java操作redis

jedis操作

顾名思义就是通过java来操作redis

测试能否连接redis

1.创建一个普通的maven工程命名为jedis_redisdemo

导入jar包

    <dependencies>
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>3.2.0version>
        dependency>
    dependencies>
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2.在src/main/java下创建对应的包和类，类名JedisDemo1

书写类中代码，目的是测试能否连通我们服务器上的redis

package com.qcby.jedis;

import redis.clients.jedis.Jedis;

public class JedisDemo1 {
    public static void main(String[] args) {
        //创建Jedis对象，注意修改成自己的服务器ip
        Jedis jedis = new Jedis("127.0.0.1",6379);
        //配置redis的密码
        jedis.auth("cjj");
        //测试
        String value = jedis.ping();
        System.out.println(value);
    }
}
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在测试之前首先要注释掉服务器的bind，否则只能本机访问

关闭保护模式，将protected-mode修改为no

修改完成后将旧的redis线程杀死然后重新启动修改后的配置文件

3.暂时关闭防火墙

firewall指令

#查看状态
systemctl status firewalld
# 开启
service firewalld start
# 重启
service firewalld restart
# 关闭
service firewalld stop
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4.出现pong证明连通成功

测试key

添加一个demo1方法

    public static void demo1(Jedis jedis){
        jedis.set("k1", "v1");
        jedis.set("k2", "v2");
        jedis.set("k3", "v3");

        Set<String> keys = jedis.keys("*");
        System.out.println("key键值个数：");
        System.out.println(keys.size());
        System.out.println("key键值有哪些：");
        for (String key : keys) {
            System.out.println(key);
        }
        System.out.println("是否存在k1");
        System.out.println(jedis.exists("k1"));
        System.out.println("k1过期时间");
        System.out.println(jedis.ttl("k1"));
        System.out.println("k1的值");
        System.out.println(jedis.get("k1"));

    }
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执行结果

测试String

代码：

public static void demo2(Jedis jedis){
        jedis.mset("str1","v1","str2","v2","str3","v3");
        System.out.println(jedis.mget("str1","str2","str3"));
    }
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结果

测试List

代码

    public static void demo3(Jedis jedis){
        jedis.lpush("mylist","a","b","c");
        List<String> list = jedis.lrange("mylist",0,-1);
        for (String element : list) {
            System.out.println(element);
        }

    }
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结果

测试hash

代码：

    public static void demo4(Jedis jedis){
        jedis.sadd("orders", "order01");
        jedis.sadd("orders", "order02");
        jedis.sadd("orders", "order03");
        jedis.sadd("orders", "order04");
        Set<String> smembers = jedis.smembers("orders");
        for (String order : smembers) {
            System.out.println(order);
        }
        jedis.srem("orders", "order02");

    }
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结果：

测试set

代码：

    public static void demo5(Jedis jedis){
        jedis.hset("hash1","userName","lisi");
        System.out.println(jedis.hget("hash1","userName"));
        Map<String,String> map = new HashMap<String,String>();
        map.put("telphone","13810169999");
        map.put("address","atguigu");
        map.put("email","abc@163.com");
        jedis.hmset("hash2",map);
        List<String> result = jedis.hmget("hash2", "telphone","email");
        for (String element : result) {
            System.out.println(element);
        }

    }
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结果：

测试zset

代码

    public static void demo6(Jedis jedis){
        jedis.zadd("zset01", 100d, "z3");
        jedis.zadd("zset01", 90d, "l4");
        jedis.zadd("zset01", 80d, "w5");
        jedis.zadd("zset01", 70d, "z6");

        Set<String> zrange = jedis.zrange("zset01", 0, -1);

        for (String e : zrange) {
            System.out.println(e);
        }

    }
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结果

测试完后要关闭jedis