没有考虑进程被杀，没有考虑无线自旋的效率，没有考虑redis断掉连接等等的各种情况，只是淡村的写个代码而已：

package com.suibibk.redis;
import java.util.Arrays;
import java.util.List;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.Pipeline;
public class Test {
    static int j = 0;
    static JedisPool jedisPool;
    private static void init() {
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        jedisPoolConfig.setMaxTotal(20);
        jedisPoolConfig.setMaxIdle(10);
        jedisPoolConfig.setMinIdle(5);
        // timeout，这里既是连接超时又是读写超时，从Jedis 2.8开始有区分connectionTimeout和soTimeout的构造函数
        jedisPool = new JedisPool(jedisPoolConfig, "192.168.157.6", 6379, 3000, null);
    }
    private static void lock() {
        Jedis jedis = jedisPool.getResource();
        long lock = jedis.setnx("LOCK", "0");
        System.out.println(lock);
        if(lock==0) {
            //自旋
            while(true) {
                //System.out.println("自旋获取");
                lock = jedis.setnx("LOCK", "0");
                if(lock==1) {
                    System.out.println("获取了1");
                    break;
                }
            }
        }
        //设置过期时间
        jedis.expire("LOCK", 10*60);
        jedis.close();
    }
    private static void unlock() {
        Jedis jedis = jedisPool.getResource();
        jedis.del("LOCK");
        jedis.close();
    }
    public static void main(String[] args) {
        init();
        for(int i=0;i<20;i++) {
            new Thread(new Runnable() {
                public void run() {
                    lock();
                    try {
                            Thread.currentThread().sleep(2000);
                    } catch (InterruptedException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                    }
                    j++;
                    System.out.println("当前的j="+j);
                    unlock();    
                    }
                }).start();
            }
    }
}