Redis随笔JedisjedisCluster的使用

Posted 2020-10-22 C小海

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1、Jedis客户端

https://redis.io/clients

2、Jedis源码包与使用介绍

https://github.com/xetorthio/jedis

3、项目中使用

通过maven引入Jedis的依赖包

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.9.0</version>
    <type>jar</type>
    <scope>compile</scope>
</dependency>

4、Jedis的使用

创建Jedis对象，set方法存储key-value值，get方法获取key对应的值。主要是用于单个redis。

Jedis jedis = new Jedis("192.168.56.180", 6379);
jedis.set("Jedis", "Hello Work!");
System.out.println(jedis.get("Jedis"));
jedis.close();

这里是使用IDEA编辑器对Jedis类结构的一个关系图，从图中看出Jedis继承BinaryJedis，实现多个接口。

每一个接口都代表了一类Redis命令，例如JedisCommands中包含了SET GET等命令，MultiKeyCommands中包含了针对多个Key的MSET MGET等命令。

5、JedisCluster的使用

Jediscluster类图和jedis类图大致一样，不过jedisCluster有一些命令是不可用的。比如BinaryJedisCluster类被作废的命令。主要是用在集群中。

类图：

6、单个reids中API的测试

package com.redis;

import org.junit.Test;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.SortingParams;

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * 单机环境Redis操作：一台Redis服务器
 */
public class Standalone {
    private static Jedis jedis;
    static {
        jedis = new Jedis("192.168.56.180", 6379);
        jedis.auth("123456"); // 之前我在redis配置中配置了权限密码，这里需要设置
    }

    /**
     * 测试key - value 的数据
     * @throws InterruptedException
     */
    @Test
    public void testKey() throws InterruptedException {
        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("判断某个键是否存在："+jedis.exists("username"));
        System.out.println("新增<\'username\',\'wukong\'>的键值对："+jedis.set("username", "wukong"));
        System.out.println("是否存在:"+jedis.exists("name"));
        System.out.println("新增<\'password\',\'password\'>的键值对："+jedis.set("password", "password"));
        Set<String> keys = jedis.keys("*");
        System.out.println("系统中所有的键如下："+keys);
        System.out.println("删除键password:"+jedis.del("password"));
        System.out.println("判断键password是否存在："+jedis.exists("password"));
        System.out.println("设置键username的过期时间为5s:"+jedis.expire("username", 5));
        TimeUnit.SECONDS.sleep(2);
        System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
        System.out.println("移除键username的生存时间："+jedis.persist("username"));
        System.out.println("查看键username的剩余生存时间："+jedis.ttl("username"));
        System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
    }

    /***
     * 字符串操作
     * memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。
     * @throws InterruptedException
     */
    @Test
    public void testString() throws InterruptedException {
        jedis.flushDB();
        System.out.println("===========增加数据===========");
        System.out.println(jedis.set("key1","value1"));
        System.out.println(jedis.set("key2","value2"));
        System.out.println(jedis.set("key3", "value3"));
        System.out.println("删除键key2:"+jedis.del("key2"));
        System.out.println("获取键key2:"+jedis.get("key2"));
        System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
        System.out.println("获取key1的值："+jedis.get("key1"));
        System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
        System.out.println("key3的值："+jedis.get("key3"));
        System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03"));
        System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
        System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
        System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
        System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));

        jedis.flushDB();
        System.out.println("===========新增键值对防止覆盖原先值==============");
        System.out.println(jedis.setnx("key1", "value1"));
        System.out.println(jedis.setnx("key2", "value2"));
        System.out.println(jedis.setnx("key2", "value2-new"));
        System.out.println(jedis.get("key1"));
        System.out.println(jedis.get("key2"));

        System.out.println("===========新增键值对并设置有效时间=============");
        System.out.println(jedis.setex("key3", 2, "value3"));
        System.out.println(jedis.get("key3"));
        TimeUnit.SECONDS.sleep(3);
        System.out.println(jedis.get("key3"));

        System.out.println("===========获取原值，更新为新值==========");//GETSET is an atomic set this value and return the old value command.
        System.out.println(jedis.getSet("key2", "key2GetSet"));
        System.out.println(jedis.get("key2"));

        System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4));
    }

    /***
     * 整数和浮点数
     */
    @Test
    public void testNumber() {
        jedis.flushDB();
        jedis.set("key1", "1");
        jedis.set("key2", "2");
        jedis.set("key3", "2.3");
        System.out.println("key1的值："+jedis.get("key1"));
        System.out.println("key2的值："+jedis.get("key2"));
        System.out.println("key1的值加1："+jedis.incr("key1"));
        System.out.println("获取key1的值："+jedis.get("key1"));
        System.out.println("key2的值减1："+jedis.decr("key2"));
        System.out.println("获取key2的值："+jedis.get("key2"));
        System.out.println("将key1的值加上整数5："+jedis.incrBy("key1", 5));
        System.out.println("获取key1的值："+jedis.get("key1"));
        System.out.println("将key2的值减去整数5："+jedis.decrBy("key2", 5));
        System.out.println("获取key2的值："+jedis.get("key2"));
    }

    /***
     * 列表
     */
    @Test
    public void testList() {
        jedis.flushDB();
        System.out.println("===========添加一个list===========");
        jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
        jedis.lpush("collections", "HashSet");
        jedis.lpush("collections", "TreeSet");
        jedis.lpush("collections", "TreeMap");
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素
        System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3));
        System.out.println("===============================");
        // 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
        System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
        System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
        System.out.println("===============================");
        System.out.println("collections的长度："+jedis.llen("collections"));
        System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
        System.out.println("===============================");
        jedis.lpush("sortedList", "3","6","2","0","7","4");
        System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
        System.out.println(jedis.sort("sortedList"));
        System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
    }

    /***
     * set集合
     */
    @Test
    public void testSet() {
        jedis.flushDB();
        System.out.println("============向集合中添加元素============");
        System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
        System.out.println(jedis.sadd("eleSet", "e6"));
        System.out.println(jedis.sadd("eleSet", "e6"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
        System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
        System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
        System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
        System.out.println("=================================");
        System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
        System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
        System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
        System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
        System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
        System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
        System.out.println("============集合运算=================");
        System.out.println("eleSet1中的元素："+jedis.smembers("Redis内存模型及应用解读 读后随笔
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