Jedis针对redis的操作

JedisUtil

这里的测试用例采用junit4进行运行，准备代码如下：

privatestatic final String ipAddr = "10.10.195.112";
    privatestatic final int port = 6379;
    privatestatic Jedis jedis= null;

    @BeforeClass
    publicstatic void init()
    {
        jedis = JedisUtil.getInstance().getJedis(ipAddr, port);
    }

    @AfterClass
    publicstatic void close()
    {
        JedisUtil.getInstance().closeJedis(jedis,ipAddr, port);
    }

其中JedisUtil是对jedis做的简单封装，代码如下：

importorg.apache.log4j.Logger;

importjava.util.HashMap;
importjava.util.Map;

importredis.clients.jedis.Jedis;
importredis.clients.jedis.JedisPool;
importredis.clients.jedis.JedisPoolConfig;

publicclass JedisUtil
{
    privateLogger logger = Logger.getLogger(this.getClass().getName());

    privateJedisUtil(){}

    privatestatic class RedisUtilHolder{
        privatestatic final JedisUtil instance = newJedisUtil();
    }

    publicstatic JedisUtil getInstance(){
        returnRedisUtilHolder.instance;
    }

    privatestatic Map<String,JedisPool> maps = newHashMap<String,JedisPool>();

    privatestatic JedisPool getPool(String ip, intport){
        String key = ip+":"+port;
        JedisPool pool = null;
        if(!maps.containsKey(key))
        {
            JedisPoolConfig config = newJedisPoolConfig();
            config.setMaxActive(RedisConfig.MAX_ACTIVE);
            config.setMaxIdle(RedisConfig.MAX_IDLE);
            config.setMaxWait(RedisConfig.MAX_WAIT);
            config.setTestOnBorrow(true);
            config.setTestOnReturn(true);

            pool = newJedisPool(config,ip,port,RedisConfig.TIMEOUT);
            maps.put(key, pool);
        }
        else
        {
            pool = maps.get(key);
        }
        returnpool;
    }

    publicJedis getJedis(String ip, intport)
    {
        Jedis jedis = null;
        intcount = 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);
        returnjedis;
    }

    publicvoid closeJedis(Jedis jedis, String ip, intport){
        if(jedis != null)
        {
            getPool(ip,port).returnResource(jedis);
        }
    }
}

publicclass 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)。
    publicstatic 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。
    publicstatic 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；
    publicstatic int MAX_WAIT = 10000;

    publicstatic int TIMEOUT = 10000;

    publicstatic int RETRY_NUM = 5;
}

键操作

@Testpublic void testKey() throwsInterruptedException
   {
       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

@Testpublic void testString() throwsInterruptedException
  {
      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(newString[]{"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

@Testpublic 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

@Testpublic 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）

@Testpublic 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

@Testpublic void testHash()
    {
        jedis.flushDB();
        Map<String,String> map = newHashMap<>();
        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

@Testpublic void testSortedSet()
    {
        jedis.flushDB();
        Map<Double,String> map = newHashMap<>();
        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

@Testpublic 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 = newSortingParams();
      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 = newSortingParams();
      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]