Jedis对Redis的常用命令操作

本篇主要总结一些Jedis对Redis的常用命令操作：

1.对key操作命令 

2.对String操作命令 

3.对List操作命令 

4.对Set操作命令 

5.对Hash操作命令 

6.排序操作指令

一、项目中添加redis和junit的依赖。

<dependency>
   <groupId>redis.clients</groupId>
   <artifactId>jedis</artifactId>
   <version>2.9.0</version>
</dependency>
<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
</dependency>

 二、创建JedisUtil工具类。

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

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

/**
 * @Author guoyuanhao
 * @Date 2018/4/8 18:41
 */
public class JedisUtil {

    private static JedisUtil jedisUtil;

    private JedisUtil(){};

    public static JedisUtil getInstance(){
        if (jedisUtil == null){
            synchronized(JedisUtil.class){
                if (jedisUtil == null){
                    jedisUtil = new JedisUtil();
                }
            }
        }
        return jedisUtil;
    }

    //Jedis的连接池
    private static Map<String,JedisPool> maps = new HashMap<String,JedisPool>();

    private static JedisPool getPool(String ip, int port){
        String key = ip+":"+port;
        JedisPool pool = null;
        if(!maps.containsKey(key)){
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxIdle(RedisConfig.MAX_IDLE);
            config.setMinIdle(RedisConfig.MIN_IDLE);
            config.setMaxTotal(RedisConfig.MAX_TOTAL);
            config.setMaxWaitMillis(RedisConfig.MAX_WAIT);
            config.setTestOnBorrow(true);
            config.setTestOnReturn(true);

            pool = new JedisPool(config,ip,port,RedisConfig.TIMEOUT);
            maps.put(key, pool);
        }else{
            pool = maps.get(key);
        }
        return pool;
    }

    public Jedis getJedis(String ip, int port){
        Jedis jedis = null;
        int count = 0;
        do{
            try{
                jedis = getPool(ip,port).getResource();
            }catch (Exception e){
                getPool(ip,port).returnBrokenResource(jedis);
            }
        }while(jedis == null && count<RedisConfig.RETRY_NUM);
        return jedis;
    }

    public void closeJedis(Jedis jedis, String ip, int port){
        if(jedis != null){
            getPool(ip,port).returnResource(jedis);
        }
    }

    public static class RedisConfig {
        //最大实例总数
        public static int MAX_TOTAL = 150;

        //最大空闲连接数, 默认8个
        public static int MAX_IDLE = 100;

        //最小空闲连接数, 默认8个
        public static int MIN_IDLE = 10;

        //等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
        public static int MAX_WAIT = 10000;

        public static int TIMEOUT = 10000;

        public static int RETRY_NUM = 5;

        public RedisConfig(){};
    }
}

三、用Juint单元测试命令操作
1.静态变量，ip,端口号。

private static final String ipAddr = "192.168.16.142";
private static final int port = 6379;
private static Jedis jedis = null;

2.测试类方法执行之前从连接池中获取jedis对象，执行之后关闭jedis对象。

@Before
public void init() { jedis = JedisUtil.getInstance().getJedis(ipAddr, port); }
@After
public void close() { JedisUtil.getInstance().closeJedis(jedis,ipAddr, port); }

3.单元测试
　　3.1.对key操作的命令

@Test
public void testKey(){
    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','zzh'>的键值对："+jedis.set("username", "zzh"));
    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());
}

　　3.2.对String操作的命令

@Test
public void testString(){
    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"));
    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));
}

　　3.3.对List操作命令

@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,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));
}

　　3.4.对Set的操作命令

@Test
public void testSet(){
    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"));
}

　　3.5.对Hash的操作命令

@Test
public void testHash(){
    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"));
}

　　3.6.排序操作指令

@Test
public void testSort(){
    jedis.flushDB();
    //jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
    jedis.lpush("collections","ArrayList");
    jedis.lpush("collections","Vector");
    jedis.lpush("collections","Stack");
    jedis.lpush("collections","HashMap");
    jedis.lpush("collections","WeakHashMap");
    jedis.lpush("collections","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");
    jedis.lpush("sortedList","3");
    jedis.lpush("sortedList","6");
    jedis.lpush("sortedList","2");
    jedis.lpush("sortedList","0");
    jedis.lpush("sortedList","7");
    jedis.lpush("sortedList","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("降序："+jedis.sort("sortedList", sortingParameters.desc()));
}