面试官：讲讲Redis的五大数据类型？如何使用？（内含完整测试源码） (2)

接下来，我们给出使用JedisCluster测试Redis五大数据类型的完整源码。

package com.redis; import org.junit.Test; import redis.clients.jedis.HostAndPort; import redis.clients.jedis.JedisCluster; import redis.clients.jedis.JedisPoolConfig; import redis.clients.jedis.SortingParams; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; import java.util.concurrent.TimeUnit; /** * 集群环境下Jedis操作 */ public class Cluster { private static JedisCluster jedis; static { // 添加集群的服务节点Set集合 Set<HostAndPort> hostAndPortsSet = new HashSet<HostAndPort>(); // 添加节点 hostAndPortsSet.add(new HostAndPort("192.168.56.180", 7777)); hostAndPortsSet.add(new HostAndPort("192.168.56.180", 8888)); hostAndPortsSet.add(new HostAndPort("192.168.56.181", 7777)); hostAndPortsSet.add(new HostAndPort("192.168.56.181", 8888)); hostAndPortsSet.add(new HostAndPort("192.168.56.182", 7777)); hostAndPortsSet.add(new HostAndPort("192.168.56.182", 8888)); // Jedis连接池配置 JedisPoolConfig jedisPoolConfig = new JedisPoolConfig(); // 最大空闲连接数, 默认8个 jedisPoolConfig.setMaxIdle(100); // 最大连接数, 默认8个 jedisPoolConfig.setMaxTotal(500); //最小空闲连接数, 默认0 jedisPoolConfig.setMinIdle(0); // 获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间, 默认-1 jedisPoolConfig.setMaxWaitMillis(2000); // 设置2秒 //对拿到的connection进行validateObject校验 jedisPoolConfig.setTestOnBorrow(true); jedis = new JedisCluster(hostAndPortsSet, jedisPoolConfig); } /** * 测试key:value数据 * 集群中flushDB、keys废弃 */ @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','wukong'>的键值对："+jedis.set("username", "xiaohai")); System.out.println("是否存在:"+jedis.exists("username")); System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "123456")); //Set<String> keys = jedis.keys("*"); // System.out.println("系统中所有的键如下："+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10s:"+jedis.expire("username", 10)); TimeUnit.SECONDS.sleep(2); // 线程睡眠2秒System.out.println("查看键username的剩余生存时间："+jedis.ttl("username")); 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")); } /*** * 字符串操作 * memcached和redis同样有append的操作，但是memcached有prepend的操作，redis中并没有。 * 集群中flushDB、keys、del(多个值)、mset(多个值)废弃 * @throws InterruptedException */ @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")); //命令的时候才会去连接连接，集群中连接是对一个节点连接，不能判断多个key经过crc16算法所对应的槽在一个节点上，不支持多key获取、删除 //System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02")); //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)); // 相当截取字符串的第二个位置-第四个位置的字符串 } /*** * 整数和浮点数 */ @Test public void testNumber() { 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")); System.out.println("key3的值："+jedis.get("key3")); // 这里会报错，因为key3不是整数不能做计算:redis.clients.jedis.exceptions.JedisDataException: ERR value is not an integer or out of range // System.out.println("key2的值减1："+jedis.decr("key3")); } /*** * 列表 */ @Test public void testList() { System.out.println("===========添加一个list==========="); jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap"); jedis.lpush("collections", "HashSet"); // 叠加 jedis.lpush("collections", "TreeSet"); // 叠加 jedis.lpush("collections", "TreeMap"); // 叠加 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)); // 前面4个值 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)); } /*** * set集合 */ @Test public void testSet() { 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")); // 返回0，集合中已经存在 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("e5是否在eleSet中："+jedis.sismember("eleSet", "e5")); // 集群下并存会报错：redis.clients.jedis.exceptions.JedisClusterException: No way to dispatch this command to Redis Cluster because keys have different slots. // Redis集群，从key1集合与key2集合并存、交集、差集，两个键经过crc16算法可能有不同的槽。 /*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"));*/ jedis.del("eleSet"); jedis.del("eleSet1"); jedis.del("eleSet2"); jedis.del("eleSet3"); } /*** * 散列 */ @Test public void testHash() { Map<String,String> map = new HashMap<String,String>(); 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")); } /** * 有序集合 */ @Test public void testSortedSet() { Map<String,Double> map = new HashMap<String,Double>(); map.put("key2",1.2); map.put("key3",4.0); map.put("key4",5.0); map.put("key5",0.2); // 将一个或多个 member 元素及其 score 值加入到有序集 key 当中，如果某个 member 已经是有序集的成员，那么更新这个 member 的 score 值 // score 值可以是整数值或双精度浮点数 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)); } /** * 排序 */ @Test public void testSort() { 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(); // 当数据集中保存的是字符串值时，你可以用 ALPHA,默认是升序 System.out.println("alpha排序方式：" + 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("降序："+jedis.sort("sortedList", sortingParameters.desc())); System.out.println("==============================="); // 集群下不支持分割表排序 /*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(); // 符号 "->" 用于分割哈希表的键名(key name)和索引域(hash field)，格式为 "key->field" sortingParameters.get("user:*->name"); sortingParameters.get("user:*->add"); System.out.println(jedis.sort("userlist",sortingParameters));*/ } } 重磅福利