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目录
Jedis
/  

Jedis

我们要使用java操作Redis

什么是jedis,是Redis官方推荐的java链接开发工具!使用java操作Redis中间件!如果要使用java操作redis,那么一定要对jedis十分的熟悉。所以我们所以要知其所以然。

测试

导入对应的依赖

 <!--导入jedis包-->
        <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>3.3.0</version>
        </dependency>
        <!--fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.74</version>
        </dependency>

编码测试

package yscxy;

import redis.clients.jedis.Jedis;

/**
 * @Author WangFuKun
 * @create 2020/10/19 16:50
 */
public class TestPing {
    public static void main(String[] args) {
        //1. new Jedis对象即可
        Jedis jedis = new Jedis("127.0.0.1",6379);
        //jedis所有的命令就是我们之前学习的所有的指令!
        System.out.println( jedis.ping());
  
    }

}

输出:

image.png

常用API

String

package yscxy;

import redis.clients.jedis.Jedis;

import java.util.concurrent.TimeUnit;

public class TestString {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);

        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("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"));
        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(jedis.get("key3"));

        System.out.println("===========获取原值,更新为新值==========");
        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));
    }
}

List

package yscxy;

import redis.clients.jedis.Jedis;

public class TestList {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        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,end为-1表示查询全部
        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

package yscxy;

import redis.clients.jedis.Jedis;

public class TestSet {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        jedis.flushDB();
        System.out.println("============向集合中添加元素(不重复)============");
        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"));//移到集合元素
        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
        jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并将交集保存到dstkey的集合
        System.out.println("eleSet4中的元素:"+jedis.smembers("eleSet4"));
    }
}

Hash

package yscxy;

import redis.clients.jedis.Jedis;

import java.util.HashMap;
import java.util.Map;

public class TestHash {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1", 6379);
        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");
        //添加名称为hash(key)的hash元素
        jedis.hmset("hash",map);
        //向名称为hash的hash中添加key为key5,value为value5元素
        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<String>
        System.out.println("散列hash的所有值为:"+jedis.hvals("hash"));//return List<String>
        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"));
    }
}

Zset

所有的api命令,就是我们对象上面学习的指令,一个都没有变


标题:Jedis
作者:野生程序员
地址:http://www.yscxy.net/articles/2020/10/19/1603100548303.html