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這篇文章給大家分享的是有關Jedis對redis五大類型的操作示例的內容。小編覺得挺實用的,因此分享給大家做個參考,一起跟隨小編過來看看吧。
Jedis對redis的五大類型的操作:字符串、列表、散列、集合、有序集合。
##JedisUtil
這里的測試用例采用junit4進行運行,準備代碼如下:
private static final String ipAddr = "10.10.195.112"; private static final int port = 6379; private static Jedis jedis= null; @BeforeClass public static void init() { jedis = JedisUtil.getInstance().getJedis(ipAddr, port); } @AfterClass public static void close() { JedisUtil.getInstance().closeJedis(jedis,ipAddr, port); }
其中JedisUtil是對jedis做的簡單封裝,代碼如下:
import org.apache.log4j.Logger; import java.util.HashMap; import java.util.Map; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class JedisUtil { private Logger logger = Logger.getLogger(this.getClass().getName()); private JedisUtil(){} private static class RedisUtilHolder{ private static final JedisUtil instance = new JedisUtil(); } public static JedisUtil getInstance(){ return RedisUtilHolder.instance; } 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.setMaxActive(RedisConfig.MAX_ACTIVE); config.setMaxIdle(RedisConfig.MAX_IDLE); config.setMaxWait(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) { logger.error("get redis master1 failed!",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 class RedisConfig { //可用連接實例的最大數目,默認值為8; //如果賦值為-1,則表示不限制;如果pool已經分配了maxActive個jedis實例,則此時pool的狀態為exhausted(耗盡)。 public static int MAX_ACTIVE = 1024; //控制一個pool最多有多少個狀態為idle(空閑的)的jedis實例,默認值也是8。 public static int MAX_IDLE = 200; //等待可用連接的最大時間,單位毫秒,默認值為-1,表示永不超時。如果超過等待時間,則直接拋出JedisConnectionException; public static int MAX_WAIT = 10000; public static int TIMEOUT = 10000; public static int RETRY_NUM = 5; }
##鍵操作
@Test public void testKey() throws InterruptedException { System.out.println("清空數據:"+jedis.flushDB()); System.out.println("判斷某個鍵是否存在:"+jedis.exists("username")); System.out.println("新增<'username','zzh'>的鍵值對:"+jedis.set("username", "zzh")); System.out.println(jedis.exists("name")); System.out.println("新增<'password','password'>的鍵值對:"+jedis.set("password", "password")); System.out.print("系統中所有的鍵如下:"); Set<String> keys = jedis.keys("*"); System.out.println(keys); System.out.println("刪除鍵password:"+jedis.del("password")); System.out.println("判斷鍵password是否存在:"+jedis.exists("password")); System.out.println("設置鍵username的過期時間為5s:"+jedis.expire("username", 5)); TimeUnit.SECONDS.sleep(2); System.out.println("查看鍵username的剩余生存時間:"+jedis.ttl("username")); System.out.println("移除鍵username的生存時間:"+jedis.persist("username")); System.out.println("查看鍵username的剩余生存時間:"+jedis.ttl("username")); System.out.println("查看鍵username所存儲的值的類型:"+jedis.type("username")); }
輸出結果:
清空數據:OK 判斷某個鍵是否存在:false 新增<'username','zzh'>的鍵值對:OK false 新增<'password','password'>的鍵值對:OK 系統中所有的鍵如下:[username, password] 刪除鍵password:1 判斷鍵password是否存在:false 設置鍵username的過期時間為5s:1 查看鍵username的剩余生存時間:3 移除鍵username的生存時間:1 查看鍵username的剩余生存時間:-1 查看鍵username所存儲的值的類型:string
##字符串操作
在Redis里面,字符串可以存儲三種類型的值:
字節串(byte string)
整數
浮點數
###字節串
@Test public void testString() throws InterruptedException { jedis.flushDB(); System.out.println("===========增加數據==========="); System.out.println(jedis.set("key1","value1")); System.out.println(jedis.set("key2","value2")); System.out.println(jedis.set("key3", "value3")); System.out.println("刪除鍵key2:"+jedis.del("key2")); System.out.println("獲取鍵key2:"+jedis.get("key2")); System.out.println("修改key1:"+jedis.set("key1", "value1Changed")); System.out.println("獲取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("增加多個鍵值對:"+jedis.mset("key01","value01","key02","value02","key03","value03")); System.out.println("獲取多個鍵值對:"+jedis.mget("key01","key02","key03")); System.out.println("獲取多個鍵值對:"+jedis.mget("key01","key02","key03","key04")); System.out.println("刪除多個鍵值對:"+jedis.del(new