 12:13:21.039  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.040  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18等待加锁，睡眠100毫秒
2018-02-06 12:13:21.040  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.040  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.040  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.041  INFO 11719 --- [      Thread-16] com.sn.RedisLock.RedisDistributionLock   : Thread-16解锁成功-----------------
2018-02-06 12:13:21.145  INFO 11719 --- [      Thread-28] com.sn.RedisLock.RedisDistributionLock   : Thread-28加锁成功++++++++111111111
2018-02-06 12:13:21.146  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22等待加锁，睡眠100毫秒
2018-02-06 12:13:21.147  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.147  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33等待加锁，睡眠100毫秒
Thread-28任务执行中
2018-02-06 12:13:21.147  INFO 11719 --- [      Thread-28] com.sn.RedisLock.RedisDistributionLock   : Thread-28执行解锁==========
2018-02-06 12:13:21.148  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.148  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34等待加锁，睡眠100毫秒
2018-02-06 12:13:21.148  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.149  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.150  INFO 11719 --- [      Thread-28] com.sn.RedisLock.RedisDistributionLock   : Thread-28解锁成功-----------------
2018-02-06 12:13:21.150  INFO 11719 --- [      Thread-26] com.sn.RedisLock.RedisDistributionLock   : Thread-26加锁成功++++++++111111111
Thread-26任务执行中
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-26] com.sn.RedisLock.RedisDistributionLock   : Thread-26执行解锁==========
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27等待加锁，睡眠100毫秒
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23等待加锁，睡眠100毫秒
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18等待加锁，睡眠100毫秒
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.151  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.152  INFO 11719 --- [      Thread-26] com.sn.RedisLock.RedisDistributionLock   : Thread-26解锁成功-----------------
2018-02-06 12:13:21.251  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33加锁成功++++++++111111111
2018-02-06 12:13:21.253  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22等待加锁，睡眠100毫秒
Thread-33任务执行中
2018-02-06 12:13:21.254  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33执行解锁==========
2018-02-06 12:13:21.254  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20等待加锁，睡眠100毫秒
2018-02-06 12:13:21.254  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.254  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23等待加锁，睡眠100毫秒
2018-02-06 12:13:21.254  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-33] com.sn.RedisLock.RedisDistributionLock   : Thread-33解锁成功-----------------
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.255  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18加锁成功++++++++111111111
2018-02-06 12:13:21.256  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27等待加锁，睡眠100毫秒
Thread-18任务执行中
2018-02-06 12:13:21.256  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18执行解锁==========
2018-02-06 12:13:21.257  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.257  INFO 11719 --- [      Thread-18] com.sn.RedisLock.RedisDistributionLock   : Thread-18解锁成功-----------------
2018-02-06 12:13:21.359  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20加锁成功++++++++111111111
2018-02-06 12:13:21.360  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23等待加锁，睡眠100毫秒
2018-02-06 12:13:21.360  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.360  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22等待加锁，睡眠100毫秒
2018-02-06 12:13:21.360  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
Thread-20任务执行中
2018-02-06 12:13:21.361  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.361  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20执行解锁==========
2018-02-06 12:13:21.361  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.362  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.362  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-20] com.sn.RedisLock.RedisDistributionLock   : Thread-20解锁成功-----------------
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.363  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.465  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22加锁成功++++++++111111111
Thread-22任务执行中
2018-02-06 12:13:21.466  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22执行解锁==========
2018-02-06 12:13:21.466  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.466  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-22] com.sn.RedisLock.RedisDistributionLock   : Thread-22解锁成功-----------------
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.468  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.469  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.469  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34加锁成功++++++++111111111
Thread-34任务执行中
2018-02-06 12:13:21.469  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34执行解锁==========
2018-02-06 12:13:21.470  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.470  INFO 11719 --- [      Thread-34] com.sn.RedisLock.RedisDistributionLock   : Thread-34解锁成功-----------------
2018-02-06 12:13:21.470  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.570  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23加锁成功++++++++111111111
Thread-23任务执行中
2018-02-06 12:13:21.571  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23执行解锁==========
2018-02-06 12:13:21.571  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24等待加锁，睡眠100毫秒
