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Redis五大数据类型与使用场景汇总！！（含完整实战案例，建议收藏）_redis5种数据类型应用场景

作者：码创造者 | 2024-07-08 12:20:05

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redis5种数据类型应用场景

在这里插入图片描述

String（字符串）

string类型是二进制安全的。意思是redis的string可以包含任何数据。比如jpg图片或者序列化的对象 。

string类型是Redis最基本的数据类型，一个redis中字符串value最多可以是512M。

Hash（哈希）

Redis hash 是一个键值对集合。

Redis hash是一个string类型的field和value的映射表，hash特别适合用于存储对象。

类似Java里面的Map<String,Object>

List（列表）

Redis 列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素导列表的头部（左边）或者尾部（右边）。底层实际是个链表。

Set（集合）

Redis的Set是string类型的无序集合。它是通过HashTable实现的。

Zset(sorted set：有序集合)

Redis zset 和 set 一样也是string类型元素的集合,且不允许重复的成员。不同的是每个元素都会关联一个double类型的分数。Redis正是通过分数来为集合中的成员进行从小到大的排序。zset的成员是唯一的,但分数(score)却可以重复。

使用案例

这里，为了让小伙伴们更加清晰的理解如何使用Java客户端来操作Redis数据，我们会分别使用Jedis和JedisCluster来演示如何操作Redis中的数据。

准备工作

通过maven引入Jedis的依赖包。

redis.clients

jedis

2.9.0

jar

compile

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(“192.168.175.100”, 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。

接下来，我们给出Jedis测试Redis五大数据类型的完整测试代码。

分类代码：

  • 获取Jedis句柄

private static Jedis jedis;

static {

jedis = new Jedis(“192.168.175.100”, 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

}

  • key-value数据

/**

  • 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 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

/***

  • 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

/***

  • 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

/***

  • 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

/***

  • 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(“eleSet1”));

System.out.println(“eleSet2中的元素：”+jedis.smembers(“eleSet2”));

System.out.println(“eleSet1和eleSet2的交集:”+jedis.sinter(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的并集:”+jedis.sunion(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的差集:”+jedis.sdiff(“eleSet1”,“eleSet2”));//eleSet1中有，eleSet2中没有

}

  • Hash散列

/***

  • 散列

*/

@Test

public void testHash() {

jedis.flushDB();

Map<String,String> map = new HashMap<String,String>();

map.put(“key1”,“value1”);

map.put(“key2”,“value2”);

map.put(“key3”,“value3”);

map.put(“key4”,“value4”);

jedis.hmset(“hash”,map);

jedis.hset(“hash”, “key5”, “value5”);

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));//return Map<String,String>

System.out.println(“散列hash的所有键为：”+jedis.hkeys(“hash”));//return Set

System.out.println(“散列hash的所有值为：”+jedis.hvals(“hash”));//return List

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 6));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 3));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“删除一个或者多个键值对：”+jedis.hdel(“hash”, “key2”));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“散列hash中键值对的个数：”+jedis.hlen(“hash”));

System.out.println(“判断hash中是否存在key2：”+jedis.hexists(“hash”,“key2”));

System.out.println(“判断hash中是否存在key3：”+jedis.hexists(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”,“key4”));

}

  • 有序集合

/**

  • 有序集合

*/

@Test

public void testSortedSet() {

jedis.flushDB();

Map<String,Double> map = new HashMap<String,Double>();

map.put(“key2”,1.2);

map.put(“key3”,4.0);

map.put(“key4”,5.0);

map.put(“key5”,0.2);

System.out.println(jedis.zadd(“zset”, 3,“key1”));

System.out.println(jedis.zadd(“zset”,map));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeWithScores(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScore(“zset”, 0,100));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScoreWithScores(“zset”, 0,100));

System.out.println(“zset中key2的分值：”+jedis.zscore(“zset”, “key2”));

System.out.println(“zset中key2的排名：”+jedis.zrank(“zset”, “key2”));

System.out.println(“删除zset中的元素key3：”+jedis.zrem(“zset”, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中元素的个数：”+jedis.zcard(“zset”));

