java中Redis5大基本類型的用法
阿新 • • 發佈:2018-04-23
collect spa nts trim ioe 差集 close 客戶 出棧
基本用法
通過Jedis(封裝了redis的Java客戶端)對redis進行操作。
Jedis工具類
public class JedisPoolUtil { private static JedisPool pool = null; static { //加載配置文件 InputStream in = JedisPoolUtil.class.getClassLoader().getResourceAsStream("redis.properties"); Properties pro = new Properties();try { pro.load(in); } catch (IOException e) { e.printStackTrace(); System.out.println("加載文件失敗"); } JedisPoolConfig poolConfig = new JedisPoolConfig(); //最大連接數 poolConfig.setMaxTotal(Integer.parseInt( pro.get("redis.maxTotal").toString()));//最大空閑連接數 poolConfig.setMaxIdle(Integer.parseInt( pro.get("redis.maxIdle").toString())); //最小空閑連接數 poolConfig.setMinIdle(Integer.parseInt( pro.get("redis.minIdle").toString())); pool = new JedisPool(poolConfig, pro.get("redis.url").toString(),Integer.parseInt( pro.get("redis.port") .toString())); } ?public static Jedis getJedis(){ return pool.getResource(); } public static void release(Jedis jedis){ if(null != jedis){ jedis.close(); } } }
redis配置文件
redis.maxTotal=100 redis.maxIdle=30 redis.minIdle=10 redis.url=192.168.202.200 redis.port=6379
String
public class StringTest { public Jedis jedis = JedisPoolUtil.getJedis(); @Test //添加和獲取 public void fun(){ jedis.set("num","1"); System.out.println(jedis.get("num")); } @Test //刪除值 public void fun1(){ jedis.del("num"); System.out.println(jedis.get("num")); } @Test //自減和自減 public void fun2(){ jedis.set("num","1"); System.out.println(jedis.get("num")); jedis.decr("num"); System.out.println(jedis.get("num")); jedis.incr("num"); jedis.incr("num"); System.out.println(jedis.get("num")); } @Test //加上/減去 一個數 //incrBy 返回的是修改之後的值如果原值是字符串不是數字,則會拋出異常 public void fun3(){ Long num = jedis.incrBy("num", 3); System.out.println(num); jedis.decrBy("num",10); ? System.out.println(jedis.get("num")); jedis.set("name","caopengfei"); //jedis.decrBy("name",1); } @Test //字符串拼接 public void fun4(){ Long len = jedis.append("name", "123"); System.out.println(len); System.out.println(jedis.get("name")); } }
Hash
public class HashTest { public Jedis jedis = JedisPoolUtil.getJedis(); ? // hash 操作的是map對象 // 適合存儲鍵值對象的信息 @Test //存值 參數第一個變量的名稱, map鍵名(key), map鍵值(value) // 調用hset public void fun() { Long num = jedis.hset("hash1", "username", "caopengfei"); System.out.println(num); String hget = jedis.hget("hash1", "username"); System.out.println(hget); } ? @Test //也可以存多個key // 調用hmset public void fun1() { Map<String, String> map = new HashMap<String, String>(); map.put("username", "caopengfei"); map.put("age", "25"); map.put("sex", "男"); String res = jedis.hmset("hash2", map); System.out.println(res);//ok } ? @Test //獲取hash中所有的值 public void fun2() { Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } ? @Test // 刪除hash中的鍵 可以刪除一個也可以刪除多個,返回的是刪除的個數 public void fun3() { Long num = jedis.hdel("hash2", "username", "age"); System.out.println(num); Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } ? @Test //增加hash中的鍵值對 public void fun4() { Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); jedis.hincrBy("hash2", "age", 10); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } ? @Test //判斷hash是否存在某個值 public void fun5() { System.out.println(jedis.hexists("hash2", "username")); System.out.println(jedis.hexists("hash2", "age")); } ? @Test //獲取hash中鍵值對的個數 public void fun6() { System.out.println(jedis.hlen("hash2")); } ? // 獲取一個hash中所有的key值 @Test public void fun7() { Set<String> hash2 = jedis.hkeys("hash2"); System.out.println(hash2); } ? // 獲取所有的value值 @Test public void fun8() { List<String> hash2 = jedis.hvals("hash2"); System.out.println(hash2); } }
List
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),後add進去的值先被刪,類似於出棧 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排序後:"+jedis.lrange("sortedList", 0, -1)); }
Set
/* * Set集合,和List類的區別就是 * set中不會出現重復的數據 * 他可以進行聚合操作效率比較高 * 其余的操作基本上和list相同 * * */ public class SetTest { public Jedis jedis = JedisPoolUtil.getJedis(); ? @Test /*添加元素刪除元素*/ public void fun(){ Long num = jedis.sadd("myset", "a", "a", "b","abc"); System.out.println(num); ? } @Test /*獲得元素*/ public void fun1(){ Set<String> myset = jedis.smembers("myset"); System.out.println(myset); } @Test /*移除元素*/ public void fun2(){ jedis.srem("myset","a","b"); Set<String> myset = jedis.smembers("myset"); System.out.println(myset); } @Test //判斷是否這個set中存在某個值 public void fun3(){ Boolean sismember = jedis.sismember("myset", "a"); System.out.println(sismember); } @Test //獲得A-B 獲得差集合 public void fun4(){ jedis.sadd("myset1","123","32","abc","def","123456","sdfasd"); jedis.sadd("myset2","abc","345","123","fda"); Set<String> sdiff = jedis.sdiff("myset1", "myset2"); System.out.println(sdiff); } @Test //獲得交集 public void fun5(){ Set<String> sinter = jedis.sinter("myset1", "myset2"); System.out.println(sinter); ? } @Test // 獲得並集合 public void fun6(){ Set<String> sunion = jedis.sunion("myset1", "myset2"); System.out.println(sunion); } @Test // 成員數量 public void fun7(){ System.out.println(jedis.scard("myset1")); } @Test // 獲得隨機的一個成員 public void fun8(){ System.out.println(jedis.srandmember("myset1")); } @Test // 將相差的成員放到一個新的set中同理交集和並集都可以後面均 // 加上一個store即可 // 並返回新的長度 public void fun9(){ System.out.println(jedis.sdiffstore("myset3","myset1","myset2")); System.out.println(jedis.smembers("myset3")); } }
SortedSet
/* 和set極為的類似,他們是字符串的集合,沒有重復的數據 差別是sortedset每個成員中都會有一個分數(score)與之關聯 ,redis正是通過分數來為集合中的成員進行從小到大的排序 sortedset中數據必須單一但是他的score可以是重復的 */ public class SortedsetTest { public Jedis jedis = JedisPoolUtil.getJedis(); // 添加元素 @Test public void fun(){ jedis.zadd("mysort",100.0, "zhangsan"); jedis.zadd("mysort",200.0,"lisi"); jedis.zadd("mysort",50.0,"wangwu"); Map<String ,Double>map = new HashMap<String ,Double>(); map.put("mutouliu",70.0); ? jedis.zadd("mysort",map); Set<String> mysort = jedis.zrange("mysort", 0, -1); System.out.println(mysort); Set<String> mysort1 = jedis.zrange("mysort", 1, 2); System.out.println(mysort1); } }
java中Redis5大基本類型的用法