2018-02-06 12:13:21.572  INFO 11719 --- [      Thread-23] com.sn.RedisLock.RedisDistributionLock   : Thread-23解锁成功-----------------
2018-02-06 12:13:21.573  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27加锁成功++++++++111111111
Thread-27任务执行中
2018-02-06 12:13:21.574  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27执行解锁==========
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-27] com.sn.RedisLock.RedisDistributionLock   : Thread-27解锁成功-----------------
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30等待加锁，睡眠100毫秒
2018-02-06 12:13:21.575  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.576  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.676  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24加锁成功++++++++111111111
Thread-24任务执行中
2018-02-06 12:13:21.676  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24执行解锁==========
2018-02-06 12:13:21.677  INFO 11719 --- [      Thread-24] com.sn.RedisLock.RedisDistributionLock   : Thread-24解锁成功-----------------
2018-02-06 12:13:21.677  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17加锁成功++++++++111111111
Thread-17任务执行中
2018-02-06 12:13:21.678  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17执行解锁==========
2018-02-06 12:13:21.678  INFO 11719 --- [      Thread-17] com.sn.RedisLock.RedisDistributionLock   : Thread-17解锁成功-----------------
2018-02-06 12:13:21.681  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30加锁成功++++++++111111111
Thread-30任务执行中
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30执行解锁==========
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.682  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.683  INFO 11719 --- [      Thread-30] com.sn.RedisLock.RedisDistributionLock   : Thread-30解锁成功-----------------
2018-02-06 12:13:21.788  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21加锁成功++++++++111111111
Thread-21任务执行中
2018-02-06 12:13:21.789  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21执行解锁==========
2018-02-06 12:13:21.789  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.789  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.790  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.790  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31等待加锁，睡眠100毫秒
2018-02-06 12:13:21.790  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.790  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.790  INFO 11719 --- [      Thread-21] com.sn.RedisLock.RedisDistributionLock   : Thread-21解锁成功-----------------
2018-02-06 12:13:21.895  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31加锁成功++++++++111111111
Thread-31任务执行中
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31执行解锁==========
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25等待加锁，睡眠100毫秒
2018-02-06 12:13:21.896  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:21.897  INFO 11719 --- [      Thread-31] com.sn.RedisLock.RedisDistributionLock   : Thread-31解锁成功-----------------
2018-02-06 12:13:22.002  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25加锁成功++++++++111111111
Thread-25任务执行中
2018-02-06 12:13:22.002  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25执行解锁==========
2018-02-06 12:13:22.003  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15等待加锁，睡眠100毫秒
2018-02-06 12:13:22.003  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:22.003  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:22.003  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:22.003  INFO 11719 --- [      Thread-25] com.sn.RedisLock.RedisDistributionLock   : Thread-25解锁成功-----------------
2018-02-06 12:13:22.107  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15加锁成功++++++++111111111
Thread-15任务执行中
2018-02-06 12:13:22.108  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15执行解锁==========
2018-02-06 12:13:22.108  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:22.108  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:22.108  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19等待加锁，睡眠100毫秒
2018-02-06 12:13:22.109  INFO 11719 --- [      Thread-15] com.sn.RedisLock.RedisDistributionLock   : Thread-15解锁成功-----------------
2018-02-06 12:13:22.212  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19加锁成功++++++++111111111
Thread-19任务执行中
2018-02-06 12:13:22.212  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19执行解锁==========
2018-02-06 12:13:22.213  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:22.213  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29等待加锁，睡眠100毫秒
2018-02-06 12:13:22.213  INFO 11719 --- [      Thread-19] com.sn.RedisLock.RedisDistributionLock   : Thread-19解锁成功-----------------
2018-02-06 12:13:22.316  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29加锁成功++++++++111111111
Thread-29任务执行中
2018-02-06 12:13:22.317  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29执行解锁==========
2018-02-06 12:13:22.318  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32等待加锁，睡眠100毫秒
2018-02-06 12:13:22.318  INFO 11719 --- [      Thread-29] com.sn.RedisLock.RedisDistributionLock   : Thread-29解锁成功-----------------
2018-02-06 12:13:22.421  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32加锁成功++++++++111111111
Thread-32任务执行中
2018-02-06 12:13:22.421  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32执行解锁==========
2018-02-06 12:13:22.422  INFO 11719 --- [      Thread-32] com.sn.RedisLock.RedisDistributionLock   : Thread-32解锁成功-----------------

参考文章：

http://blog.csdn.net/fengshizty/article/details/53561562

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