Jedis对redis的五大类型操作代码详解

2020年2月25日05:14:37Jedis对redis的五大类型操作代码详解已关闭评论 191 17212字阅读57分22秒
摘要

这篇文章主要介绍了Jedis对redis的五大操作代码详解,分别是字符串、列表、散列、集合、有序集合,具有一定参考价值,需要的同学可以了解下。

本篇主要阐述Jedis对redis的五大类型的操作:字符串、列表、散列、集合、有序集合。

JedisUtil

这里的测试用例采用junit4进行运行,准备代码如下:

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是对jedis做的简单封装,代码如下:

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
{
	//可用连接实例的最大数目,默认值为8;
	//如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。
	public static int MAX_ACTIVE = 1024;
	//控制一个pool最多有多少个状态为idle(空闲的)的jedis实例,默认值也是8。
	public static int MAX_IDLE = 200;
	//等待可用连接的最大时间,单位毫秒,默认值为-1,表示永不超时。如果超过等待时间,则直接抛出JedisConnectionException;
	public static int MAX_WAIT = 10000;
	public static int TIMEOUT = 10000;
	public static int RETRY_NUM = 5;
}

键操作

@Test public void testKey() throws InterruptedException
  {
    System.out.println("清空数据:"+jedis.flushDB());
    System.out.println("判断某个键是否存在:"+jedis.exists("username"));
    System.out.println("新增<'username','zzh'>的键值对:"+jedis.set("username", "zzh"));
    System.out.println(jedis.exists("name"));
    System.out.println("新增<'password','password'>的键值对:"+jedis.set("password", "password"));
    System.out.print("系统中所有的键如下:");
    Set<String> keys = jedis.keys("*");
    System.out.println(keys);
    System.out.println("删除键password:"+jedis.del("password"));
    System.out.println("判断键password是否存在:"+jedis.exists("password"));
    System.out.println("设置键username的过期时间为5s:"+jedis.expire("username", 5));
    TimeUnit.SECONDS.sleep(2);
    System.out.println("查看键username的剩余生存时间:"+jedis.ttl("username"));
    System.out.println("移除键username的生存时间:"+jedis.persist("username"));
    System.out.println("查看键username的剩余生存时间:"+jedis.ttl("username"));
    System.out.println("查看键username所存储的值的类型:"+jedis.type("username"));
  }

输出结果:

清空数据:OK
判断某个键是否存在:false
新增<'username','zzh'>的键值对:OK
false
新增<'password','password'>的键值对:OK
系统中所有的键如下:[username, password]
删除键password:1
判断键password是否存在:false
设置键username的过期时间为5s:1
查看键username的剩余生存时间:3
移除键username的生存时间:1
查看键username的剩余生存时间:-1
查看键username所存储的值的类型:string

字符串操作

在Redis里面,字符串可以存储三种类型的值:

字节串(byte string)
整数
浮点数
字节串

@Test public void testString() throws InterruptedException
 {
	jedis.flushDB();
	System.out.println("===========增加数据===========");
	System.out.println(jedis.set("key1","value1"));
	System.out.println(jedis.set("key2","value2"));
	System.out.println(jedis.set("key3", "value3"));
	System.out.println("删除键key2:"+jedis.del("key2"));
	System.out.println("获取键key2:"+jedis.get("key2"));
	System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
	System.out.println("获取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("增加多个键值对:"+jedis.mset("key01","value01","key02","value02","key03","value03"));
	System.out.println("获取多个键值对:"+jedis.mget("key01","key02","key03"));
	System.out.println("获取多个键值对:"+jedis.mget("key01","key02","key03","key04"));
	System.out.println("删除多个键值对:"+jedis.del(new String[]{
		"key01","key02"
	}
	));
	System.out.println("获取多个键值对:"+jedis.mget("key01","key02","key03"));
	jedis.flushDB();
	System.out.println("===========新增键值对防止覆盖原先值==============");
	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("===========新增键值对并设置有效时间=============");
	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("===========获取原值,更新为新值==========");
	//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("获得key2的值的字串:"+jedis.getrange("key2", 2, 4));
}

输出结果:

===========增加数据===========
OK
OK
OK
删除键key2:1
获取键key2:null
修改key1:OK
获取key1的值:value1Changed
在key3后面加入值:9
key3的值:value3End
增加多个键值对:OK
获取多个键值对:[value01, value02, value03]
获取多个键值对:[value01, value02, value03, null]
删除多个键值对:2
获取多个键值对:[null, null, value03]
===========新增键值对防止覆盖原先值==============
1
1
0
value1
value2
===========新增键值对并设置有效时间=============
OK
value3
null
===========获取原值,更新为新值==========
value2
key2GetSet
获得key2的值的字串:y2G

memcached和redis同样有append的操作,但是memcached有prepend的操作,redis中并没有。

整数和浮点数

@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("获取key1的值:"+jedis.get("key1"));
    System.out.println("key2的值减1:"+jedis.decr("key2"));
    System.out.println("获取key2的值:"+jedis.get("key2"));
    System.out.println("将key1的值加上整数5:"+jedis.incrBy("key1", 5));
    System.out.println("获取key1的值:"+jedis.get("key1"));
    System.out.println("将key2的值减去整数5:"+jedis.decrBy("key2", 5));
    System.out.println("获取key2的值:"+jedis.get("key2"));
  }

输出结果:

key1的值:1
key2的值:2
key1的值加1:2
获取key1的值:2
key2的值减1:1
获取key2的值:1
将key1的值加上整数5:7
获取key1的值:7
将key2的值减去整数5:-4
获取key2的值:-4

在redis2.6或以上版本中有这个命令:incrbyfloat,即将键存储的值加上浮点数amount,jedis-2.1.0中不支持这一操作。

列表

@Test public void testList()
{
  jedis.flushDB();
  System.out.println("===========添加一个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的内容:"+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素,-2代表倒数第二个元素
  System.out.println("collections区间0-3的元素:"+jedis.lrange("collections",0,3));
  System.out.println("===============================");
  // 删除列表指定的值 ,第二个参数为删除的个数(有重复时),后add进去的值先被删,类似于出栈
  System.out.println("删除指定元素个数:"+jedis.lrem("collections", 2, "HashMap"));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("删除下表0-3区间之外的元素:"+jedis.ltrim("collections", 0, 3));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("collections列表出栈(左端):"+jedis.lpop("collections"));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("collections添加元素,从列表右端,与lpush相对应:"+jedis.rpush("collections", "EnumMap"));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("collections列表出栈(右端):"+jedis.rpop("collections"));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("修改collections指定下标1的内容:"+jedis.lset("collections", 1, "LinkedArrayList"));
  System.out.println("collections的内容:"+jedis.lrange("collections", 0, -1));
  System.out.println("===============================");
  System.out.println("collections的长度:"+jedis.llen("collections"));
  System.out.println("获取collections下标为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));
}

输出结果:

===========添加一个list===========
collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList]
collections区间0-3的元素:[TreeMap, TreeSet, HashSet, LinkedHashMap]
===============================
删除指定元素个数:1
collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, Stack, Vector, ArrayList]
删除下表0-3区间之外的元素:OK
collections的内容:[TreeMap, TreeSet, HashSet, LinkedHashMap]
collections列表出栈(左端):TreeMap
collections的内容:[TreeSet, HashSet, LinkedHashMap]
collections添加元素,从列表右端,与lpush相对应:4
collections的内容:[TreeSet, HashSet, LinkedHashMap, EnumMap]
collections列表出栈(右端):EnumMap
collections的内容:[TreeSet, HashSet, LinkedHashMap]
修改collections指定下标1的内容:OK
collections的内容:[TreeSet, LinkedArrayList, LinkedHashMap]
===============================
collections的长度:3
获取collections下标为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中还有阻塞式的列表弹出命令以及在列表之间移动元素的命令: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的所有元素为:"+jedis.smembers("eleSet"));
   System.out.println("删除一个元素e0:"+jedis.srem("eleSet", "e0"));
   System.out.println("eleSet的所有元素为:"+jedis.smembers("eleSet"));
   System.out.println("删除两个元素e7和e6:"+jedis.srem("eleSet", "e7","e6"));
   System.out.println("eleSet的所有元素为:"+jedis.smembers("eleSet"));
   System.out.println("随机的移除集合中的一个元素:"+jedis.spop("eleSet"));
   System.out.println("随机的移除集合中的一个元素:"+jedis.spop("eleSet"));
   System.out.println("eleSet的所有元素为:"+jedis.smembers("eleSet"));
   System.out.println("eleSet中包含元素的个数:"+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("将eleSet1中删除e1并存入eleSet3中:"+jedis.smove("eleSet1", "eleSet3", "e1"));
   System.out.println("将eleSet1中删除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("============集合运算=================");
   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中没有
 }