System.out.println(“zset中分值在1-4之间的元素的个数：”+jedis.zcount(“zset”, 1, 4));

System.out.println(“key2的分值加上5：”+jedis.zincrby(“zset”, 5, “key2”));

System.out.println(“key3的分值加上4：”+jedis.zincrby(“zset”, 4, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

}

  • 排序

/**

  • 排序

*/

@Test

public void testSort()

{

jedis.flushDB();

jedis.lpush(“collections”, “ArrayList”, “Vector”, “Stack”, “HashMap”, “WeakHashMap”, “LinkedHashMap”);

System.out.println(“collections的内容：”+jedis.lrange(“collections”, 0, -1));

SortingParams sortingParameters = new SortingParams();

System.out.println(jedis.sort(“collections”,sortingParameters.alpha()));

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(“升序：”+jedis.sort(“sortedList”, sortingParameters.asc()));

System.out.println(“升序：”+jedis.sort(“sortedList”, sortingParameters.desc()));

System.out.println(“===============================”);

jedis.lpush(“userlist”, “33”);

jedis.lpush(“userlist”, “22”);

jedis.lpush(“userlist”, “55”);

jedis.lpush(“userlist”, “11”);

jedis.hset(“user:66”, “name”, “66”);

jedis.hset(“user:55”, “name”, “55”);

jedis.hset(“user:33”, “name”, “33”);

jedis.hset(“user:22”, “name”, “79”);

jedis.hset(“user:11”, “name”, “24”);

jedis.hset(“user:11”, “add”, “beijing”);

jedis.hset(“user:22”, “add”, “shanghai”);

jedis.hset(“user:33”, “add”, “guangzhou”);

jedis.hset(“user:55”, “add”, “chongqing”);

jedis.hset(“user:66”, “add”, “xi’an”);

sortingParameters = new SortingParams();

sortingParameters.get(“user:*->name”);

sortingParameters.get(“user:*->add”);

System.out.println(jedis.sort(“userlist”,sortingParameters));

}

完整代码：

package com.binghe.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(“192.168.175.100”, 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 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(“eleSet1”));

System.out.println(“eleSet2中的元素：”+jedis.smembers(“eleSet2”));

System.out.println(“eleSet1和eleSet2的交集:”+jedis.sinter(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的并集:”+jedis.sunion(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的差集:”+jedis.sdiff(“eleSet1”,“eleSet2”));//eleSet1中有，eleSet2中没有

}

/***

  • 散列

*/

@Test

public void testHash() {

jedis.flushDB();

Map<String,String> map = new HashMap<String,String>();

map.put(“key1”,“value1”);

map.put(“key2”,“value2”);

map.put(“key3”,“value3”);

map.put(“key4”,“value4”);

jedis.hmset(“hash”,map);

jedis.hset(“hash”, “key5”, “value5”);

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));//return Map<String,String>

System.out.println(“散列hash的所有键为：”+jedis.hkeys(“hash”));//return Set

System.out.println(“散列hash的所有值为：”+jedis.hvals(“hash”));//return List

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 6));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 3));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“删除一个或者多个键值对：”+jedis.hdel(“hash”, “key2”));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“散列hash中键值对的个数：”+jedis.hlen(“hash”));

System.out.println(“判断hash中是否存在key2：”+jedis.hexists(“hash”,“key2”));

System.out.println(“判断hash中是否存在key3：”+jedis.hexists(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”,“key4”));

}

/**

  • 有序集合

*/

@Test

public void testSortedSet() {

jedis.flushDB();

Map<String,Double> map = new HashMap<String,Double>();

map.put(“key2”,1.2);

map.put(“key3”,4.0);

map.put(“key4”,5.0);

map.put(“key5”,0.2);

System.out.println(jedis.zadd(“zset”, 3,“key1”));

System.out.println(jedis.zadd(“zset”,map));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeWithScores(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScore(“zset”, 0,100));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScoreWithScores(“zset”, 0,100));

