redis实现分布式锁及其不是完美解决方案原因解析(完美解决方案是redisson)（spring整合redis实现分布式锁）

spring整合redis并实现redis分布式锁：

1.引入jar包

spring相关jar包。

redis相关jar包：jedis-2.9.0.jar。

spring整合redis的jar包：spring-data-redis-2.1.0.RELEASE.jar

注意版本对应，否则可能出现问题。

2.spring配置：

applicationContext.xml：

<!-- 引入配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >
        <property name="locations">
            <list>
                <value>classpath:application.properties</value>
                <value>classpath:kafka/kafka.properties</value>
                <value>classpath:redis/redis.properties</value>
                <!-- <value>classpath:redis/spring_redis/redis.properties</value> -->
            </list>
        </property>
        <property name="ignoreUnresolvablePlaceholders" value="true" /> 
    </bean>

<import resource="redis/spring_redis/redis_single.xml"/>

redis_single.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:cache="http://www.springframework.org/schema/cache"
       xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/jdbc
    http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
    http://www.springframework.org/schema/cache
    http://www.springframework.org/schema/cache/spring-cache.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd">
    <!-- spring整合redis的配置：jedis2.8.1,spring-data-redis1.7.2 -->
    <!-- 读取配置文件信息 -->
    <!-- <context:property-placeholder location="classpath:redis.properties" file-encoding="UTF-8" ignore-unresolvable="true"/> -->
    <!-- Jedis 连接池配置 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="${redis.pool.maxTotal}"/> <!-- 控制一个pool可分配多少个jedis实例 -->
        <property name="maxIdle" value="${redis.pool.maxIdle}"/> <!-- 控制一个pool最多有多少个状态为idle(空闲)的jedis实例 -->
        <property name="maxWaitMillis" value="${redis.pool.maxWaitMillis}"/> <!-- 表示当borrow一个jedis实例时，最大的等待时间，如果超过等待时间，则直接抛出JedisConnectionException -->
        <property name="testOnBorrow" value="${redis.pool.testOnBorrow}"/> <!-- 在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的 -->
    </bean>
    
    <!-- 单机版 -->
    <bean id="standaloneConfig" class="org.springframework.data.redis.connection.RedisStandaloneConfiguration">
        <constructor-arg name="hostName" value="${jedis.host}"></constructor-arg>
        <constructor-arg name="port" value="${jedis.port}"></constructor-arg>
    </bean>
    <!-- <bean id="clientConfig" class="org.springframework.data.redis.connection.jedis.JedisClientConfiguration$DefaultJedisClientConfigurationBuilder" ="poolConfig">
        <property name="poolConfig" ref="poolConfig"></property>
    </bean> -->
    <bean id="clientConfig" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory$MutableJedisClientConfiguration" factory-method="create">
        <constructor-arg name="jedisPoolConfig" ref="poolConfig"/>
    </bean>
    <!-- 配置JedisConnectionFactory -->
    <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <constructor-arg name="standaloneConfig" ref="standaloneConfig"></constructor-arg>
        <constructor-arg name="clientConfig" ref="clientConfig"></constructor-arg>
    </bean>
    <!-- <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" ref="poolConfig" /> 
        <property name="port" value="${redis.port}" /> 
        <property name="hostName" value="${redis.host}" /> 
        <property name="password" value="${redis.pass}" /> 
    </bean> -->
    
    <!-- 集群版 -->
    <!-- spring整合redis -->
    <!-- org.springframework.data.redis.connection.RedisClusterConfiguration   -->
    <!-- <bean id="clusterConfig" class="org.springframework.data.redis.connection.RedisClusterConfiguration">
        <property name="maxRedirects" value="6"></property>
        <property name="clusterNodes">
            <set>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>127.0.0.1
                    <constructor-arg name="port" value="6379"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>
                    <constructor-arg name="port" value="6380"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>
                    <constructor-arg name="port" value="6381"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>
                    <constructor-arg name="port" value="6382"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>
                    <constructor-arg name="port" value="6383"></constructor-arg>
                </bean>
                <bean class="org.springframework.data.redis.connection.RedisNode">
                    <constructor-arg name="host" value="192.168.1.101"></constructor-arg>
                    <constructor-arg name="port" value="6384"></constructor-arg>
                </bean>
            </set>
        </property>
    </bean> -->
    <!-- 配置JedisConnectionFactory -->
    <!-- <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <constructor-arg name="clusterConfig" ref="clusterConfig"></constructor-arg>
        <constructor-arg name="poolConfig" ref="poolConfig"></constructor-arg>
    </bean> -->
    
    <!-- RedisTemplate使用的是JdkSerializationRedisSerializer,存入数据会将数据先序列化成字节数组然后在存入Redis数据库。  -->
    <!-- 存储序列化 -->
     <bean id="stringRedisSerializer"
       class="org.springframework.data.redis.serializer.StringRedisSerializer" />
    <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory"></property>
        <property name="keySerializer" ref="stringRedisSerializer"/>
            <property name="hashKeySerializer" ref="stringRedisSerializer"/>
    </bean>
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory"></property>
    </bean>
</beans>

redis.properties：

# 控制一个pool可分配多少个jedis实例
redis.pool.maxTotal=800
#redis.pool.maxTotal=3000
# 控制一个pool最多有多少个状态为idle(空闲)的jedis实例
redis.pool.maxIdle=100
# 表示当borrow一个jedis实例时，最大的等待时间，如果超过等待时间，则直接抛出JedisConnectionException
redis.pool.maxWaitMillis=50000
#redis.pool.maxWaitMillis=2000000
#在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的
#redis.pool.testOnBorrow=false
redis.pool.testOnBorrow=false

