Jedis對Redis的經常使用命令操做

本篇主要總結一些Jedis對Redis的經常使用命令操做：

1.對key操做命令 

2.對String操做命令 

3.對List操做命令 

4.對Set操做命令 

5.對Hash操做命令 

6.排序操做指令

1、項目中添加redis和junit的依賴。

1 <dependency>
2    <groupId>redis.clients</groupId>
3    <artifactId>jedis</artifactId>
4    <version>2.9.0</version>
5 </dependency>
6 <dependency>
7    <groupId>junit</groupId>
8    <artifactId>junit</artifactId>
9 </dependency>

 2、建立JedisUtil工具類。

 1 import redis.clients.jedis.Jedis;
 2 import redis.clients.jedis.JedisPool;
 3 import redis.clients.jedis.JedisPoolConfig;
 4 
 5 import java.util.HashMap;
 6 import java.util.Map;
 7 
 8 /**
 9  * @Author guoyuanhao
10  * @Date 2018/4/8 18:41
11  */
12 public class JedisUtil {
13 
14     private static JedisUtil jedisUtil;
15 
16     private JedisUtil(){};
17 
18     public static JedisUtil getInstance(){
19         if (jedisUtil == null){
20             synchronized(JedisUtil.class){
21                 if (jedisUtil == null){
22                     jedisUtil = new JedisUtil();
23                 }
24             }
25         }
26         return jedisUtil;
27     }
28 
29     //Jedis的鏈接池
30     private static Map<String,JedisPool> maps = new HashMap<String,JedisPool>();
31 
32     private static JedisPool getPool(String ip, int port){
33         String key = ip+":"+port;
34         JedisPool pool = null;
35         if(!maps.containsKey(key)){
36             JedisPoolConfig config = new JedisPoolConfig();
37             config.setMaxIdle(RedisConfig.MAX_IDLE);
38             config.setMinIdle(RedisConfig.MIN_IDLE);
39             config.setMaxTotal(RedisConfig.MAX_TOTAL);
40             config.setMaxWaitMillis(RedisConfig.MAX_WAIT);
41             config.setTestOnBorrow(true);
42             config.setTestOnReturn(true);
43 
44             pool = new JedisPool(config,ip,port,RedisConfig.TIMEOUT);
45             maps.put(key, pool);
46         }else{
47             pool = maps.get(key);
48         }
49         return pool;
50     }
51 
52     public Jedis getJedis(String ip, int port){
53         Jedis jedis = null;
54         int count = 0;
55         do{
56             try{
57                 jedis = getPool(ip,port).getResource();
58             }catch (Exception e){
59                 getPool(ip,port).returnBrokenResource(jedis);
60             }
61         }while(jedis == null && count<RedisConfig.RETRY_NUM);
62         return jedis;
63     }
64 
65     public void closeJedis(Jedis jedis, String ip, int port){
66         if(jedis != null){
67             getPool(ip,port).returnResource(jedis);
68         }
69     }
70 
71     public static class RedisConfig {
72         //最大實例總數
73         public static int MAX_TOTAL = 150;
74 
75         //最大空閒鏈接數, 默認8個
76         public static int MAX_IDLE = 100;
77 
78         //最小空閒鏈接數, 默認8個
79         public static int MIN_IDLE = 10;
80 
81         //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；
82         public static int MAX_WAIT = 10000;
83 
84         public static int TIMEOUT = 10000;
85 
86         public static int RETRY_NUM = 5;
87 
88         public RedisConfig(){};
89     }
90 }

3、用Juint單元測試命令操做
1.靜態變量，ip,端口號。

1 private static final String ipAddr = "192.168.16.142";
2 private static final int port = 6379;
3 private static Jedis jedis = null;

2.測試類方法執行以前從鏈接池中獲取jedis對象，執行以後關閉jedis對象。

1 @Before
2 public void init() { jedis = JedisUtil.getInstance().getJedis(ipAddr, port); }
3 @After
4 public void close() { JedisUtil.getInstance().closeJedis(jedis,ipAddr, port); }