System.out.println(“zset中key2的分值：”+jedis.zscore(“zset”, “key2”));

System.out.println(“zset中key2的排名：”+jedis.zrank(“zset”, “key2”));

System.out.println(“删除zset中的元素key3：”+jedis.zrem(“zset”, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中元素的个数：”+jedis.zcard(“zset”));

System.out.println(“zset中分值在1-4之间的元素的个数：”+jedis.zcount(“zset”, 1, 4));

System.out.println(“key2的分值加上5：”+jedis.zincrby(“zset”, 5, “key2”));

System.out.println(“key3的分值加上4：”+jedis.zincrby(“zset”, 4, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

}

/**

  • 排序

*/

@Test

public void testSort()

{

jedis.flushDB();

jedis.lpush(“collections”, “ArrayList”, “Vector”, “Stack”, “HashMap”, “WeakHashMap”, “LinkedHashMap”);

System.out.println(“collections的内容：”+jedis.lrange(“collections”, 0, -1));

SortingParams sortingParameters = new SortingParams();

System.out.println(jedis.sort(“collections”,sortingParameters.alpha()));

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(“升序：”+jedis.sort(“sortedList”, sortingParameters.asc()));

System.out.println(“升序：”+jedis.sort(“sortedList”, sortingParameters.desc()));

System.out.println(“===============================”);

jedis.lpush(“userlist”, “33”);

jedis.lpush(“userlist”, “22”);

jedis.lpush(“userlist”, “55”);

jedis.lpush(“userlist”, “11”);

jedis.hset(“user:66”, “name”, “66”);

jedis.hset(“user:55”, “name”, “55”);

jedis.hset(“user:33”, “name”, “33”);

jedis.hset(“user:22”, “name”, “79”);

jedis.hset(“user:11”, “name”, “24”);

jedis.hset(“user:11”, “add”, “beijing”);

jedis.hset(“user:22”, “add”, “shanghai”);

jedis.hset(“user:33”, “add”, “guangzhou”);

jedis.hset(“user:55”, “add”, “chongqing”);

jedis.hset(“user:66”, “add”, “xi’an”);

sortingParameters = new SortingParams();

sortingParameters.get(“user:*->name”);

sortingParameters.get(“user:*->add”);

System.out.println(jedis.sort(“userlist”,sortingParameters));

}

}

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。

接下来，我们给出使用JedisCluster测试Redis五大数据类型的完整源码。

分类代码

  • 获取JedisCluster句柄

private static JedisCluster jedis;

static {

// 添加集群的服务节点Set集合

Set hostAndPortsSet = new HashSet();

// 添加节点

hostAndPortsSet.add(new HostAndPort(“192.168.175.100”, 7777));

hostAndPortsSet.add(new HostAndPort(“192.168.175.100”, 8888));

hostAndPortsSet.add(new HostAndPort(“192.168.175.101”, 7777));

hostAndPortsSet.add(new HostAndPort(“192.168.175.101”, 8888));

hostAndPortsSet.add(new HostAndPort(“192.168.175.102”, 7777));

hostAndPortsSet.add(new HostAndPort(“192.168.175.102”, 8888));

// Jedis连接池配置

JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();

// 最大空闲连接数, 默认8个

jedisPoolConfig.setMaxIdle(100);

// 最大连接数, 默认8个

jedisPoolConfig.setMaxTotal(500);

//最小空闲连接数, 默认0

jedisPoolConfig.setMinIdle(0);

// 获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间, 默认-1

jedisPoolConfig.setMaxWaitMillis(2000); // 设置2秒

//对拿到的connection进行validateObject校验

jedisPoolConfig.setTestOnBorrow(true);

jedis = new JedisCluster(hostAndPortsSet, jedisPoolConfig);

}

  • key-value数据

/**

  • 测试key:value数据

  • 集群中flushDB、keys废弃

*/

@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”, “xiaohai”));

System.out.println(“是否存在:”+jedis.exists(“username”));

System.out.println(“新增<‘password’,‘password’>的键值对：”+jedis.set(“password”, “123456”));