#redis.pool.active=300
#redis.pool.wait=10000
# redis 单机
# 单机 host
jedis.host=127.0.0.1
# 单机 port
jedis.port=64791

3.测试

redis分布式锁工具类：DistributedLockUtils2.java

package com.user.base.utils.redis;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.exceptions.JedisException;

/**
 * redis的分布式锁
 * 设计一个完美的redis分布式锁
 * 高并发环境下，任何一行代码都要再三斟酌，因为任何一行代码都可能出现并发问题。
 * @author Administrator
 */
@Component
public class DistributedLockUtils2 {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    private static DistributedLockUtils2 distributedLockUtil;
    //private static ThreadLocal threadLocal = new ThreadLocal<>();
    
    @PostConstruct //通过@PostConstruct实现初始化bean之前进行的操作
    public void init() {  
        distributedLockUtil = this;  
        distributedLockUtil.stringRedisTemplate = this.stringRedisTemplate;        
        // 初使化时将已静态化的testService实例化
    } 
    

    /**
     * 加锁
     * @param locaName  锁的key
     * @param acquireTimeout  获取超时时间
     * @param timeout   锁的超时时间
     * @return 锁标识
     */
    public static String lockWithTimeout(String localName,long timeout) {
//        Jedis conn = null;
        String retIdentifier = null;
        try {
            // 随机生成一个value
            String identifier = UUID.randomUUID().toString();
            // 锁名，即key值
            String lockKey = "lock:" + localName;
            /*
             * setnx:
             * 当往redis中存入一个值时,会先判断该值对应的key是否存在,如果存在则返回0,不存在返回1，存值。
             */
            // 优化：如果判断，设置值，设置过期不具备原子性，那么一旦服务器宕机，就会出现锁不释放，死锁。
            /*if(distributedLockUtil.stringRedisTemplate.opsForValue().get(lockKey)==null){
                // 优化：不能使用set，因为会覆盖。任何线程进来都能设置锁。将判断，设置值，和设置过期时间写在一起，改为原子性操作。
                distributedLockUtil.stringRedisTemplate.opsForValue().set(lockKey,identifier, lockExpire, TimeUnit.SECONDS);
                // 返回value值，用于释放锁时间确认
                retIdentifier = identifier;
                return retIdentifier;
            }*/
            // 底层也是用的setnx,判断，设置值，设置过期时间要是一个原子性操作，否则宕机会出现锁无法释放。
            // setIfAbsent(lockKey, identifier, timeout, TimeUnit.SECONDS)是原子命令。
//            if(distributedLockUtil.stringRedisTemplate.opsForValue().setIfAbsent(lockKey, identifier, timeout, TimeUnit.SECONDS)){
//                retIdentifier = identifier;
//                return retIdentifier;
//            }
            Long expireTime = System.currentTimeMillis() + 600*1000;
            while(System.currentTimeMillis() < expireTime){
//                System.out.println("i am in while");
                if(distributedLockUtil.stringRedisTemplate.opsForValue().setIfAbsent(lockKey, identifier, timeout, TimeUnit.SECONDS)){
                    retIdentifier = identifier;
                    return retIdentifier;
                }
            }
            // conn.setnx(lockKey, identifier) == 1,1表示key的值被设置成功，0代表key的值没有被设置。setnx(key,value).
            // System.out.println(RedisStirngUtils.setIfAbsent(lockKey, identifier));
            
            /*if (RedisStirngUtils.setIfAbsent(lockKey, identifier)) {
                distributedLockUtil.stringRedisTemplate.expire(lockKey, lockExpire, TimeUnit.SECONDS);
                // 返回value值，用于释放锁时间确认
                retIdentifier = identifier;
                return retIdentifier;
            }*/
            // 返回-1代表key没有设置超时时间，为key设置一个超时时间
            /*if (conn.ttl(lockKey) == -1) {
                conn.expire(lockKey, lockExpire);
            }*/
        } catch (JedisException e) {
            //e.printStackTrace();
        } finally {
//            if (conn != null) {
//                conn.close();
//            }
        }
        return retIdentifier;
    }

    /**
     * 释放锁
     * @param lockName 锁的key
     * @param identifier    释放锁的标识
     * @return
     */
    public static void releaseLock(String lockName,String identifier) {
        // 优化：如果说哪个小白没有上锁，而是直接调用了releaseLock，那么可能会误删锁，所以需要根据uuid判断是否释放自己上的锁。
        // 锁名，即key值
        String lockKey = "lock:" + lockName;
        /*
         * 优化：假如没有用uuid判断，那么在A线程业务执行时间较长，此时锁过期释放，B线程设置获取锁，此时切换到A线程执行到delete，会把B线程的锁误删。
         * 如果并发量较小，可能没什么问题。如果并发量较大就会出现如上问题。
         */
        /*
         * 优化：判断和删除不是一个原子性操作，如果A线程判断刚进来，锁刚好过期，然后B线程执行上锁成功，此时切换到A线程执行删除锁，会把B线程的锁误删。
         * 这种情况出现的概率很小，但是在极端高并发情况下很可能会出现。
         * 解决方案：锁续命。开启一个线程监听(看门狗watch dog)，如果线程没有执行完，那么就把锁续命，延长过期时间。
         * 市面上有完善的解决方案redission。底层跟先有代码逻辑一样，只不过多了续命，解决了现有代码逻辑中释放锁中判断和删除的非原子性的问题。
         * redission底层使用lua脚本，redis支持lua脚本。
         * redission解决了过期时间过期后，锁释放导致误删其他线程加的锁。
         * redission放心去用，互联网公司都是这么用的。
         */
        // 根据uuid只能释放自己的锁。
        // 超时时间就是解决宕机导致锁无法释放的问题。
        // 优化：如果在超时时间内业务没有完成，需要锁续命。
        if(identifier.equals(distributedLockUtil.stringRedisTemplate.opsForValue().get(lockKey))){
            // 此时A线程锁过期，B线程加锁，切换A线程执行delete会把线程B的锁删除。
            // 但是此时如果有B新增锁，A又删除锁。？？？？
            distributedLockUtil.stringRedisTemplate.delete(lockKey);
        }
    }
}

