《Dubbo 实现原理与源码解析 —— 精品合集》 《Netty 实现原理与源码解析 —— 精品合集》
《Spring 实现原理与源码解析 —— 精品合集》 《MyBatis 实现原理与源码解析 —— 精品合集》
《数据库实体设计合集》

摘要: 原创出处 https://blog.csdn.net/u013256816/article/details/51125842 「朱小厮」欢迎转载,保留摘要,谢谢!


🙂🙂🙂关注微信公众号:【芋道源码】有福利:

  1. RocketMQ / MyCAT / Sharding-JDBC 所有源码分析文章列表
  2. RocketMQ / MyCAT / Sharding-JDBC 中文注释源码 GitHub 地址
  3. 您对于源码的疑问每条留言将得到认真回复。甚至不知道如何读源码也可以请教噢
  4. 新的源码解析文章实时收到通知。每周更新一篇左右
  5. 认真的源码交流微信群。

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。

1. 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;
}

2. 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

3. 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

4. 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

4. 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。

5. 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。

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。

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。

8. 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]
文章目录
  1. 1. 1. JedisUtil
  2. 2. 2. 键操作
  3. 3. 3. 字符串操作
  4. 4. 4. 字节串
  5. 5. 4. 整数和浮点数
  6. 6. 5. 列表
  7. 7. 6. 集合(Set)
  8. 8. 7. 散列
  9. 9. 8. 排序sort