java操作redis的五種資料型別
阿新 • • 發佈：2019-01-10
一、專案必備Jar包
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.6</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency>
二、例項與結構
1）遠端連線redis，清空資料庫 new Jedis(redis服務連線IP，埠)
private static Jedis jedis;
@Before
public void before(){
jedis= JedisConnectUtil.getJedis(JedisTest.URL,63**);
jedis.flushDB();
}2）String型別
@Test public void testString(){ //設定鍵 獲取鍵 get set jedis.set("steve","stevetao"); System.out.println("設定後值："+jedis.get("steve")); //追加鍵 append jedis.append("steve"," Is Good Man"); System.out.println("追加後值："+jedis.get("steve")); //刪除操作 del jedis.del("steve"); System.out.println("刪除後值："+jedis.get("steve")); //不存在就儲存， setnx msetnx jedis.setnx("steve","stevetao"); System.out.println("設定後值："+jedis.get("steve")); System.out.println("再次設定後值："+jedis.setnx("steve","stevetao")); //擷取字串 substr System.out.println("擷取後值："+jedis.substr("steve",0,4)); //設定多個鍵值對 mset mget jedis.mset(new String[]{"zhangsan","123","lisi","1234"}); System.out.println("多次設定後值："+jedis.mget("zhangsan","lisi")); //遞增遞減 incr decr incrby decrby jedis.incr("zhangsan"); jedis.decr("lisi"); System.out.println("遞增遞減後值："+jedis.mget("zhangsan","lisi")); jedis.incrBy("zhangsan",6); jedis.decrBy("lisi",3); System.out.println("遞增遞減後值："+jedis.mget("zhangsan","lisi")); }
3）List型別
@Test public void testList(){ //尾新增 rpush 頭新增 lpush jedis.lpush("books","java","C++","Ruby","Scala","python"); jedis.rpush("language","java","C++","Ruby","Scala","python"); // -1 表示列表的最後一個元素， -2 表示列表的倒數第二個元素，以此類推。 System.out.println("頭新增後books值:"+jedis.lrange("books",0,-1)); System.out.println("尾新增後language值:"+jedis.lrange("language",0,-1)); //尾部刪除 rpop 頭部刪除 lpop System.out.println("刪除的值為："+jedis.lpop("books")); System.out.println("刪除的值為："+jedis.rpop("language")); System.out.println("頭部刪除後books值:"+jedis.lrange("books",0,-1)); System.out.println("尾部刪除後language值:"+jedis.lrange("language",0,-1)); //尾部刪除並頭新增 rpoplpush jedis.rpoplpush("language","books"); System.out.println("尾部刪除並頭新增後books值:"+jedis.lrange("books",0,-1)); System.out.println("尾部刪除並頭新增後language值:"+jedis.lrange("language",0,-1)); //區別: 只能給存在的list做新增，不能項lpush那樣能新增list jedis.lpushx("books","php"); jedis.lpushx("book","php"); System.out.println("頭新增後books值:"+jedis.lrange("books",0,-1)); System.out.println("頭新增後book值:"+jedis.lrange("book",0,-1)); //獲取集合長度 llen 指定索引的值 lindex 保留擷取的值 ltrim System.out.println("books集合長度:"+jedis.llen("books")); System.out.println("books集合第二個數值:"+jedis.lindex("books",1)); jedis.ltrim("books",0,2); System.out.println("擷取後books值:"+jedis.lrange("books",0,-1)); }
4）Hash型別
@Test
public void testHash(){
//適合欄位：設值hset 取值hget（如果value是json字串，類似儲存物件）
jedis.hset("student","name","zhangsan");
System.out.println("student中name的值為："+jedis.hget("student","name"));
//適合物件：設值hmset 取值hmget
Map<String,String> map = new HashMap<String,String>();
map.put("name", "lisi");
map.put("age", "36");
jedis.hmset("teacher",map);
System.out.println("teacher中name、age的值為："+jedis.hmget("teacher","name","age"));
//teacher是否存在鍵age hexists
if(jedis.hexists("teacher","age")){
//給指定值增加4 hincrBy
jedis.hincrBy("teacher","age",4);
System.out.println("teacher中name、age的值為："+jedis.hmget("teacher","name","age"));
}
//返回key的個數hlen 返回值hvals 返回鍵hkeys 鍵值對hgetAll
jedis.hset("student","age","13");
jedis.hset("student","qq","2246920330");
jedis.hset("student","address","beijing");
System.out.println("student中鍵的個數為："+jedis.hlen("student"));
System.out.println("student中所有的鍵為："+jedis.hkeys("student"));
System.out.println("student中所有的值為："+jedis.hvals("student"));
System.out.println("student中所有的鍵值對為："+jedis.hgetAll("student"));
//刪除 hdel
jedis.hdel("student",new String[]{"address","qq","age"});
System.out.println("刪除後，student中所有的鍵值對為："+jedis.hgetAll("student"));
}
5）Set型別
@Test
public void testSet(){
//set中新增值 sadd 取值 smembers
jedis.sadd("student","Jan","John","Steve","jack","lili","peter","Anna");
jedis.sadd("girls","Jan","lili","Alice","Jeanne","Anna");
System.out.println("排名不分先後："+jedis.smembers("student"));
//set個數 scard 是否存在某個值 sismember
System.out.println("set集合的個數："+jedis.scard("student"));
System.out.println("student是否存在steve："+jedis.sismember("student","Steve"));
System.out.println("student是否存在stevetao："+jedis.sismember("student","Stevetao"));
//System.out.println(jedis.sscan("student","0").getResult());
//刪除指定的值 srem 隨機刪除並返回 spop
System.out.println("刪除指定的值Steve："+jedis.srem("student","Steve"));
System.out.println("刪除的值為："+jedis.spop("student"));
System.out.println("再次排名不分先後："+jedis.smembers("student"));
//集合操作
System.out.println("兩個set的交集："+jedis.sinter("student","girls"));
System.out.println("兩個set的並集："+jedis.sunion("student","girls"));
System.out.println("student對girls的差集："+jedis.sdiff("student","girls"));
System.out.println("girls對student的差集："+jedis.sdiff("girls","student"));
//集合操作並儲存
jedis.sinterstore("jiaoji","student","girls");
jedis.sunionstore("bingji","student","girls");
jedis.sdiffstore("chaji","student","girls");
System.out.println("交集："+jedis.smembers("jiaoji"));
System.out.println("並集："+jedis.smembers("bingji"));
System.out.println("student對girls的差集："+jedis.smembers("chaji"));
}
6）ZSet型別
@Test
public void testZset(){
jedis.zadd("math",75,"Jim");
jedis.zadd("math",86,"Lina");
jedis.zadd("math",52,"Dive");
jedis.zadd("math",91,"Bobber");
System.out.println("有序集合的成員數:"+jedis.zcard("math"));
System.out.println("有序集合的成員:"+jedis.zrevrangeByScore("math",100,0));
//返回set<Tuple>
System.out.println("有序集合的成員:"+jedis.zrangeWithScores("math",0,100));
}
這些簡單的操作，可以找下API文件，每一個都試一遍。基本上和Linux裡的命令相差不大，如果命令熟了，那麼使用jedis應該很快就能上手了。