SecondKillService.java：

package com.user.service.redis;

public interface SecondKillService {
    public void seckill();
}

SecondKillServiceImp.java：

package com.user.service.redis;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang3.StringUtils;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.user.base.utils.redis.DistributedLockUtils;
import com.user.base.utils.redis.DistributedLockUtils2;
import com.user.base.utils.redis.redisson.RedissonConfig;

@Service
public class SecondKillServiceImp implements SecondKillService{
    @Autowired
    private RedissonClient redissonClient;
    private static int count = 2000;
    public static List<Integer> list = new ArrayList<>();
    
    @Override
    public void seckill() {
//        count = count - 1;
//        list.add(count);
//        System.out.println(Thread.currentThread().getName() + "秒杀操作,singleRedis," + "剩余数量：" + count);
        // 可以防止重复提交的数据。
        String uuid = DistributedLockUtils2.lockWithTimeout("test", 10);
        // 上锁，如果锁一直保持，其他线程无法操作，只有过期或者主动释放锁。
        if(StringUtils.isNotEmpty(uuid)){
            try {
                count = count - 1;
                list.add(count);
                System.out.println(Thread.currentThread().getName() + "秒杀操作,singleRedis," + "剩余数量：" + count);
            } catch (Exception e) {
                //e.printStackTrace();
            } finally {
                // 如果业务代码出现异常了，不在finally中执行释放锁的操作，也会导致锁无法释放。
                DistributedLockUtils2.releaseLock("test",uuid);
            }
        }else{
            System.out.println("获取锁超时！");
        }
    }
    
//    @Override
//    public void seckill() {
//        RLock redissonLock = redissonClient.getLock("test");
//        // 相当于distributedLockUtil.stringRedisTemplate.opsForValue().setIfAbsent(lockKey, identifier, timeout, TimeUnit.SECONDS)
//        redissonLock.lock();
//        try {
//            count = count - 1;
//            list.add(count);
//            System.out.println(Thread.currentThread().getName() + "秒杀操作,clusterRedis," + "剩余数量：" + count);
//        } catch (Exception e) {
//            e.printStackTrace();
//        } finally {
//            // 相当于distributedLockUtil.stringRedisTemplate.delete(lockKey);
//            /*
//             * 由于开启了watchdog看门狗线程监听，所以线程执行完之前不会出现：A线程锁过期时间过期，此时B线程设置锁，然后又切换到A线程删锁，误删B线程的锁。
//             * 因为A线程执行完之前，A线程的锁会一直续命，不会过期。所以A线程在delete锁之前，会一直持有锁。
//             * 如果服务器非宕机情况，那么锁会一直续命，A线程一直持有锁。最终都会执行到finally释放锁。
//             * 如果中间出现宕机，那么锁不会续命，到了过期时间就会过期。锁自动释放。
//             * 因此不会出现锁无法释放，死锁的情况。
//             * 
//             * 自己写续命比较麻烦，而且容易出错。redisson是个很好的框架和解决方案。
//             */
//            redissonLock.unlock();
//        }
//    }
}

多线程类：SecondKillThread.java

package com.user.service.redis;

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

@Component
public class SecondKillThread implements Runnable{
    @Autowired
    private SecondKillService secondKillService;
    
    @Override
    public void run() {
        secondKillService.seckill();
    }
}

测试类：RedisDistributedLockTest.java

package com.user.test.spring_redis;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.user.service.redis.SecondKillService;
import com.user.service.redis.SecondKillServiceImp;
import com.user.service.redis.SecondKillThread;

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration({"classpath:applicationContext.xml"})
public class RedisDistributedLockTest extends AbstractJUnit4SpringContextTests{
    @Autowired
    private SecondKillService secondKillService;
    @Autowired
    private SecondKillThread secondKillThread;
    
    /**
     * 模拟秒杀
     */
    @Test
    public void secKill(){
        System.out.println("秒杀活动开始---");
        try {
            for(int i=0;i<2000;i++){
                new Thread(secondKillThread,"Thread" + i).start();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            Thread.sleep(30000);
        } catch (InterruptedException e1) {
            e1.printStackTrace();
        }
        System.out.println(SecondKillServiceImp.list);
        Set set = new HashSet();
        for(int i : SecondKillServiceImp.list){
            int count = 0;
            for(int j : SecondKillServiceImp.list){
                if(i == j){
                    count = count + 1;
                }
            }
            if(count > 1){
                set.add(i);
            }
        }
        if(set != null && set.size() > 0){
//            Iterator it = set.iterator();
//            while(it.hasNext()){
//                System.out.println(it.next());
//            }
            System.out.println(set);
        }else{
            System.out.println("没有重复的记录！");
        }
    }
}

