java操作Redis之字符串操作

最新推荐文章于 2025-05-16 14:08:39 发布

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最新推荐文章于 2025-05-16 14:08:39 发布

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分类专栏： Redis

本文链接：https://blog.youkuaiyun.com/lyzx_in_csdn/article/details/79393217

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本文通过Java代码示例展示了如何使用Jedis客户端库与Redis进行交互，包括设置和获取键值、批量设置与获取、键值修改等基本操作。

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package com.lyh.redis.test;

import java.util.List;
import org.junit.Test;
import redis.clients.jedis.Jedis;

public class SingleRedisTest1 {
    public Jedis init(){
        //一个Jedis对象对应这个一个Redis的实例
        Jedis jedis = new Jedis("192.168.29.160",6379);
        return jedis;
    }

    public void destroy(Jedis j){
        //在关闭时断开连接，测试发现在操作之前调用这个方法后Jedis实例依然可以使用
        j.disconnect();
    }

    @Test
    public void testString1(){
        Jedis jedis = init();

        //成功返回字符串 "OK"
        String setReturn = jedis.set("k1","lyzx");
        System.out.println("setReturn:"+setReturn);

        System.out.println(jedis.get("k1"));

        //成功返回1  失败返回0
        Long v1 = jedis.setnx("k2","newValue");
        System.out.println("setnx="+v1);

        jedis.append("k1"," very NB");
        System.out.println(jedis.get("k1"));

        String oldValue = jedis.getSet("k1","lyzx getSet's new value");
        System.out.println("k1对应的旧值:"+oldValue);
        System.out.println("k1设置后的新值:"+jedis.get("k1"));
        destroy(jedis);
    }

    @Test
    public void testString2(){
        Jedis jedis = init();

        //SET key value [EX seconds]  设置一个有生命周期的值
        jedis.setex("10s",10,"10");

        String msetReturn = jedis.mset("k9","v9","k8","v8","k7","123456789","k6","100");
        System.out.println("msetReturn:"+msetReturn);

        //mget 获取多个值
        List<String> values = jedis.mget("k9","k8");
        for(String v : values){
            System.out.print(v+"-");
        }
        System.out.println();

        //重命名和删除
        jedis.rename("k8","k8_renamed");
        System.out.println("k8->k8_renamed");
        System.out.println("strlen(k8_renamed):"+jedis.strlen("k8_renamed")+" k8_renamed's new Value="+jedis.get("k8_renamed"));
        Long delState = jedis.del("k8_renamed");
        System.out.println("after del["+delState+"] k8_renamed:"+jedis.get("k8_renamed"));

        //获取k7对应的值的0到4位置的字节组成的字符串
        String subRange = jedis.getrange("k7",0,4);
        System.out.println("subRange:"+subRange);

        //增加 -100
        Long incrByState = jedis.incrBy("k6",-100);
        System.out.println("incrByState:"+incrByState+" reValue:"+jedis.get("k6"));

        destroy(jedis);
    }
}