1、使用watch，采用乐观锁

2、不使用悲观锁，因为等待时间非常长，响应慢

3、不使用队列，因为并发量会让队列内存瞬间升高

测试代码：

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import redis.clients.jedis.Jedis;/** * redis测试抢购 *  * @author 10255_000 *  */public class RedisTest {    public static void main(String[] args) {        final String watchkeys = "watchkeys";        ExecutorService executor = Executors.newFixedThreadPool(20);        final Jedis jedis = new Jedis("192.168.3.202", 6379);        jedis.set(watchkeys, "0");// 重置watchkeys为0        jedis.del("setsucc", "setfail");// 清空抢成功的，与没有成功的        jedis.close();        for (int i = 0; i < 10000; i++) {
   // 测试一万人同时访问            executor.execute(new MyRunnable());        }        executor.shutdown();    }}

import java.util.List;import java.util.UUID;import redis.clients.jedis.Jedis;import redis.clients.jedis.Transaction;public class MyRunnable implements Runnable {    String watchkeys = "watchkeys";// 监视keys    Jedis jedis = new Jedis("192.168.3.202", 6379);    public MyRunnable() {    }    @Override    public void run() {        try {            jedis.watch(watchkeys);// watchkeys            String val = jedis.get(watchkeys);            int valint = Integer.valueOf(val);            String userifo = UUID.randomUUID().toString();            if (valint < 10) {                Transaction tx = jedis.multi();// 开启事务                tx.incr("watchkeys");                List