Java通過jedis連接redis的幾種常用方法

更新時間：2024年03月06日 11:26:52 作者：師小師

jedis封裝了redis原有的操作命令,使用起來很簡單,本文主要介紹了Java通過jedis連接redis的幾種常用方法,具有一定的參考價值,感興趣的可以了解一下

Jedis

使用 Java 來操作 Redis，知其然并知其所以然

什么是Jedis 是 Redis 官方推薦的 java連接開發(fā)工具！使用Java 操作Redis 中間件！如果你要使用java操作redis，那么一定要對Jedis 十分的熟悉

測試：

1、導(dǎo)入對應(yīng)的依賴

<!-- 導(dǎo)入jedis包 -->
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.5.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.75</version>
</dependency>

2、編碼測試

連接數(shù)據(jù)庫
操作命令
斷開連接

package com.ss;

import redis.clients.jedis.Jedis;

public class PingTest {
    public static void main(String[] args) {
        //1、new Jedis 對象即可
        Jedis jedis = new Jedis("127.0.0.1",6379);

        System.out.println(jedis.ping());
    }
}

輸出結(jié)果：

在這里插入圖片描述

常用API

判斷key

		Jedis jedis = new Jedis("127.0.0.1", 6379);

        System.out.println("清空數(shù)據(jù)："+jedis.flushDB());
        System.out.println("判斷某個鍵是否存在："+jedis.exists("username"));
        System.out.println("新增<'username','kuangshen'>的鍵值對："+jedis.set("username", "kuangshen"));
        System.out.println("新增<'password','password'>的鍵值對："+jedis.set("password", "password"));
        System.out.print("系統(tǒng)中所有的鍵如下：");
        Set<String> keys = jedis.keys("*");
        System.out.println(keys);

        System.out.println("刪除鍵password:"+jedis.del("password"));
        System.out.println("判斷鍵password是否存在："+jedis.exists("password"));
        System.out.println("查看鍵username所存儲的值的類型："+jedis.type("username"));
        System.out.println("隨機(jī)返回key空間的一個："+jedis.randomKey());
        System.out.println("重命名key："+jedis.rename("username","name"));
        System.out.println("取出改后的name："+jedis.get("name"));
        System.out.println("按索引查詢："+jedis.select(0));
                System.out.println("刪除當(dāng)前選擇數(shù)據(jù)庫中的所有key："+jedis.flushDB());
        System.out.println("返回當(dāng)前數(shù)據(jù)庫中key的數(shù)目："+jedis.dbSize());
        System.out.println("刪除所有數(shù)據(jù)庫中的所有key："+jedis.flushAll());

String

Jedis jedis = new Jedis("127.0.0.1", 6379);

        jedis.flushDB();
        System.out.println("===========增加數(shù)據(jù)===========");
        System.out.println(jedis.set("key1","value1"));
        System.out.println(jedis.set("key2","value2"));
        System.out.println(jedis.set("key3", "value3"));
        System.out.println("刪除鍵key2:"+jedis.del("key2"));
        System.out.println("獲取鍵key2:"+jedis.get("key2"));
        System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
        System.out.println("獲取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("增加多個鍵值對："+jedis.mset("key01","value01","key02","value02","key03","value03"));
        System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03"));
        System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03","key04"));
        System.out.println("刪除多個鍵值對："+jedis.del("key01","key02"));
        System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03"));

        jedis.flushDB();
        System.out.println("===========新增鍵值對防止覆蓋原先值==============");
        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("===========新增鍵值對并設(shè)置有效時間=============");
        System.out.println(jedis.setex("key3", 2, "value3"));
        System.out.println(jedis.get("key3"));
        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(jedis.get("key3"));

        System.out.println("===========獲取原值，更新為新值==========");
        System.out.println(jedis.getSet("key2", "key2GetSet"));
        System.out.println(jedis.get("key2"));

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

List

Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("===========添加一個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的內(nèi)容："+jedis.lrange("collections", 0, -1));//-1代表倒數(shù)第一個元素，-2代表倒數(shù)第二個元素,end為-1表示查詢?nèi)?
        System.out.println("collections區(qū)間0-3的元素："+jedis.lrange("collections",0,3));
        System.out.println("===============================");
        // 刪除列表指定的值 ，第二個參數(shù)為刪除的個數(shù)（有重復(fù)時），后add進(jìn)去的值先被刪，類似于出棧
        System.out.println("刪除指定元素個數(shù)："+jedis.lrem("collections", 2, "HashMap"));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("刪除下表0-3區(qū)間之外的元素："+jedis.ltrim("collections", 0, 3));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections列表出棧（左端）："+jedis.lpop("collections"));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections添加元素，從列表右端，與lpush相對應(yīng)："+jedis.rpush("collections", "EnumMap"));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("collections列表出棧（右端）："+jedis.rpop("collections"));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("修改collections指定下標(biāo)1的內(nèi)容："+jedis.lset("collections", 1, "LinkedArrayList"));
        System.out.println("collections的內(nèi)容："+jedis.lrange("collections", 0, -1));
        System.out.println("===============================");
        System.out.println("collections的長度："+jedis.llen("collections"));
        System.out.println("獲取collections下標(biāo)為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

Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("============向集合中添加元素（不重復(fù)）============");
        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的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("刪除一個元素e0："+jedis.srem("eleSet", "e0"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("刪除兩個元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("隨機(jī)的移除集合中的一個元素："+jedis.spop("eleSet"));
        System.out.println("隨機(jī)的移除集合中的一個元素："+jedis.spop("eleSet"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("eleSet中包含元素的個數(shù)："+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("將eleSet1中刪除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));//移到集合元素
        System.out.println("將eleSet1中刪除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("============集合運算=================");
        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中沒有
        jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并將交集保存到dstkey的集合
        System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4"));

Hash

Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        Map<String,String> map = new HashMap<>();
        map.put("key1","value1");
        map.put("key2","value2");
        map.put("key3","value3");
        map.put("key4","value4");
        //添加名稱為hash（key）的hash元素
        jedis.hmset("hash",map);
        //向名稱為hash的hash中添加key為key5，value為value5元素
        jedis.hset("hash", "key5", "value5");
        System.out.println("散列hash的所有鍵值對為："+jedis.hgetAll("hash"));//return Map<String,String>
        System.out.println("散列hash的所有鍵為："+jedis.hkeys("hash"));//return Set<String>
        System.out.println("散列hash的所有值為："+jedis.hvals("hash"));//return List<String>
        System.out.println("將key6保存的值加上一個整數(shù)，如果key6不存在則添加key6："+jedis.hincrBy("hash", "key6", 6));
        System.out.println("散列hash的所有鍵值對為："+jedis.hgetAll("hash"));
        System.out.println("將key6保存的值加上一個整數(shù)，如果key6不存在則添加key6："+jedis.hincrBy("hash", "key6", 3));
        System.out.println("散列hash的所有鍵值對為："+jedis.hgetAll("hash"));
        System.out.println("刪除一個或者多個鍵值對："+jedis.hdel("hash", "key2"));
        System.out.println("散列hash的所有鍵值對為："+jedis.hgetAll("hash"));
        System.out.println("散列hash中鍵值對的個數(shù)："+jedis.hlen("hash"));
        System.out.println("判斷hash中是否存在key2："+jedis.hexists("hash","key2"));
        System.out.println("判斷hash中是否存在key3："+jedis.hexists("hash","key3"));
        System.out.println("獲取hash中的值："+jedis.hmget("hash","key3"));
        System.out.println("獲取hash中的值："+jedis.hmget("hash","key3","key4"));

Zset

Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("============向集合中添加元素（不重復(fù)）============");
        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的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("刪除一個元素e0："+jedis.srem("eleSet", "e0"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("刪除兩個元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("隨機(jī)的移除集合中的一個元素："+jedis.spop("eleSet"));
        System.out.println("隨機(jī)的移除集合中的一個元素："+jedis.spop("eleSet"));
        System.out.println("eleSet的所有元素為："+jedis.smembers("eleSet"));
        System.out.println("eleSet中包含元素的個數(shù)："+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("將eleSet1中刪除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));//移到集合元素
        System.out.println("將eleSet1中刪除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("============集合運算=================");
        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中沒有
        jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并將交集保存到dstkey的集合
        System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4"));

所有的api命令，就是對應(yīng)的redis的命令！

事務(wù)

//代碼
Jedis jedis = new Jedis("127.0.0.1", 6379);

        jedis.flushDB();

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","kuangshen");
        // 開啟事務(wù)
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();
        // jedis.watch(result)
        try {
            multi.set("user1",result);
            multi.set("user2",result);
            int i = 1/0 ; // 代碼拋出異常事務(wù)，執(zhí)行失??！
            multi.exec(); // 執(zhí)行事務(wù)！
        } catch (Exception e) {
            multi.discard(); // 放棄事務(wù)
            e.printStackTrace();
        } finally {
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));
            jedis.close(); // 關(guān)閉連接
        }

到此這篇關(guān)于Java通過jedis連接redis的幾種常用方法的文章就介紹到這了,更多相關(guān)Java jedis連接redis內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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