String[]{"key01","key02"})); System.out.println("獲取多個鍵值對:"+jedis.mget("key01","key02","key03")); jedis.flushDB(); System.out.println("===========新增鍵值對防止覆蓋原先值=============="); 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("===========新增鍵值對并設置有效時間============="); System.out.println(jedis.setex("key3", 2, "value3")); System.out.println(jedis.get("key3")); TimeUnit.SECONDS.sleep(3); System.out.println(jedis.get("key3")); System.out.println("===========獲取原值,更新為新值==========");//GETSET is an atomic set this value and return the old value command. System.out.println(jedis.getSet("key2", "key2GetSet")); System.out.println(jedis.get("key2")); System.out.println("獲得key2的值的字串:"+jedis.getrange("key2", 2, 4)); }
輸出結果:
===========增加數據=========== OK OK OK 刪除鍵key2:1 獲取鍵key2:null 修改key1:OK 獲取key1的值:value1Changed 在key3后面加入值:9 key3的值:value3End 增加多個鍵值對:OK 獲取多個鍵值對:[value01, value02, value03] 獲取多個鍵值對:[value01, value02, value03, null] 刪除多個鍵值對:2 獲取多個鍵值對:[null, null, value03] ===========新增鍵值對防止覆蓋原先值============== 1 1 0 value1 value2 ===========新增鍵值對并設置有效時間============= OK value3 null ===========獲取原值,更新為新值========== value2 key2GetSet 獲得key2的值的字串:y2G
memcached和redis同樣有append的操作,但是memcached有prepend的操作,redis中并沒有。
###整數和浮點數
@Test public void testNumber() { jedis.flushDB(); jedis.set("key1", "1"); jedis.set("key2", "2"); jedis.set("key3", "2.3"); System.out.println("key1的值:"+jedis.get("key1")); System.out.println("key2的值:"+jedis.get("key2")); System.out.println("key1的值加1:"+jedis.incr("key1")); System.out.println("獲取key1的值:"+jedis.get("key1")); System.out.println("key2的值減1:"+jedis.decr("key2")); System.out.println("獲取key2的值:"+jedis.get("key2")); System.out.println("將key1的值加上整數5:"+jedis.incrBy("key1", 5)); System.out.println("獲取key1的值:"+jedis.get("key1")); System.out.println("將key2的值減去整數5:"+jedis.decrBy("key2", 5)); System.out.println("獲取key2的值:"+jedis.get("key2")); }
輸出結果:
key1的值:1 key2的值:2 key1的值加1:2 獲取key1的值:2 key2的值減1:1 獲取key2的值:1 將key1的值加上整數5:7 獲取key1的值:7 將key2的值減去整數5:-4 獲取key2的值:-4
在redis2.6或以上版本中有這個命令:incrbyfloat,即將鍵存儲的值加上浮點數amount,jedis-2.1.0中不支持這一操作。
##列表
@Test public void testList()
{
jedis.flushDB();
System.out.println("=添加一個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的內容:”+jedis.lrange(“collections”, 0, -1));//-1代表倒數第一個元素,-2代表倒數第二個元素
System.out.println(“collections區間0-3的元素:”+jedis.lrange(“collections”,0,3));
System.out.println("=");
// 刪除列表指定的值 ,第二個參數為刪除的個數(有重復時),后add進去的值先被刪,類似于出棧
System.out.println(“刪除指定元素個數:”+jedis.lrem(“collections”, 2, “HashMap”));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println(“刪除下表0-3區間之外的元素:”+jedis.ltrim(“collections”, 0, 3));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println(“collections列表出棧(左端):”+jedis.lpop(“collections”));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println(“collections添加元素,從列表右端,與lpush相對應:”+jedis.rpush(“collections”, “EnumMap”));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println(“collections列表出棧(右端):”+jedis.rpop(“collections”));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println(“修改collections指定下標1的內容:”+jedis.lset(“collections”, 1, “LinkedArrayList”));
System.out.println(“collections的內容:”+jedis.lrange(“collections”, 0, -1));
System.out.println("=");
System.out.println(“collections的長度:”+jedis.llen(“collections”));
System.out.println(“獲取collections下標為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));
}
輸出結果:
===========添加一個list=========== collections的內容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList] collections區間0-3的元素:[TreeMap, TreeSet, HashSet, LinkedHashMap] =============================== 刪除指定元素個數:1 collections的內容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, Stack, Vector, ArrayList] 刪除下表0-3區間之外的元素:OK collections的內容:[TreeMap, TreeSet, HashSet, LinkedHashMap] collections列表出棧(左端):TreeMap collections的內容:[TreeSet, HashSet, LinkedHashMap] collections添加元素,從列表右端,與lpush相對應:4 collections的內容:[TreeSet, HashSet, LinkedHashMap, EnumMap] collections列表出棧(右端):EnumMap collections的內容:[TreeSet, HashSet, LinkedHashMap] 修改collections指定下標1的內容:OK collections的內容:[TreeSet, LinkedArrayList, LinkedHashMap] =============================== collections的長度:3 獲取collections下標為2的元素:LinkedHashMap =============================== sortedList排序前:[4, 7, 0, 2, 6, 3] [0, 2, 3, 4, 6, 7] sortedList排序后:[4, 7, 0, 2, 6, 3]
Redis中還有阻塞式的列表彈出命令以及在列表之間移動元素的命令:blpop, brpop, rpoplpush, brpoplpush等。
##集合(Set)
@Test public void testSet() { jedis.flushDB(); System.out.println("============向集合中添加元素============"); 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的所有元素為:"+jedis.smembers("eleSet")); System.out.println("刪除一個元素e0:"+jedis.srem("eleSet", "e0")); System.out.println("eleSet的所有元素為:"+jedis.smembers("eleSet")); System.out.println("刪除兩個元素e7和e6:"+jedis.srem("eleSet", "e7","e6")); System.out.println("eleSet的所有元素為:"+jedis.smembers("eleSet")); System.out.println("隨機的移除集合中的一個元素:"+jedis.spop("eleSet")); System.out.println("隨機的移除集合中的一個元素:"+jedis.spop("eleSet")); System.out.println("eleSet的所有元素為:"+jedis.smembers("eleSet")); System.out.println("eleSet中包含元素的個數:"+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("將eleSet1中刪除e1并存入eleSet3中:"+jedis.smove("eleSet1", "eleSet3", "e1")); System.out.println("將eleSet1中刪除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("============集合運算================="); 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中沒有 }
輸出結果:
============向集合中添加元素============ 8 1 0 eleSet的所有元素為:[e3, e4, e1, e2, e0, e8, e7, e6, e5] 刪除一個元素e0:1 eleSet的所有元素為:[e3, e4, e1, e2, e8, e7, e6, e5] 刪除兩個元素e7和e6:2 eleSet的所有元素為:[e3, e4, e1, e2, e8, e5] 隨機的移除集合中的一個元素:e5 隨機的移除集合中的一個元素:e2 eleSet的所有元素為:[e3, e4, e1, e8] eleSet中包含元素的個數:4 e3是否在eleSet中:true e1是否在eleSet中:true e1是否在eleSet中:false ================================= 8 6 將eleSet1中刪除e1并存入eleSet3中:1 將eleSet1中刪除e2并存入eleSet3中:1 eleSet1中的元素:[e3, e4, e0, e8, e7, e5] eleSet3中的元素:[e1, e2] ============集合運算================= eleSet1中的元素:[e3, e4, e0, e8, e7, e5] eleSet2中的元素:[e3, e4, e1, e2, e0, e8] eleSet1和eleSet2的交集:[e3, e4, e0, e8] eleSet1和eleSet2的并集:[e3, e4, e1, e2, e0, e8, e7, e5] eleSet1和eleSet2的差集:[e7, e5]
關于Set還有一些其他命令:srandmember, sdiffstore, sinterstore, sunionstore等。
##散列
@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"); jedis.hmset("hash",map); jedis.hset("hash", "key5", "value5"); System.out.println("散列hash的所有鍵值對為:"+jedis.hgetAll("hash"));//return Map<String,String> System.out.println("散列hash的所有鍵為:"+jedis.hkeys("hash"));//return Set<String> System.out.println("散列hash的所有值為:"+jedis.hvals("hash"));//return List<String> System.out.println("將key6保存的值加上一個整數,如果key6不存在則添加key6:"+jedis.hincrBy("hash", "key6", 6)); System.out.println("散列hash的所有鍵值對為:"+jedis.hgetAll("hash")); System.out.println("將key6保存的值加上一個整數,如果key6不存在則添加key6:"+jedis.hincrBy("hash", "key6", 3)); System.out.println("散列hash的所有鍵值對為:"+jedis.hgetAll("hash")); System.out.println("刪除一個或者多個鍵值對:"+jedis.hdel("hash", "key2")); System.out.println("散列hash的所有鍵值對為:"+jedis.hgetAll("hash")); System.out.println("散列hash中鍵值對的個數:"+jedis.hlen("hash")); System.out.println("判斷hash中是否存在key2:"+jedis.hexists("hash","key2")); System.out.println("判斷hash中是否存在key3:"+jedis.hexists("hash","key3")); System.out.println("獲取hash中的值:"+jedis.hmget("hash","key3")); System.out.println("獲取hash中的值:"+jedis.hmget("hash","key3","key4")); }
輸出結果:
散列hash的所有鍵值對為:{key4=value4, key3=value3, key5=value5, key2=value2, key1=value1} 散列hash的所有鍵為:[key4, key3, key5, key2, key1] 散列hash的所有值為:[value4, value3, value1, value2, value5] 將key6保存的值加上一個整數,如果key6不存在則添加key6:6 散列hash的所有鍵值對為:{key4=value4, key3=value3, key6=6, key5=value5, key2=value2, key1=value1} 將key6保存的值加上一個整數,如果key6不存在則添加key6:9 散列hash的所有鍵值對為:{key4=value4, key3=value3, key6=9, key5=value5, key2=value2, key1=value1} 刪除一個或者多個鍵值對:1 散列hash的所有鍵值對為:{key4=value4, key3=value3, key6=9, key5=value5, key1=value1} 散列hash中鍵值對的個數:5 判斷hash中是否存在key2:false 判斷hash中是否存在key3:true 獲取hash中的值:[value3] 獲取hash中的值:[value3, value4]
##有序集合
@Test public void testSortedSet() { jedis.flushDB(); Map<Double,String> map = new HashMap<>(); map.put(1.2,"key2"); map.put(4.0, "key3"); map.put(5.0,"key4"); map.put(0.2,"key5"); System.out.println(jedis.zadd("zset", 3,"key1")); System.out.println(jedis.zadd("zset",map)); System.out.println("zset中的所有元素:"+jedis.zrange("zset", 0, -1)); System.out.println("zset中的所有元素:"+jedis.zrangeWithScores("zset", 0, -1)); System.out.println("zset中的所有元素:"+jedis.zrangeByScore("zset", 0,100)); System.out.println("zset中的所有元素:"+jedis.zrangeByScoreWithScores("zset", 0,100)); System.out.println("zset中key2的分值:"+jedis.zscore("zset", "key2")); System.out.println("zset中key2的排名:"+jedis.zrank("zset", "key2")); System.out.println("刪除zset中的元素key3:"+jedis.zrem("zset", "key3")); System.out.println("zset中的所有元素:"+jedis.zrange("zset", 0, -1)); System.out.println("zset中元素的個數:"+jedis.zcard("zset")); System.out.println("zset中分值在1-4之間的元素的個數:"+jedis.zcount("zset", 1, 4)); System.out.println("key2的分值加上5:"+jedis.zincrby("zset", 5, "key2")); System.out.println("key3的分值加上4:"+jedis.zincrby("zset", 4, "key3")); System.out.println("zset中的所有元素:"+jedis.zrange("zset", 0, -1)); }
輸出結果:
1 4 zset中的所有元素:[key5, key2, key1, key3, key4] zset中的所有元素:[[[107, 101, 121, 53],0.2], [[107, 101, 121, 50],1.2], [[107, 101, 121, 49],3.0], [[107, 101, 121, 51],4.0], [[107, 101, 121, 52],5.0]] zset中的所有元素:[key5, key2, key1, key3, key4] zset中的所有元素:[[[107, 101, 121, 53],0.2], [[107, 101, 121, 50],1.2], [[107, 101, 121, 49],3.0], [[107, 101, 121, 51],4.0], [[107, 101, 121, 52],5.0]] zset中key2的分值:1.2 zset中key2的排名:1 刪除zset中的元素key3:1 zset中的所有元素:[key5, key2, key1, key4] zset中元素的個數:4 zset中分值在1-4之間的元素的個數:2 key2的分值加上5:6.2 key3的分值加上4:4.0 zset中的所有元素:[key5, key1, key3, key4, key2]
有序集合還有諸如zinterstore, zunionstore, zremrangebyscore, zremrangebyrank, zrevrank, zrevrange, zrangebyscore等命令。
##排序sort
@Test public void testSort() { jedis.flushDB(); jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap"); System.out.println("collections的內容:"+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"); 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("升序:"+jedis.sort("sortedList", sortingParameters.desc())); System.out.println("==============================="); jedis.lpush("userlist", "33"); jedis.lpush("userlist", "22"); jedis.lpush("userlist", "55"); jedis.lpush("userlist", "11"); jedis.hset("user:66", "name", "66"); jedis.hset("user:55", "name", "55"); jedis.hset("user:33", "name", "33"); jedis.hset("user:22", "name", "79"); jedis.hset("user:11", "name", "24"); jedis.hset("user:11", "add", "beijing"); jedis.hset("user:22", "add", "shanghai"); jedis.hset("user:33", "add", "guangzhou"); jedis.hset("user:55", "add", "chongqing"); jedis.hset("user:66", "add", "xi'an"); sortingParameters = new SortingParams(); sortingParameters.get("user:*->name"); sortingParameters.get("user:*->add"); System.out.println(jedis.sort("userlist",sortingParameters)); }
輸出結果:
collections的內容:[LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList] [ArrayList, HashMap, LinkedHashMap, Stack, Vector, WeakHashMap] =============================== sortedList排序前:[4, 7, 0, 2, 6, 3] 升序:[0, 2, 3, 4, 6, 7] 升序:[7, 6, 4, 3, 2, 0] =============================== [24, beijing, 79, shanghai, 33, guangzhou, 55, chongqing]
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