4.结果：

1.没有使用redis分布式锁：

消费列表：

[1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990, 1989, 1988, 1987, 1986, 1985, 1984, 1983, 1982, 1981, 1980, 1979, 1978, 1977, 1976, 1975, 1974, 1973, 1972, 1971, 1970, 1969, 1968, 1967, 1966, 1965, 1964, 1963, 1962, 1961, 1960, 1959, 1958, 1957, 1956, 1955, 1954, 1953, 1951, 1950, 1949, 1952, 1948, 1947, 1946, 1945, 1944, 1943, 1942, 1941, 1940, 1939, 1938, 1937, 1936, 1935, 1934, 1933, 1932, 1931, 1930, 1929, 1928, 1927, 1926, 1925, 1924, 1923, 1922, 1921, 1920, 1919, 1918, 1917, 1916, 1915, 1914, 1913, 1912, 1911, 1910, 1909, 1908, 1907, 1906, 1905, 1904, 1903, 1902, 1901, 1900, 1899, 1898, 1897, 1896, 1895, 1894, 1893, 1892, 1891, 1890, 1889, 1888, 1887, 1886, 1885, 1884, 1883, 1882, 1881, 1880, 1879, 1878, 1877, 1876, 1875, 1874, 1873, 1872, 1871, 1870, 1869, 1868, 1867, 1866, 1865, 1864, 1863, 1862, 1861, 1860, 1859, 1858, 1857, 1856, 1855, 1854, 1853, 1852, 1851, 1850, 1849, 1848, 1847, 1846, 1845, 1844, 1843, 1842, 1841, 1840, 1839, 1838, 1837, 1836, 1835, 1834, 1833, 1832, 1831, 1830, 1829, 1828, 1827, 1826, 1825, 1824, 1823, 1822, 1821, 1820, 1819, 1818, 1817, 1816, 1815, 1814, 1813, 1812, 1811, 1810, 1809, 1808, 1807, 1806, 1805, 1804, 1803, 1802, 1801, 1800, 1799, 1798, 1797, 1796, 1795, 1794, 1793, 1792, 1791, 1790, 1789, 1788, 1787, 1786, 1785, 1784, 1783, 1782, 1781, 1780, 1779, 1778, 1777, 1776, 1775, 1774, 1773, 1772, 1771, 1770, 1769, 1768, 1767, 1766, 1765, 1764, 1763, 1762, 1761, 1760, 1759, 1758, 1757, 1756, 1755, 1754, 1753, 1752, 1751, 1750, 1749, 1748, 1747, 1746, 1745, 1744, 1743, 1742, 1741, 1740, 1739, 1738, 1737, 1736, 1735, 1734, 1733, 1732, 1731, 1730, 1729, 1728, 1727, 1726, 1725, 1724, 1723, 1722, 1721, 1720, 1719, 1718, 1717, 1716, 1715, 1714, 1713, 1712, 1711, 1710, 1709, 1708, 1707, 1706, 1705, 1704, 1703, 1702, 1701, 1700, 1699, 1698, 1697, 1696, 1695, 1694, 1693, 1692, 1691, 1690, 1689, 1688, 1687, 1686, 1685, 1684, 1683, 1682, 1681, 1680, 1679, 1678, 1677, 1676, 1675, 1674, 1673, 1672, 1671, 1670, 1669, 1668, 1667, 1666, 1665, 1664, 1663, 1662, 1661, 1660, 1659, 1658, 1657, 1656, 1655, 1654, 1653, 1652, 1651, 1650, 1649, 1648, 1647, 1646, 1645, 1644, 1643, 1642, 1641, 1640, 1639, 1638, 1637, 1636, 1635, 1634, 1633, 1632, 1631, 1630, 1629, 1628, 1627, 1626, 1625, 1624, 1623, 1622, 1621, 1620, 1619, 1618, 1617, 1616, 1615, 1614, 1613, 1612, 1611, 1610, 1609, 1608, 1607, 1606, 1605, 1604, 1603, 1602, 1601, 1600, 1599, 1598, 1597, 1596, 1595, 1594, 1593, 1592, 1591, 1590, 1589, 1588, 1587, 1586, 1585, 1584, 1583, 1582, 1581, 1580, 1579, 1578, 1577, 1576, 1575, 1574, 1573, 1572, 1571, 1570, 1569, 1568, 1567, 1566, 1565, 1564, 1563, 1562, 1561, 1560, 1559, 1558, 1557, 1556, 1555, 1554, 1553, 1552, 1551, 1550, 1549, 1548, 1547, 1546, 1545, 1544, 1543, 1542, 1541, 1540, 1539, 1538, 1537, 1536, 1535, 1534, 1533, 1532, 1531, 1530, 1529, 1528, 1527, 1526, 1525, 1524, 1523, 1522, 1521, 1520, 1519, 1518, 1517, 1516, 1515, 1514, 1513, 1512, 1511, 1510, 1509, 1508, 1507, 1506, 1505, 1504, 1503, 1502, 1501, 1500, 1499, 1498, 1497, 1496, 1495, 1494, 1493, 1492, 1491, 1490, 1489, 1488, 1487, 1486, 1485, 1484, 1483, 1482, 1481, 1480, 1479, 1478, 1477, 1476, 1475, 1474, 1473, 1472, 1471, 1470, 1469, 1468, 1467, 1466, 1465, 1464, 1463, 1462, 1461, 1460, 1458, 1459, 1457, 1456, 1455, 1454, 1453, 1452, 1451, 1450, 1449, 1448, 1447, 1446, 1445, 1444, 1443, 1442, 1441, 1440, 1439, 1438, 1437, 1436, 1435, 1434, 1433, 1432, 1431, 1430, 1429, 1428, 1427, 1426, 1425, 1424, 