1、介绍

Jedis是java开发的操作redis的工具包。

2、Jedis的用法

2.1、引入maven依赖

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>4.2.1</version>
</dependency>

2.2、使用redis的api操作redis

案例代码如下，重点在于 Jedis 工具类，这个类中包含了操作redis的所有方法。

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPubSub;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * @className JedisDemo
 * @date 2022/6/21
 **/
public class JedisDemo {
    Jedis jedis;

    @Before
    public void before() {
        this.jedis = new Jedis("127.0.0.1", 6379);
    }

    @After
    public void after() {
        //关闭jedis
        this.jedis.close();
    }

    /**
     * 测试redis是否连通
     */
    @Test
    public void test1() {
        String ping = jedis.ping();
        System.out.println(ping);
    }

    /**
     * string类型测试
     */
    @Test
    public void stringTest() {
        jedis.set("site", "http://www.itsoku");
        System.out.println(jedis.get("site"));
        System.out.println(jedis.ttl("site"));
    }

    /**
     * list类型测试
     */
    @Test
    public void listTest() {
        jedis.rpush("courses", "java", "spring", "springmvc", "springboot");
        List<String> courses = jedis.lrange("courses", 0, -1);
        for (String course : courses) {
            System.out.println(course);
        }
    }

    /**
     * set类型测试
     */
    @Test
    public void setTest() {
        jedis.sadd("users", "tom", "jack", "ready");
        Set<String> users = jedis.smembers("users");
        for (String user : users) {
            System.out.println(user);
        }
    }

    /**
     * hash类型测试
     */
    @Test
    public void hashTest() {
        jedis.hset("user:1001", "id", "1001");
        jedis.hset("user:1001", "name", "张三");
        jedis.hset("user:1001", "age", "30");
        Map<String, String> userMap = jedis.hgetAll("user:1001");
        System.out.println(userMap);
    }

    /**
     * zset类型测试
     */
    @Test
    public void zsetTest() {
        jedis.zadd("languages", 100d, "java");
        jedis.zadd("languages", 95d, "c");
        jedis.zadd("languages", 70d, "php");
        List<String> languages = jedis.zrange("languages", 0, -1);
        System.out.println(languages);
    }

    /**
     * 订阅消息
     *
     * @throws InterruptedException
     */
    @Test
    public void subscribeTest() throws InterruptedException {
        // subscribe(消息监听器,频道列表)
        jedis.subscribe(new JedisPubSub() {
            @Override
            public void onMessage(String channel, String message) {
                System.out.println(channel + ":" + message);
            }
        }, "sitemsg");
        TimeUnit.HOURS.sleep(1);
    }

    /**
     * 发布消息
     *
     * @throws InterruptedException
     */
    @Test
    public void publishTest() {
        jedis.publish("sitemsg", "hello redis");
    }

}