//Set 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10s:”+jedis.expire(“username”, 10));

TimeUnit.SECONDS.sleep(2); // 线程睡眠2秒System.out.println(“查看键username的剩余生存时间：”+jedis.ttl(“username”));

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

/***

  • 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。

  • 集群中flushDB、keys、del(多个值)、mset(多个值)废弃

  • @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”));

//命令的时候才会去连接连接，集群中连接是对一个节点连接，不能判断多个key经过crc16算法所对应的槽在一个节点上，不支持多key获取、删除

//System.out.println(“增加多个键值对：”+jedis.mset(“key01”,“value01”,“key02”,“value02”));

//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)); // 相当截取字符串的第二个位置-第四个位置的字符串

}

  • 整数和浮点数

/***

  • 整数和浮点数

*/

@Test

public void testNumber() {

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”));

System.out.println(“key3的值：”+jedis.get(“key3”));

// 这里会报错，因为key3不是整数不能做计算:redis.clients.jedis.exceptions.JedisDataException: ERR value is not an integer or out of range

// System.out.println(“key2的值减1：”+jedis.decr(“key3”));

}

  • 列表

/***

  • 列表

*/

@Test

public void testList() {

System.out.println(“=添加一个list=”);

jedis.lpush(“collections”, “ArrayList”, “Vector”, “Stack”, “HashMap”, “WeakHashMap”, “LinkedHashMap”);

jedis.lpush(“collections”, “HashSet”); // 叠加

jedis.lpush(“collections”, “TreeSet”); // 叠加

jedis.lpush(“collections”, “TreeMap”); // 叠加

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)); // 前面4个值

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

/***

  • set集合

*/

@Test

public void testSet() {

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”)); // 返回0，集合中已经存在

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(“e5是否在eleSet中：”+jedis.sismember(“eleSet”, “e5”));

// 集群下并存会报错：redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch this command to Redis Cluster because keys have different slots.

// Redis集群，从key1集合与key2集合并存、交集、差集，两个键经过crc16算法可能有不同的槽。

/*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(“eleSet1”));

System.out.println(“eleSet2中的元素：”+jedis.smembers(“eleSet2”));

System.out.println(“eleSet1和eleSet2的交集:”+jedis.sinter(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的并集:”+jedis.sunion(“eleSet1”,“eleSet2”));

System.out.println(“eleSet1和eleSet2的差集:”+jedis.sdiff(“eleSet1”,“eleSet2”));*/

jedis.del(“eleSet”);

jedis.del(“eleSet1”);

jedis.del(“eleSet2”);

jedis.del(“eleSet3”);

}

  • Hash散列

/***

  • 散列

*/

@Test

public void testHash() {

Map<String,String> map = new HashMap<String,String>();

map.put(“key1”,“value1”);

map.put(“key2”,“value2”);

map.put(“key3”,“value3”);

map.put(“key4”,“value4”);

jedis.hmset(“hash”,map);

jedis.hset(“hash”, “key5”, “value5”);

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));//return Map<String,String>

System.out.println(“散列hash的所有键为：”+jedis.hkeys(“hash”));//return Set

System.out.println(“散列hash的所有值为：”+jedis.hvals(“hash”));//return List

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 6));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“将key6保存的值加上一个整数，如果key6不存在则添加key6：”+jedis.hincrBy(“hash”, “key6”, 3));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“删除一个或者多个键值对：”+jedis.hdel(“hash”, “key2”));

System.out.println(“散列hash的所有键值对为：”+jedis.hgetAll(“hash”));

System.out.println(“散列hash中键值对的个数：”+jedis.hlen(“hash”));

System.out.println(“判断hash中是否存在key2：”+jedis.hexists(“hash”,“key2”));

System.out.println(“判断hash中是否存在key3：”+jedis.hexists(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”));

System.out.println(“获取hash中的值：”+jedis.hmget(“hash”,“key3”,“key4”));

