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()));
 }