一、連通性測試

//獲取一個Redis客戶端
Jedis jedisClient = new Jedis("192.168.109.191", 6379);
//正常連線將返回PONG，若未關閉防火牆則丟擲超時異常
System.out.println(jedisClient.ping());

二、基本操作API參照之前的Shell命令

三、事務提交

1. 一般API

   //1.開啟事務,注意區分Transaction類，不要導錯
   Transaction tx=jedisClient.multi();
   //2.Transaction可呼叫大部分方法
   tx.set("k1","v111");
   tx.set("k2",
    
   "v222");
   //3.提交執行事務
   tx.exec();
   // 放棄本次事務
   tx.discard();
   

2. 併發“鎖機制”—watch與unwatch

   	public static  boolean txMethod(){
   	Jedis jedisClient = new Jedis("192.168.109.191",6379);
   	
   	int balance=0;
   	int debt=0;
   	int amtToSubtract=20;
   	
   	//1. 為balance加鎖監視
   	jedisClient.watch("balance");
   	
   	balance=Integer.parseInt(jedisClient.
    
   get("balance"));
   	
   	
   	if(balance<amtToSubtract){
   		//2. 先行判斷，若不滿足直接解鎖，返回失敗
   		jedisClient.unwatch();
   		return false;
   	}else{
   		System.out.println("=====Transaction start=====");
   		//3. 滿足後，開啟事務修改，提交後解鎖，返回成功
   		Transaction tx = jedisClient.multi();
   		tx.decrBy("balance", amtToSubtract);
   		tx.incrBy("debt"
    
   , amtToSubtract);
   		tx.exec();
   		System.out.println("=====Transaction commit=====");
   		
   		balance=Integer.parseInt(jedisClient.get("balance"));
   		debt=Integer.parseInt(jedisClient.get("debt"));
   		System.out.println("=====balance====="+balance);
   		System.out.println("=====debt====="+debt);
   		
   		return true;
   	}
   }
   

四、主從複製

Jedis master = new Jedis("192.168.109.191",6379);
Jedis slave1 = new Jedis("192.168.109.191",6380);
Jedis slave2 = new Jedis("192.168.109.191",6381);
		 
slave1.slaveof("192.168.109.191", 6379);
slave2.slaveof("192.168.109.191", 6380);
		 
master.set("class", "1");
		 
System.out.println("slave1 get===>"+slave1.get("class"));