3.單元測試
　　3.1.對key操做的命令

 1 @Test
 2 public void testKey(){
 3     System.out.println("清空數據："+jedis.flushDB());
 4     System.out.println("判斷某個鍵是否存在："+jedis.exists("username"));
 5     System.out.println("新增<'username','zzh'>的鍵值對："+jedis.set("username", "zzh"));
 6     System.out.println("新增<'password','password'>的鍵值對："+jedis.set("password", "password"));
 7     System.out.print("系統中全部的鍵以下：");
 8     Set<String> keys = jedis.keys("*");
 9     System.out.println(keys);
10     System.out.println("刪除鍵password:"+jedis.del("password"));
11     System.out.println("判斷鍵password是否存在："+jedis.exists("password"));
12     System.out.println("查看鍵username所存儲的值的類型："+jedis.type("username"));
13     System.out.println("隨機返回key空間的一個："+jedis.randomKey());
14     System.out.println("重命名key："+jedis.rename("username","name"));
15     System.out.println("取出改後的name："+jedis.get("name"));
16     System.out.println("按索引查詢："+jedis.select(0));
17     System.out.println("刪除當前選擇數據庫中的全部key："+jedis.flushDB());
18     System.out.println("返回當前數據庫中key的數目："+jedis.dbSize());
19     System.out.println("刪除全部數據庫中的全部key："+jedis.flushAll());
20 }

　　3.2.對String操做的命令

 1 @Test
 2 public void testString(){
 3     jedis.flushDB();
 4     System.out.println("===========增長數據===========");
 5     System.out.println(jedis.set("key1","value1"));
 6     System.out.println(jedis.set("key2","value2"));
 7     System.out.println(jedis.set("key3", "value3"));
 8     System.out.println("刪除鍵key2:"+jedis.del("key2"));
 9     System.out.println("獲取鍵key2:"+jedis.get("key2"));
10     System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
11     System.out.println("獲取key1的值："+jedis.get("key1"));
12     System.out.println("在key3後面加入值："+jedis.append("key3", "End"));
13     System.out.println("key3的值："+jedis.get("key3"));
14     System.out.println("增長多個鍵值對："+jedis.mset("key01","value01","key02","value02","key03","value03"));
15     System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03"));
16     System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03","key04"));
17     System.out.println("刪除多個鍵值對："+jedis.del(new String[]{"key01","key02"}));
18     System.out.println("獲取多個鍵值對："+jedis.mget("key01","key02","key03"));
19 
20     jedis.flushDB();
21     System.out.println("===========新增鍵值對防止覆蓋原先值==============");
22     System.out.println(jedis.setnx("key1", "value1"));
23     System.out.println(jedis.setnx("key2", "value2"));
24     System.out.println(jedis.setnx("key2", "value2-new"));
25     System.out.println(jedis.get("key1"));
26     System.out.println(jedis.get("key2"));
27 
28     System.out.println("===========新增鍵值對並設置有效時間=============");
29     System.out.println(jedis.setex("key3", 2, "value3"));
30     System.out.println(jedis.get("key3"));
31     try {
32         TimeUnit.SECONDS.sleep(3);
33     } catch (InterruptedException e) {
34         e.printStackTrace();
35     }
36     System.out.println(jedis.get("key3"));
37 
38     System.out.println("===========獲取原值，更新爲新值==========");
39     System.out.println(jedis.getSet("key2", "key2GetSet"));
40     System.out.println(jedis.get("key2"));
41 
42     System.out.println("得到key2的值的字串："+jedis.getrange("key2", 2, 4));
43 }

　　3.3.對List操做命令

 1 @Test
 2 public void testList(){
 3     jedis.flushDB();
 4     System.out.println("===========添加一個list===========");
 5     //jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
 6     jedis.lpush("collections", "HashSet");
 7     jedis.lpush("collections", "TreeSet");
 8     jedis.lpush("collections", "TreeMap");
 9     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,end爲-1表示查詢所有
10     System.out.println("collections區間0-3的元素："+jedis.lrange("collections",0,3));
11     System.out.println("===============================");
12     // 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
13     System.out.println("刪除指定元素個數："+jedis.lrem("collections", 2, "HashMap"));
14     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
15     System.out.println("刪除下表0-3區間以外的元素："+jedis.ltrim("collections", 0, 3));
16     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
17     System.out.println("collections列表出棧（左端）："+jedis.lpop("collections"));
18     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
19     System.out.println("collections添加元素，從列表右端，與lpush相對應："+jedis.rpush("collections", "EnumMap"));
20     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
21     System.out.println("collections列表出棧（右端）："+jedis.rpop("collections"));
22     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
23     System.out.println("修改collections指定下標1的內容："+jedis.lset("collections", 1, "LinkedArrayList"));
24     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
25     System.out.println("===============================");
26     System.out.println("collections的長度："+jedis.llen("collections"));
27     System.out.println("獲取collections下標爲2的元素："+jedis.lindex("collections", 2));
28     System.out.println("===============================");
29     //jedis.lpush("sortedList", "3","6","2","0","7","4");
30     System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
31     System.out.println(jedis.sort("sortedList"));
32     System.out.println("sortedList排序後："+jedis.lrange("sortedList", 0, -1));
33 }