}

  • 有序集合

/**

  • 有序集合

*/

@Test

public void testSortedSet() {

Map<String,Double> map = new HashMap<String,Double>();

map.put(“key2”,1.2);

map.put(“key3”,4.0);

map.put(“key4”,5.0);

map.put(“key5”,0.2);

// 将一个或多个 member 元素及其 score 值加入到有序集 key 当中，如果某个 member 已经是有序集的成员，那么更新这个 member 的 score 值

// score 值可以是整数值或双精度浮点数

System.out.println(jedis.zadd(“zset”, 3,“key1”));

System.out.println(jedis.zadd(“zset”,map));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeWithScores(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScore(“zset”, 0,100));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScoreWithScores(“zset”, 0,100));

System.out.println(“zset中key2的分值：”+jedis.zscore(“zset”, “key2”));

System.out.println(“zset中key2的排名：”+jedis.zrank(“zset”, “key2”));

System.out.println(“删除zset中的元素key3：”+jedis.zrem(“zset”, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中元素的个数：”+jedis.zcard(“zset”));

System.out.println(“zset中分值在1-4之间的元素的个数：”+jedis.zcount(“zset”, 1, 4));

System.out.println(“key2的分值加上5：”+jedis.zincrby(“zset”, 5, “key2”));

System.out.println(“key3的分值加上4：”+jedis.zincrby(“zset”, 4, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));
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深知大多数Java工程师，想要提升技能，往往是自己摸索成长或者是报班学习，但对于培训机构动则几千的学费，着实压力不小。自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！

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最后

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zrange(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeWithScores(“zset”, 0, -1));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScore(“zset”, 0,100));

System.out.println(“zset中的所有元素：”+jedis.zrangeByScoreWithScores(“zset”, 0,100));

System.out.println(“zset中key2的分值：”+jedis.zscore(“zset”, “key2”));

System.out.println(“zset中key2的排名：”+jedis.zrank(“zset”, “key2”));

System.out.println(“删除zset中的元素key3：”+jedis.zrem(“zset”, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));

System.out.println(“zset中元素的个数：”+jedis.zcard(“zset”));

System.out.println(“zset中分值在1-4之间的元素的个数：”+jedis.zcount(“zset”, 1, 4));

System.out.println(“key2的分值加上5：”+jedis.zincrby(“zset”, 5, “key2”));

System.out.println(“key3的分值加上4：”+jedis.zincrby(“zset”, 4, “key3”));

System.out.println(“zset中的所有元素：”+jedis.zrange(“zset”, 0, -1));
自我介绍一下，小编13年上海交大毕业，曾经在小公司待过，也去过华为、OPPO等大厂，18年进入阿里一直到现在。

深知大多数Java工程师，想要提升技能，往往是自己摸索成长或者是报班学习，但对于培训机构动则几千的学费，着实压力不小。自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！

因此收集整理了一份《2024年Java开发全套学习资料》，初衷也很简单，就是希望能够帮助到想自学提升又不知道该从何学起的朋友，同时减轻大家的负担。[外链图片转存中…(img-C9hjQLvL-1713376793152)]

[外链图片转存中…(img-I0ozifpo-1713376793152)]

[外链图片转存中…(img-TXpIRQV7-1713376793153)]

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由于文件比较大，这里只是将部分目录截图出来，每个节点里面都包含大厂面经、学习笔记、源码讲义、实战项目、讲解视频，并且会持续更新！

如果你觉得这些内容对你有帮助，可以扫码获取！！（备注Java获取）

img

最后

无论是哪家公司，都很重视基础，大厂更加重视技术的深度和广度，面试是一个双向选择的过程，不要抱着畏惧的心态去面试，不利于自己的发挥。同时看中的应该不止薪资，还要看你是不是真的喜欢这家公司，是不是能真的得到锻炼。

针对以上面试技术点，我在这里也做一些分享，希望能更好的帮助到大家。

[外链图片转存中…(img-zpZRvLuJ-1713376793153)]

[外链图片转存中…(img-G2sjBv1p-1713376793153)]

[外链图片转存中…(img-46jvge3o-1713376793153)]

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