redis锁机制介绍与实例

package com.fly.lock;import redis.clients.jedis.Jedis;import redis.clients.jedis.JedisPool;import redis.clients.jedis.JedisPoolConfig;public class RedisLock {  //初始化redis池  private static JedisPoolConfig config;  private static JedisPool pool;  static {    config = new JedisPoolConfig();    config.setMaxTotal(30);    config.setMaxIdle(10);    pool = new JedisPool(config, "192.168.233.200", 6379);  }  /**   * 给target上锁   * @param target   **/  public static void lock(Object target) {    //获取jedis    Jedis jedis = pool.getResource();    //result接收setnx的返回值，初始值为0    Long result= 0L;    while (result < 1) {      //如果target在redis中已经存在，则返回0；否则，在redis中设置target键值对，并返回1      result = jedis.setnx(target.getClass().getName() + target.hashCode(), Thread.currentThread().getName());    }    jedis.close();  }  /**   * 给target解锁   * @param target   **/  public static void unLock(Object target) {    Jedis jedis = pool.getResource();    //删除redis中target对象的键值对    Long del = jedis.del(target.getClass().getName() + target.hashCode());    jedis.close();  }  /**   * 尝试给target上锁，如果锁成功返回true，如果锁失败返回false   * @param target   * @return   **/  public static boolean tryLock(Object target) {    Jedis jedis = pool.getResource();    Long row = jedis.setnx(target.getClass().getName() + target.hashCode(), "true");    jedis.close();    if (row > 0) {      return true;    }    return false;  }}

package com.fly.test;import com.fly.lock.RedisLock;class Task {  public void doTask() {    //上锁    RedisLock.lock(this);    System.out.println("当前线程: " + Thread.currentThread().getName());    System.out.println("开始执行: " + this.hashCode());    try {      System.out.println("doing...");      Thread.sleep(2000);    } catch (InterruptedException e) {      e.printStackTrace();    }    System.out.println("完成: " + this.hashCode());    //解锁    RedisLock.unLock(this);  }}public class Demo {  public static void main(String[] args) {    Task task = new Task();    Thread[] threads = new Thread[5];    for (Thread thread : threads) {      thread = new Thread(()->{        task.doTask();      });      thread.start();    }  }}