1423, 1422, 1421, 1420, 1419, 1418, 1417, 1416, 1415, 1414, 1413, 1412, 1411, 1410, 1409, 1408, 1407, 1406, 1405, 1404, 1403, 1402, 1401, 1400, 1399, 1398, 1397, 1396, 1395, 1394, 1393, 1392, 1391, 1390, 1389, 1388, 1387, 1386, 1385, 1384, 1383, 1382, 1381, 1380, 1379, 1378, 1377, 1376, 1375, 1374, 1373, 1372, 1371, 1370, 1369, 1368, 1367, 1366, 1365, 1364, 1363, 1362, 1361, 1360, 1359, 1358, 1357, 1356, 1355, 1354, 1353, 1352, 1351, 1350, 1349, 1348, 1347, 1346, 1345, 1344, 1343, 1342, 1341, 1340, 1339, 1338, 1337, 1336, 1335, 1334, 1333, 1332, 1331, 1330, 1329, 1328, 1327, 1326, 1325, 1324, 1323, 1322, 1321, 1320, 1319, 1318, 1317, 1316, 1315, 1314, 1313, 1312, 1311, 1310, 1309, 1308, 1307, 1306, 1305, 1304, 1303, 1302, 1301, 1300, 1299, 1298, 1297, 1296, 1295, 1294, 1293, 1292, 1291, 1290, 1289, 1288, 1287, 1286, 1285, 1284, 1283, 1282, 1281, 1280, 1279, 1278, 1277, 1276, 1275, 1274, 1273, 1272, 1271, 1270, 1269, 1268, 1267, 1266, 1265, 1264, 1263, 1262, 1261, 1260, 1259, 1258, 1257, 1256, 1255, 1254, 1253, 1252, 1251, 1250, 1251, 1250, 1249, 1248, 1247, 1246, 1245, 1244, 1243, 1242, 1241, 1240, 1239, 1238, 1237, 1236, 1235, 1234, 1233, 1232, 1231, 1230, 1229, 1228, 1227, 1226, 1225, 1224, 1223, 1222, 1221, 1220, 1219, 1218, 1217, 1216, 1215, 1214, 1213, 1212, 1211, 1210, 1209, 1208, 1207, 1206, 1205, 1204, 1203, 1202, 1201, 1200, 1199, 1198, 1197, 1196, 1195, 1194, 1193, 1192, 1191, 1190, 1189, 1188, 1187, 1186, 1185, 1184, 1183, 1182, 1181, 1180, 1179, 1178, 1177, 1176, 1175, 1174, 1173, 1172, 1171, 1170, 1169, 1168, 1167, 1166, 1165, 1164, 1163, 1162, 1161, 1160, 1159, 1158, 1157, 1156, 1155, 1154, 1153, 1152, 1151, 1150, 1149, 1148, 1147, 1146, 1145, 1144, 1143, 1142, 1141, 1140, 1139, 1138, 1137, 1136, 1135, 1134, 1133, 1132, 1131, 1130, 1129, 1128, 1127, 1126, 1125, 1124, 1123, 1122, 1121, 1120, 1119, 1118, 1117, 1116, 1115, 1114, 1113, 1112, 1111, 1110, 1109, 1108, 1107, 1106, 1105, 1104, 1103, 1102, 1101, 1100, 1099, 1098, 1097, 1096, 1095, 1094, 1093, 1092, 1091, 1090, 1089, 1088, 1087, 1086, 1085, 1084, 1083, 1082, 1081, 1080, 1079, 1078, 1077, 1076, 1075, 1074, 1073, 1072, 1071, 1070, 1069, 1068, 1067, 1066, 1065, 1064, 1063, 1062, 1061, 1060, 1059, 1058, 1057, 1056, 1055, 1054, 1053, 1052, 1051, 1050, 1049, 1048, 1047, 1046, 1045, 1044, 1043, 1042, 1041, 1040, 1039, 1038, 1037, 1036, 1035, 1034, 1033, 1032, 1031, 1030, 1029, 1028, 1027, 1026, 1025, 1024, 1023, 1022, 1021, 1020, 1019, 1018, 1017, 1016, 1015, 1014, 1013, 1012, 1011, 1010, 1009, 1008, 1007, 1006, 1005, 1004, 1003, 1002, 1001, 1000, 999, 998, 997, 996, 995, 994, 993, 992, 991, 990, 989, 988, 987, 986, 985, 984, 983, 982, 981, 980, 979, 978, 977, 976, 975, 974, 973, 972, 971, 970, 969, 968, 967, 966, 965, 964, 963, 962, 961, 960, 959, 958, 957, 956, 955, 954, 953, 952, 951, 950, 949, 948, 947, 946, 945, 944, 943, 942, 941, 940, 939, 938, 937, 936, 935, 934, 933, 932, 931, 930, 929, 928, 927, 926, 925, 924, 923, 922, 921, 920, 919, 918, 917, 916, 915, 914, 913, 912, 911, 910, 909, 908, 907, 906, 905, 904, 903, 902, 901, 900, 899, 898, 897, 896, 895, 894, 893, 892, 891, 890, 889, 888, 887, 886, 885, 884, 883, 882, 881, 880, 879, 878, 877, 876, 875, 874, 873, 872, 871, 870, 869, 868, 867, 866, 865, 864, 863, 862, 861, 860, 859, 858, 857, 856, 855, 854, 853, 852, 851, 850, 849, 848, 847, 846, 845, 844, 843, 842, 841, 840, 839, 838, 837, 836, 835, 834, 833, 832, 831, 830, 829, 828, 827, 826, 825, 824, 823, 822, 821, 820, 819, 818, 817, 816, 815, 