　　3.4.對Set的操做命令

 1 @Test
 2 public void testSet(){
 3     jedis.flushDB();
 4     System.out.println("============向集合中添加元素（不重複）============");
 5     System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
 6     System.out.println(jedis.sadd("eleSet", "e6"));
 7     System.out.println(jedis.sadd("eleSet", "e6"));
 8     System.out.println("eleSet的全部元素爲："+jedis.smembers("eleSet"));
 9     System.out.println("刪除一個元素e0："+jedis.srem("eleSet", "e0"));
10     System.out.println("eleSet的全部元素爲："+jedis.smembers("eleSet"));
11     System.out.println("刪除兩個元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
12     System.out.println("eleSet的全部元素爲："+jedis.smembers("eleSet"));
13     System.out.println("隨機的移除集合中的一個元素："+jedis.spop("eleSet"));
14     System.out.println("隨機的移除集合中的一個元素："+jedis.spop("eleSet"));
15     System.out.println("eleSet的全部元素爲："+jedis.smembers("eleSet"));
16     System.out.println("eleSet中包含元素的個數："+jedis.scard("eleSet"));
17     System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
18     System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
19     System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
20     System.out.println("=================================");
21     System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
22     System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
23     System.out.println("將eleSet1中刪除e1並存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));//移到集合元素
24     System.out.println("將eleSet1中刪除e2並存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
25     System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
26     System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
27     System.out.println("============集合運算=================");
28     System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
29     System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
30     System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
31     System.out.println("eleSet1和eleSet2的並集:"+jedis.sunion("eleSet1","eleSet2"));
32     System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有，eleSet2中沒有
33     jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集並將交集保存到dstkey的集合
34     System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4"));
35 }

　　3.5.對Hash的操做命令

 1 @Test
 2 public void testHash(){
 3     jedis.flushDB();
 4     Map<String,String> map = new HashMap<>();
 5     map.put("key1","value1");
 6     map.put("key2","value2");
 7     map.put("key3","value3");
 8     map.put("key4","value4");
 9     //添加名稱爲hash（key）的hash元素
10     jedis.hmset("hash",map);
11     //向名稱爲hash的hash中添加key爲key5，value爲value5元素
12     jedis.hset("hash", "key5", "value5");
13     System.out.println("散列hash的全部鍵值對爲："+jedis.hgetAll("hash"));//return Map<String,String>
14     System.out.println("散列hash的全部鍵爲："+jedis.hkeys("hash"));//return Set<String>
15     System.out.println("散列hash的全部值爲："+jedis.hvals("hash"));//return List<String>
16     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));
17     System.out.println("散列hash的全部鍵值對爲："+jedis.hgetAll("hash"));
18     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));
19     System.out.println("散列hash的全部鍵值對爲："+jedis.hgetAll("hash"));
20     System.out.println("刪除一個或者多個鍵值對："+jedis.hdel("hash", "key2"));
21     System.out.println("散列hash的全部鍵值對爲："+jedis.hgetAll("hash"));
22     System.out.println("散列hash中鍵值對的個數："+jedis.hlen("hash"));
23     System.out.println("判斷hash中是否存在key2："+jedis.hexists("hash","key2"));
24     System.out.println("判斷hash中是否存在key3："+jedis.hexists("hash","key3"));
25     System.out.println("獲取hash中的值："+jedis.hmget("hash","key3"));
26     System.out.println("獲取hash中的值："+jedis.hmget("hash","key3","key4"));
27 }

　　3.6.排序操做指令

 1 @Test
 2 public void testSort(){
 3     jedis.flushDB();
 4     //jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
 5     jedis.lpush("collections","ArrayList");
 6     jedis.lpush("collections","Vector");
 7     jedis.lpush("collections","Stack");
 8     jedis.lpush("collections","HashMap");
 9     jedis.lpush("collections","WeakHashMap");
10     jedis.lpush("collections","LinkedHashMap");
11     System.out.println("collections的內容："+jedis.lrange("collections", 0, -1));
12     SortingParams sortingParameters = new SortingParams();
13     System.out.println(jedis.sort("collections",sortingParameters.alpha()));
14     System.out.println("===============================");
15     //jedis.lpush("sortedList", "3","6","2","0","7","4");
16     jedis.lpush("sortedList","3");
17     jedis.lpush("sortedList","6");
18     jedis.lpush("sortedList","2");
19     jedis.lpush("sortedList","0");
20     jedis.lpush("sortedList","7");
21     jedis.lpush("sortedList","4");
22     System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
23     System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
24     System.out.println("降序："+jedis.sort("sortedList", sortingParameters.desc()));
25 }