redis-Jedis

前言

Jedis 是 Redis 官方首选的 Java 客户端开发包。

Jedis只是消息的传递，他只是把数据传递给redis。方法不做赘述，以下记录Jedis的导入和实例化操作。

使用Jedis

使用maven添加依赖

<dependency>
  <groupId>redis.clients</groupId>
  <artifactId>jedis</artifactId>
  <version>3.3.0</version>
</dependency>

Jedis源码下载

https://github.com/xetorthio/jedis/releases

Jedis实例

1. Jedis

import redis.clients.jedis.Jedis;
public class JedisClient {
    public static final String _HOST = "*.*.*.*";
    public static final Integer _PORT = 6379;

    public static void main(String[] args) {
        Jedis jedis = new Jedis(_HOST, _PORT);

        jedis.set("name", "zs");
        String name = jedis.get("name");
        System.out.println(name);
    }
}

2. JedisPool

import redis.clients.jedis.Jedis;
public class JedisPoolClient {
    public static final String _HOST = "*.*.*.*";
    public static final Integer _PORT = 6379;

    public static void main(String[] args) {
        // 连接池配置
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        jedisPoolConfig.setMaxTotal(10);

        // 连接池初始化
        JedisPool jedisPool = new JedisPool(jedisPoolConfig, _HOST, _PORT);
        // 获取jedis实例
        Jedis resource = jedisPool.getResource();
        // 使用redis连接
        resource.set("name", "RzZ");
        String name = resource.get("name");
        System.out.println(name);
        // 释放redis连接
        resource.close();
        
        // 不释放redis连接
        for (int i = 0; i < 20; i++) {
            System.out.println(i + ":" +jedisPool.getResource());
        }
    }
}

输出

RzZ
0:redis.clients.jedis.Jedis@4f2410ac
1:redis.clients.jedis.Jedis@73c6c3b2
2:redis.clients.jedis.Jedis@48533e64
3:redis.clients.jedis.Jedis@64a294a6
4:redis.clients.jedis.Jedis@7e0b37bc
5:redis.clients.jedis.Jedis@3b95a09c
6:redis.clients.jedis.Jedis@6ae40994
7:redis.clients.jedis.Jedis@1a93a7ca
8:redis.clients.jedis.Jedis@3d82c5f3
9:redis.clients.jedis.Jedis@2b05039f     <==== 连接耗尽，等待释放连接,使用完一定要释放连接

3. Sharde

public class ShardedJedisClient {
    public static final String _HOST = "122.51.243.39";
    public static final Integer _PORT = 6379;

    public static void main(String[] args) {
        List<JedisShardInfo> shardInfos = Arrays.asList(new JedisShardInfo(_HOST, 7001)
                , new JedisShardInfo(_HOST,7002)
                , new JedisShardInfo(_HOST,7003));
        ShardedJedis shardedJedis = new ShardedJedis(shardInfos);
        shardedJedis.set("name", "zs");
        System.out.println(shardedJedis.get("name"));

        // 连接池配置
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        jedisPoolConfig.setMaxTotal(10);
        // 分片连接池
        ShardedJedisPool shardedJedisPool = new ShardedJedisPool(jedisPoolConfig,shardInfos);
        try(ShardedJedis resource = shardedJedisPool.getResource()){
            System.out.println(resource.get("name"));
        }

        // java1.7以上使用try-with-source，会总动释放连接
        for (int i = 0; i < 20; i++) {
            try(ShardedJedis resource = shardedJedisPool.getResource()){
                System.out.println(i + ":" + resource);
            }
        }
    }
}

输出

zs
zs
0:redis.clients.jedis.ShardedJedis@4f2410ac
1:redis.clients.jedis.ShardedJedis@4f2410ac
2:redis.clients.jedis.ShardedJedis@4f2410ac
3:redis.clients.jedis.ShardedJedis@4f2410ac
4:redis.clients.jedis.ShardedJedis@4f2410ac
5:redis.clients.jedis.ShardedJedis@4f2410ac
6:redis.clients.jedis.ShardedJedis@4f2410ac
7:redis.clients.jedis.ShardedJedis@4f2410ac
8:redis.clients.jedis.ShardedJedis@4f2410ac
9:redis.clients.jedis.ShardedJedis@4f2410ac
10:redis.clients.jedis.ShardedJedis@4f2410ac
11:redis.clients.jedis.ShardedJedis@4f2410ac
12:redis.clients.jedis.ShardedJedis@4f2410ac
13:redis.clients.jedis.ShardedJedis@4f2410ac
14:redis.clients.jedis.ShardedJedis@4f2410ac
15:redis.clients.jedis.ShardedJedis@4f2410ac
16:redis.clients.jedis.ShardedJedis@4f2410ac
17:redis.clients.jedis.ShardedJedis@4f2410ac
18:redis.clients.jedis.ShardedJedis@4f2410ac
19:redis.clients.jedis.ShardedJedis@4f2410ac

Process finished with exit code 0

Jedis使用

Jedis只是消息的传递，他只是把数据传递给redis。

Jedis使用与redis-cli使用相似，只需使用Jedis实例调用redis方法即可。

前文有redis环境搭建及相关操作的指令笔记，Jedis只是一个工具，了解redis的原理即可快速上手Jedis的基本使用。有关redis的工具类封装下文列出的参考资料中有引用，站在前人的肩膀上封装更适合自己的工具类即可。

参考

• Jedis API
• Jedis工具类使用
• Java使用Redis