814, 813, 812, 811, 810, 809, 808, 807, 806, 805, 804, 803, 802, 801, 800, 799, 798, 797, 796, 795, 794, 793, 792, 791, 790, 789, 788, 787, 786, 785, 784, 783, 782, 781, 780, 779, 778, 777, 776, 775, 774, 773, 772, 771, 770, 769, 768, 767, 766, 765, 764, 763, 762, 761, 760, 759, 758, 757, 756, 755, 754, 753, 752, 751, 750, 749, 748, 747, 746, 745, 744, 743, 742, 741, 740, 739, 738, 737, 736, 735, 734, 733, 732, 731, 730, 729, 728, 727, 726, 725, 724, 723, 722, 721, 720, 719, 718, 717, 716, 715, 714, 713, 712, 711, 710, 709, 708, 707, 706, 705, 704, 703, 702, 701, 700, 699, 698, 697, 696, 695, 694, 693, 692, 691, 690, 689, 688, 687, 686, 685, 684, 683, 682, 681, 680, 679, 678, 677, 676, 675, 674, 673, 672, 671, 670, 669, 668, 667, 666, 665, 664, 663, 662, 661, 660, 659, 658, 657, 656, 655, 654, 653, 652, 651, 650, 649, 648, 647, 646, 645, 644, 643, 642, 641, 640, 639, 638, 637, 636, 635, 634, 633, 632, 631, 630, 629, 628, 627, 626, 625, 624, 623, 622, 621, 620, 619, 618, 617, 616, 615, 614, 613, 612, 611, 610, 609, 608, 607, 606, 605, 604, 603, 602, 601, 600, 599, 598, 597, 596, 595, 594, 593, 592, 591, 590, 589, 588, 587, 586, 585, 584, 583, 582, 581, 580, 579, 578, 577, 576, 575, 574, 573, 572, 571, 570, 569, 568, 567, 566, 565, 564, 563, 562, 561, 560, 559, 558, 557, 556, 555, 554, 553, 552, 551, 550, 549, 548, 547, 546, 545, 544, 543, 542, 541, 540, 539, 538, 537, 536, 535, 534, 533, 532, 531, 530, 529, 528, 527, 526, 525, 524, 523, 522, 521, 520, 519, 518, 517, 516, 515, 514, 513, 512, 511, 510, 509, 508, 507, 506, 505, 504, 503, 502, 501, 500, 499, 498, 497, 496, 495, 494, 493, 492, 491, 490, 489, 488, 487, 486, 485, 484, 483, 482, 481, 480, 479, 478, 477, 476, 475, 474, 473, 472, 471, 470, 469, 468, 467, 466, 465, 464, 463, 462, 461, 460, 459, 458, 457, 456, 455, 454, 453, 452, 451, 450, 449, 448, 447, 446, 445, 444, 443, 442, 441, 440, 439, 438, 437, 436, 435, 434, 433, 432, 431, 430, 429, 428, 427, 426, 425, 424, 423, 422, 421, 420, 419, 418, 417, 416, 415, 414, 413, 412, 411, 410, 409, 408, 407, 406, 405, 404, 403, 402, 401, 400, 399, 398, 397, 396, 395, 394, 393, 392, 391, 390, 389, 388, 387, 386, 385, 384, 383, 382, 381, 380, 379, 378, 377, 376, 375, 374, 373, 372, 371, 370, 369, 368, 367, 366, 365, 364, 363, 362, 361, 360, 359, 358, 357, 356, 355, 354, 353, 352, 351, 350, 349, 348, 347, 346, 345, 344, 343, 342, 341, 340, 339, 338, 337, 336, 335, 334, 333, 332, 331, 330, 329, 328, 327, 326, 325, 324, 323, 322, 321, 320, 319, 318, 317, 316, 315, 314, 313, 312, 311, 310, 309, 308, 307, 306, 305, 304, 303, 302, 301, 300, 299, 298, 297, 296, 295, 294, 293, 292, 291, 290, 289, 288, 287, 286, 285, 284, 283, 282, 281, 280, 279, 278, 277, 276, 275, 274, 273, 272, 271, 270, 269, 268, 267, 266, 265, 264, 263, 262, 261, 260, 259, 258, 257, 256, 255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240, 239, 238, 237, 236, 235, 234, 233, 232, 231, 230, 229, 228, 227, 226, 225, 224, 223, 222, 221, 220, 219, 218, 217, 216, 215, 214, 213, 212, 211, 210, 209, 208, 207, 206, 205, 204, 203, 202, 201, 200, 199, 198, 197, 196, 195, 194, 193, 192, 191, 190, 189, 188, 187, 186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176, 175, 174, 173, 172, 171, 170, 169, 168, 167, 166, 165, 164, 163, 162, 161, 160, 159, 158, 157, 156, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 128, 127, 126, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113, 112, 111, 110, 109, 108, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2]

