redis： Jedis API（十四）

1、Key操作

package com.kuang;

import redis.clients.jedis.Jedis;
import java.util.Set;

public class TestKey {
    public static void main(String[] args) {

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

2、String操作

package com.kuang;

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));
    }
}

3、Set操作

package com.kuang;

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"));
    }
}

4、List操作

package com.kuang;

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));
    }
}

5、Hash操作

package com.kuang;

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<>();
        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"));
    }
}

6、事务操作

package com.kuang;

import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;

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

        jedis.flushDB();

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","kuangshen");
        // 开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();
        // jedis.watch(result)
        try {
            multi.set("user1",result);
            multi.set("user2",result);
            int i = 1/0 ; // 代码抛出异常事务，执行失败！
            multi.exec(); // 执行事务！
        } catch (Exception e) {
            multi.discard(); // 放弃事务
            e.printStackTrace();
        } finally {
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));
            jedis.close(); // 关闭连接
        }

    }
}