输出结果:

============向集合中添加元素============
8
1
0
eleSet的所有元素为:[e3, e4, e1, e2, e0, e8, e7, e6, e5]
删除一个元素e0:1
eleSet的所有元素为:[e3, e4, e1, e2, e8, e7, e6, e5]
删除两个元素e7和e6:2
eleSet的所有元素为:[e3, e4, e1, e2, e8, e5]
随机的移除集合中的一个元素:e5
随机的移除集合中的一个元素:e2
eleSet的所有元素为:[e3, e4, e1, e8]
eleSet中包含元素的个数:4
e3是否在eleSet中:true
e1是否在eleSet中:true
e1是否在eleSet中:false
=================================
8
6
将eleSet1中删除e1并存入eleSet3中:1
将eleSet1中删除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]
============集合运算=================
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]

关于Set还有一些其他命令: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的所有键值对为:"+jedis.hgetAll("hash"));//return Map<String,String>
    System.out.println("散列hash的所有键为:"+jedis.hkeys("hash"));//return Set<String>
    System.out.println("散列hash的所有值为:"+jedis.hvals("hash"));//return List<String>
    System.out.println("将key6保存的值加上一个整数,如果key6不存在则添加key6:"+jedis.hincrBy("hash", "key6", 6));
    System.out.println("散列hash的所有键值对为:"+jedis.hgetAll("hash"));
    System.out.println("将key6保存的值加上一个整数,如果key6不存在则添加key6:"+jedis.hincrBy("hash", "key6", 3));
    System.out.println("散列hash的所有键值对为:"+jedis.hgetAll("hash"));
    System.out.println("删除一个或者多个键值对:"+jedis.hdel("hash", "key2"));
    System.out.println("散列hash的所有键值对为:"+jedis.hgetAll("hash"));
    System.out.println("散列hash中键值对的个数:"+jedis.hlen("hash"));
    System.out.println("判断hash中是否存在key2:"+jedis.hexists("hash","key2"));
    System.out.println("判断hash中是否存在key3:"+jedis.hexists("hash","key3"));
    System.out.println("获取hash中的值:"+jedis.hmget("hash","key3"));
    System.out.println("获取hash中的值:"+jedis.hmget("hash","key3","key4"));
  }

输出结果:

散列hash的所有键值对为:{key4=value4, key3=value3, key5=value5, key2=value2, key1=value1}
散列hash的所有键为:[key4, key3, key5, key2, key1]
散列hash的所有值为:[value4, value3, value1, value2, value5]
将key6保存的值加上一个整数,如果key6不存在则添加key6:6
散列hash的所有键值对为:{key4=value4, key3=value3, key6=6, key5=value5, key2=value2, key1=value1}
将key6保存的值加上一个整数,如果key6不存在则添加key6:9
散列hash的所有键值对为:{key4=value4, key3=value3, key6=9, key5=value5, key2=value2, key1=value1}
删除一个或者多个键值对:1
散列hash的所有键值对为:{key4=value4, key3=value3, key6=9, key5=value5, key1=value1}
散列hash中键值对的个数:5
判断hash中是否存在key2:false
判断hash中是否存在key3:true
获取hash中的值:[value3]
获取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("删除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中元素的个数:"+jedis.zcard("zset"));
    System.out.println("zset中分值在1-4之间的元素的个数:"+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));
  }

输出结果:

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
删除zset中的元素key3:1
zset中的所有元素:[key5, key2, key1, key4]
zset中元素的个数:4
zset中分值在1-4之间的元素的个数: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]

有序集合还有诸如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的内容:"+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));
 }

输出结果:

collections的内容:[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]

总结

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Redis的主从同步解析

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