重复消费列表：

[1250, 1251]

运行多次，大部分都会出现重复消费，线程不安全。

2.使用redis分布式锁：

消费列表：

[1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 1990, 1989, 1988, 1987, 1986, 1985, 1984, 1983, 1982, 1981, 1980, 1979, 1978, 1977, 1976, 1975, 1974, 1973, 1972, 1971, 1970, 1969, 1968, 1967, 1966, 1965, 1964, 1963, 1962, 1961, 1960, 1959, 1958, 1957, 1956, 1955, 1954, 1953, 1952, 1951, 1950, 1949, 1948, 1947, 1946, 1945, 1944, 1943, 1942, 1941, 1940, 1939, 1938, 1937, 1936, 1935, 1934, 1933, 1932, 1931, 1930, 1929, 1928, 1927, 1926, 1925, 1924, 1923, 1922, 1921, 1920, 1919, 1918, 1917, 1916, 1915, 1914, 1913, 1912, 1911, 1910, 1909, 1908, 1907, 1906, 1905, 1904, 1903, 1902, 1901, 1900, 1899, 1898, 1897, 1896, 1895, 1894, 1893, 1892, 1891, 1890, 1889, 1888, 1887, 1886, 1885, 1884, 1883, 1882, 1881, 1880, 1879, 1878, 1877, 1876, 1875, 1874, 1873, 1872, 1871, 1870, 1869, 1868, 1867, 1866, 1865, 1864, 1863, 1862, 1861, 1860, 1859, 1858, 1857, 1856, 1855, 1854, 1853, 1852, 1851, 1850, 1849, 1848, 1847, 1846, 1845, 1844, 1843, 1842, 1841, 1840, 1839, 1838, 1837, 1836, 1835, 1834, 1833, 1832, 1831, 1830, 1829, 1828, 1827, 1826, 1825, 1824, 1823, 1822, 1821, 1820, 1819, 1818, 1817, 1816, 1815, 1814, 1813, 1812, 1811, 1810, 1809, 1808, 1807, 1806, 1805, 1804, 1803, 1802, 1801, 1800, 1799, 1798, 1797, 1796, 1795, 1794, 1793, 1792, 1791, 1790, 1789, 1788, 1787, 1786, 1785, 1784, 1783, 1782, 1781, 1780, 1779, 1778, 1777, 1776, 1775, 1774, 1773, 1772, 1771, 1770, 1769, 1768, 1767, 1766, 1765, 1764, 1763, 1762, 1761, 1760, 1759, 1758, 1757, 1756, 1755, 1754, 1753, 1752, 1751, 1750, 1749, 1748, 1747, 1746, 1745, 1744, 1743, 1742, 1741, 1740, 1739, 1738, 1737, 1736, 1735, 1734, 1733, 1732, 1731, 1730, 1729, 1728, 1727, 1726, 1725, 1724, 1723, 1722, 1721, 1720, 1719, 1718, 1717, 1716, 1715, 1714, 1713, 1712, 1711, 1710, 1709, 1708, 1707, 1706, 1705, 1704, 1703, 1702, 1701, 1700, 1699, 1698, 1697, 1696, 1695, 1694, 1693, 1692, 1691, 1690, 1689, 1688, 1687, 1686, 1685, 1684, 1683, 1682, 1681, 1680, 1679, 1678, 1677, 1676, 1675, 1674, 1673, 1672, 1671, 1670, 1669, 1668, 1667, 1666, 1665, 1664, 1663, 1662, 1661, 1660, 1659, 1658, 1657, 1656, 1655, 1654, 1653, 1652, 1651, 1650, 1649, 1648, 1647, 1646, 1645, 1644, 1643, 1642, 1641, 1640, 1639, 1638, 1637, 1636, 1635, 1634, 1633, 1632, 1631, 1630, 1629, 1628, 1627, 1626, 1625, 1624, 1623, 1622, 1621, 1620, 1619, 1618, 1617, 1616, 1615, 1614, 1613, 1612, 1611, 1610, 1609, 1608, 1607, 1606, 1605, 1604, 1603, 1602, 1601, 1600, 1599, 1598, 1597, 1596, 1595, 1594, 1593, 1592, 1591, 1590, 1589, 1588, 1587, 1586, 1585, 1584, 1583, 1582, 1581, 1580, 1579, 1578, 1577, 1576, 1575, 1574, 1573, 1572, 1571, 1570, 1569, 1568, 1567, 1566, 1565, 1564, 1563, 1562, 1561, 1560, 1559, 1558, 1557, 1556, 1555, 1554, 1553, 1552, 1551, 1550, 1549, 1548, 1547, 1546, 1545, 1544, 1543, 1542, 1541, 1540, 1539, 1538, 1537, 1536, 1535, 1534, 1533, 1532, 1531, 1530, 1529, 1528, 1527, 1526, 1525, 1524, 1523, 1522, 1521, 1520, 1519, 1518, 1517, 1516, 1515, 1514, 1513, 1512, 1511, 1510, 1509, 1508, 1507, 1506, 1505, 1504, 1503, 1502, 1501, 1500, 1499, 1498, 1497, 1496, 1495, 1494, 1493, 1492, 1491, 1490, 1489, 1488, 1487, 1486, 1485, 1484, 1483, 1482, 1481, 1480, 1479, 1478, 1477, 1476, 1475, 1474, 1473, 1472, 1471, 1470, 1469, 1468, 1467, 1466, 1465, 1464, 1463, 1462, 1461, 1460, 1459, 1458, 1457, 1456, 1455, 1454, 1453, 1452, 1451, 1450, 1449, 1448, 1447, 1446, 1445, 1444, 1443, 1442, 1441, 1440, 1439, 1438, 1437, 1436, 1435, 1434, 1433, 1432, 1431, 1430, 1429, 1428, 1427, 1426, 1425, 1424, 1423, 1422, 1421, 1420, 1419, 1418, 1417, 1416, 1415, 1414, 1413, 1412, 1411, 1410, 1409, 1408, 1407, 1406, 1405, 1404, 1403, 1402, 1401, 1400, 1399, 1398, 1397, 1396, 1395, 1394, 1393, 1392, 1391, 1390, 1389, 1388, 1387, 1386, 1385, 1384, 1383, 1382, 1381, 1380, 1379, 1378, 1377, 1376, 1375, 1374, 1373, 1372, 1371, 1370, 1369, 1368, 1367, 1366, 1365, 1364, 1363, 1362, 1361, 1360, 1359, 1358, 1357, 1356, 1355, 1354, 1353, 1352, 1351, 1350, 1349, 1348, 1347, 1346, 1345, 1344, 1343, 1342, 1341, 1340, 1339, 1338, 1337, 1336, 1335, 1334, 1333, 1332, 1331, 1330, 1329, 1328, 1327, 1326, 1325, 1324, 1323, 1322, 1321, 1320, 1319, 1318, 1317, 1316, 1315, 1314, 1313, 1312, 1311, 1310, 1309, 1308, 1307, 1306, 1305, 1304, 1303, 1302, 1301, 1300, 1299, 1298, 1297, 1296, 1295, 1294, 1293, 1292, 1291, 1290, 1289, 1288, 1287, 1286, 1285, 1284, 1283, 1282, 1281, 1280, 1279, 1278, 1277, 1276, 1275, 1274, 1273, 1272, 1271, 1270, 1269, 1268, 1267, 1266, 1265, 1264, 1263, 1262, 1261, 1260, 1259, 1258, 1257, 1256, 1255, 1254, 1253, 1252, 1251, 1250, 1249, 1248, 1247, 1246, 1245, 1244, 1243, 1242, 1241, 1240, 1239, 1238, 1237, 1236, 1235, 1234, 1233, 1232, 1231, 1230, 1229, 1228, 1227, 1226, 1225, 1224, 1223, 1222, 1221, 1220, 1219, 1218, 1217, 1216, 1215, 1214, 1213, 1212, 1211, 1210, 1209, 1208, 1207, 1206, 1205, 1204, 1203, 1202, 1201, 1200, 1199, 1198, 1197, 1196, 1195, 1194, 1193, 1192, 1191, 1190, 1189, 1188, 1187, 1186, 1185, 1184, 1183, 1182, 1181, 1180, 1179, 1178, 1177, 1176, 1175, 1174, 1173, 1172, 1171, 1170, 1169, 1168, 1167, 1166, 1165, 1164, 1163, 1162, 1161, 1160, 1159, 1158, 1157, 1156, 1155, 1154, 1153, 1152, 1151, 1150, 1149, 1148, 1147, 1146, 1145, 1144, 1143, 1142, 1141, 1140, 1139, 1138, 1137, 1136, 1135, 1134, 1133, 1132, 1131, 1130, 1129, 1128, 1127, 1126, 1125, 1124, 1123, 1122, 1121, 1120, 1119, 1118, 1117, 1116, 1115, 1114, 1113, 1112, 1111, 1110, 1109, 1108, 1107, 1106, 1105, 1104, 1103, 1102, 1101, 1100, 1099, 1098, 1097, 1096, 1095, 1094, 1093, 1092, 1091, 1090, 1089, 1088, 1087, 1086, 1085, 1084, 1083, 1082, 1081, 1080, 1079, 1078, 1077, 1076, 1075, 1074, 1073, 1072, 1071, 1070, 1069, 1068, 1067, 1066, 1065, 1064, 1063, 1062, 1061, 1060, 1059, 1058, 1057, 1056, 1055, 1054, 1053, 1052, 1051, 1050, 1049, 1048, 1047, 1046, 1045, 1044, 1043, 1042, 1041, 1040, 1039, 1038, 1037, 1036, 1035, 1034, 1033, 1032, 1031, 1030, 1029, 1028, 1027, 1026, 1025, 1024, 1023, 1022, 1021, 1020, 1019, 1018, 1017, 1016, 1015, 1014, 1013, 1012, 1011, 1010, 1009, 1008, 1007, 1006, 1005, 1004, 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重复消费列表：

