除了上一篇寫的基於Jedis利用redis的setnx函式實現分散式鎖之外。redis官方推薦使用Redisson作為分散式鎖的首選。使用Redisson，不需要自己去封裝lock和unlock方法。只需引入pom檔案，加入相關呼叫方法即可。

1.pom檔案

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.3.2</version>
</dependency
 
>

2.java程式碼呼叫

import org.redisson.Redisson;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;

import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public
 
 class RedissonTest {
    public static void main(String[] args) {
        //Redisson連線配置檔案
        Config config = new Config();
        config. useSingleServer().setAddress("127.0.0.1:6379");
        RedissonClient redisson = Redisson.create(config);
        RLock yuxinLock = redisson.getLock("yuxinLock"
 
); // 1.獲得鎖物件例項

        new RedissonTest().testM(yuxinLock);
    }

    public void testM(RLock yuxinLock){
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(5);
        for(int i = 0; i < 5; i++){
            fixedThreadPool.execute(new Task("woker_" + i,yuxinLock));
        }
    }


   class Task implements Runnable{

        private String name;
        private RLock yuxinLock;

        public Task(String name,RLock yuxinLock){
            this.name = name;
            this.yuxinLock=yuxinLock;
            System.out.println(name);
        }
        public void run() {
            boolean res=false;
            try{
                System.out.println(name+"開始奪鎖大戰");
                //1.不支援過期自動解鎖，不會超時
                //yuxinLock.lock();

                // 2. 支援過期解鎖功能,10秒鐘以後自動解鎖, 無需呼叫unlock方法手動解鎖
                //lock.lock(10, TimeUnit.SECONDS);

                // 3. 嘗試加鎖，最多等待20秒，上鎖以後10秒自動解鎖（實際專案中推薦這種，以防出現死鎖）
                res = yuxinLock.tryLock(20, 10, TimeUnit.SECONDS);
                if(res){
                    System.out.println(this.name + "開始工作了"+new Date());
                    int time = 5000;
                    if(time > 0){
                        Thread.sleep(time);
                    }
                    System.out.println(this.name + "結束工作了;" + new Date());
                }else{
                    System.out.println(name+"等待超時");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            finally{
                if(res){
                    yuxinLock.unlock();
                }
            }
        }

    }
}