java连接redis

 

　　　　

1）ip和端口号不正确

2）虚拟机中防火墙的原因（可能性较大）

3）redis.conf 中bind 127.0.0.1 未用#注释掉

对于防火墙可开放对应端口，或者直接关闭防火墙，开放对应端口

 

 

常用API

package test;

import redis.clients.jedis.Jedis;

/*
 * Copyright (C) 2017 Baidu, Inc. All Rights Reserved.
 */

public class Test {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("192.168.101.128", 6379);
        System.out.println(jedis.ping());
        jedis.set("k1", "v1");
        jedis.set("k2", "v2");
        jedis.set("k3", "v3");
        System.out.println(jedis.get("k3"));
    }
}

 

Redis事务

Jedis jedis = new Jedis("192.168.101.128", 6379);
int balance = Integer.parseInt(jedis.get("balance")) ;
int debat = Integer.parseInt(jedis.get("debat")) ;
        
jedis.watch("balance");        
if (balance < 10) {
    jedis.unwatch();
    System.out.println("error");
} else {
    Transaction  transaction = jedis.multi();
    ransaction.decrBy("balance", 10);
    transaction.incrBy("debat", 10);
    transaction.exec();
    System.out.println("执行成功");
}

 主从复制

        Jedis jedis_M = new Jedis("192.168.101.128", 6379);
        Jedis jedis_S = new Jedis("192.168.101.128", 6380);     
        jedis_M.set("k3", "v3");
        jedis_M.set("k4", "v4:我是新添加的");
        String result = jedis_S.get("k4");
        System.out.println(result);