Jedis

Jedis

使用Java操作redis

Jedis是redis官方推荐的Java连接开发工具! 使用Java操作redis的中间件

测试

  1. 导入对应的依赖

        
        <dependency>
            <groupId>redis.clientsgroupId>
            <artifactId>jedisartifactId>
            <version>4.4.3version>
        dependency>
    
        
        <dependency>
            <groupId>com.alibaba.fastjson2groupId>
            <artifactId>fastjson2artifactId>
            <version>2.0.39version>
        dependency>
    
  2. 编码测试

    • 连接数据库
    • 操作命令
    • 断开连接

public class TestPing {
    public static void main(String[] args) {
        // 1. new Jedis 对象
        Jedis jedis = new Jedis("8.130.104.8",6379);
        System.out.println(jedis.ping());
    }
}

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-4EBsSGGG-1693069547398)(D:\Typora\NoteFile\Redis\images\image-20230825234003770.png)]

常用API

对key的操作

public class TestKey {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("8.130.104.8", 6379);

        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','kuangshen'>的键值对:"+jedis.set("username", "kuangshen"));
        System.out.println("新增<'password','password'>的键值对:"+jedis.set("password", "password"));
        System.out.print("系统中所有的键如下:");
        Set<String> keys = jedis.keys("*");
        System.out.println(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("查看键username所存储的值的类型:"+jedis.type("username"));
        System.out.println("随机返回key空间的一个:"+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("按索引查询:"+jedis.select(0));
        System.out.println("删除当前选择数据库中的所有key:"+jedis.flushDB());
        System.out.println("返回当前数据库中key的数目:"+jedis.dbSize());
        System.out.println("删除所有数据库中的所有key:"+jedis.flushAll());
    }
}

String

public class TestString {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("8.130.104.8", 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

public class TestList {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("8.130.104.8", 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

public class TestSet {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("8.130.104.8", 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

public class TestHash {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("8.130.104.8", 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
        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"));
    }
}

Zset


事务操作

public class TestMulti {
    public static void main(String[] args) {
        //创建客户端连接服务端,redis服务端需要被开启
        Jedis jedis = new Jedis("8.130.104.8", 6379);
        jedis.flushDB();

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","zs");

        // 开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();
        try {
            multi.set("user1",result);
            multi.set("user2",result);
            int i = 1/0; // 代码抛出异常,事务执行失败
            multi.exec(); // 执行事务
        } catch (Exception e) {
            //如果出现异常,回滚
            multi.discard(); // 放弃事务
            throw new RuntimeException(e);
        } finally {
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));
            //最终关闭客户端
            jedis.close();
        }
    }
}

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