没有重复的记录！

运行多次，都不会出现重复消费，线程安全。

注意：

redis实现分布式锁不是完美解决方案原因解析：

这种实现分布式锁不完美：

1.锁释放不是原子性操作。A线程在进入判断后，此时A线程的key刚好过期，B线程刚获取到锁，A线程又继续执行会误删B线程的key。（误删锁）

2.过期时间不好控制。A线程还没执行完，key过期。B线程获取锁。此时A线程和B线程同时运行。跟没加锁一样。（key的过期时间不好控制）

3.即使获取锁和释放锁的操作都使用lua脚本保证原子性，但是依然无法解决过期时间的控制问题。（如果A线程获取锁后，代码没有执行完，就一直持有锁（锁续命），那么这样就完美了）

关于这几个问题，其实redisson已经帮我们解决了。

用redisson实现分布式锁是一种完美的解决方案，使用方式参考：https://www.cnblogs.com/super-chao/p/15228397.html

redisson完美解决了死锁，误删锁，锁续命的问题：

1.（获取锁）设置key以及过期时间是原子性的。（避免了设置过期时间的时候中途宕机产生死锁）。（redisson底层实现使用的是lua脚本）

2.（释放锁）判断线程只能删除自己线程设置的key，这两步保证了原子性。（避免了误删锁）（redisson底层实现使用的是lua脚本）

3.（锁续命）不会出现A线程还没执行完，锁就过期的问题。（redisson的watchdog（看门狗）自动实现了锁续命）