Jedis 對 Redis 的操做詳解
1. JedisUtil2. 鍵操做3. 字符串操做4. 字節串4. 整數和浮點數5. 列表6. 集合（Set）7. 散列8. 排序sortjava
本篇主要闡述Jedis對redis的五大類型的操做：字符串、列表、散列、集合、有序集合。redis
1. JedisUtil
這裏的測試用例採用junit4進行運行，準備代碼以下：apache
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作的簡單封裝，代碼以下：
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
{
//可用鏈接實例的最大數目，默認值爲8；
//若是賦值爲-1，則表示不限制；若是pool已經分配了maxActive個jedis實例，則此時pool的狀態爲exhausted(耗盡)。
public static int MAX_ACTIVE = 1024;
//控制一個pool最多有多少個狀態爲idle(空閒的)的jedis實例，默認值也是8。
public static int MAX_IDLE = 200;
//等待可用鏈接的最大時間，單位毫秒，默認值爲-1，表示永不超時。若是超過等待時間，則直接拋出JedisConnectionException；
public static int MAX_WAIT = 10000;
public static int TIMEOUT = 10000;
public static int RETRY_NUM = 5;
}
2. 鍵操做
@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("系統中全部的鍵以下：");
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的過時時間爲5s:"+jedis.expire("username", 5));
TimeUnit.SECONDS.sleep(2);
System.out.println("查看鍵username的剩餘生存時間："+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的剩餘生存時間："+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：app
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
系統中全部的鍵以下：[username, password]
刪除鍵password:1
判斷鍵password是否存在：false
設置鍵username的過時時間爲5s:1
查看鍵username的剩餘生存時間：3
移除鍵username的生存時間：1
查看鍵username的剩餘生存時間：-1
查看鍵username所存儲的值的類型：string
3. 字符串操做
在Redis裏面，字符串能夠存儲三種類型的值：測試
-
字節串(byte string)this
-
整數atom
-
浮點數code
4. 字節串
@Test public void testString() throws InterruptedException
{
jedis.flushDB();
System.out.println("===========增長數據===========");
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後面加入值："+jedis.append("key3", "End"));
System.out.println("key3的值："+jedis.get("key3"));
System.out.println("增長多個鍵值對："+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("===========新增鍵值對並設置有效時間=============");
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，更新爲新值==========");//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("得到key2的值的字串："+jedis.getrange("key2", 2, 4));
}
輸出結果：blog
===========增長數據===========
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後面加入值：9
key3的值：value3End
增長多個鍵值對：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
===========新增鍵值對並設置有效時間=============
OK
value3
null
===========獲取原值，更新爲新值==========
value2
key2GetSet
得到key2的值的字串：y2G
4. 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：排序
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中不支持這一操做。
5. 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表明倒數第一個元素，-2表明倒數第二個元素
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 ，第二個參數爲刪除的個數（有重複時），後add進去的值先被刪，相似於出棧
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區間以外的元素："+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下標爲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));
}
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區間以外的元素：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下標爲2的元素：LinkedHashMap
===============================
sortedList排序前：[4, 7, 0, 2, 6, 3]
[0, 2, 3, 4, 6, 7]
sortedList排序後：[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。
6. 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的全部元素爲："+jedis.smembers("eleSet"));
System.out.println("刪除一個元素e0："+jedis.srem("eleSet", "e0"));
System.out.println("eleSet的全部元素爲："+jedis.smembers("eleSet"));
System.out.println("刪除兩個元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
System.out.println("eleSet的全部元素爲："+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的全部元素爲："+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並存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));
System.out.println("將eleSet1中刪除e2並存入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的並集:"+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的全部元素爲：[e3, e4, e1, e2, e0, e8, e7, e6, e5]
刪除一個元素e0：1
eleSet的全部元素爲：[e3, e4, e1, e2, e8, e7, e6, e5]
刪除兩個元素e7和e6：2
eleSet的全部元素爲：[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的全部元素爲：[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並存入eleSet3中：1
將eleSet1中刪除e2並存入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的並集:[e3, e4, e1, e2, e0, e8, e7, e5]
eleSet1和eleSet2的差集:[e7, e5]
關於Set還有一些其餘命令：srandmember, sdiffstore, sinterstore, sunionstore等。
7. 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的全部鍵值對爲："+jedis.hgetAll("hash"));//return Map<String,String>
System.out.println("散列hash的全部鍵爲："+jedis.hkeys("hash"));//return Set<String>
System.out.println("散列hash的全部值爲："+jedis.hvals("hash"));//return List<String>
System.out.println("將key6保存的值加上一個整數，若是key6不存在則添加key6："+jedis.hincrBy("hash", "key6", 6));
System.out.println("散列hash的全部鍵值對爲："+jedis.hgetAll("hash"));
System.out.println("將key6保存的值加上一個整數，若是key6不存在則添加key6："+jedis.hincrBy("hash", "key6", 3));
System.out.println("散列hash的全部鍵值對爲："+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的全部鍵值對爲："+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的全部鍵值對爲：{key4=value4, key3=value3, key5=value5, key2=value2, key1=value1}
散列hash的全部鍵爲：[key4, key3, key5, key2, key1]
散列hash的全部值爲：[value4, value3, value1, value2, value5]
將key6保存的值加上一個整數，若是key6不存在則添加key6：6
散列hash的全部鍵值對爲：{key4=value4, key3=value3, key6=6, key5=value5, key2=value2, key1=value1}
將key6保存的值加上一個整數，若是key6不存在則添加key6：9
散列hash的全部鍵值對爲：{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的全部鍵值對爲：{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中的全部元素："+jedis.zrange("zset", 0, -1));
System.out.println("zset中的全部元素："+jedis.zrangeWithScores("zset", 0, -1));
System.out.println("zset中的全部元素："+jedis.zrangeByScore("zset", 0,100));
System.out.println("zset中的全部元素："+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中的全部元素："+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中的全部元素："+jedis.zrange("zset", 0, -1));
}
輸出結果：
1
4
zset中的全部元素：[key5, key2, key1, key3, key4]
zset中的全部元素：[[[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中的全部元素：[key5, key2, key1, key3, key4]
zset中的全部元素：[[[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中的全部元素：[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中的全部元素：[key5, key1, key3, key4, key2]
有序集合還有諸如zinterstore, zunionstore, zremrangebyscore, zremrangebyrank, zrevrank, zrevrange, zrangebyscore等命令。
8. 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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