redis 详解二
pom
<!-- Redis 官方提供的 Java 驱动 --> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency> <!-- Spring 对 Redis 的封装 --> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>1.8.6.RELEASE</version> </dependency> <!-- Java 与 JSON 的相互转换 --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.8</version> </dependency>
Redis 数据结构简介
Redis可以存储键与5种不同数据结构类型之间的映射,这5种数据结构类型分别为String(字符串)、List(列表)、Set(集合)、Hash(散列)和 Zset(有序集合)。
下面来对这5种数据结构类型作简单的介绍:
Redis 5种数据结构的概念大致介绍到这边,下面将结合Spring封装的RedisTemplate来对这5种数据结构的运用进行演示
RedisTemplate介绍
Spring封装了RedisTemplate对象来进行对Redis的各种操作,它支持所有的Redis原生的api。RedisTemplate位于spring-data-redis包下。
RedisTemplate中定义了对5种数据结构操作
redisTemplate.opsForValue();//操作字符串 redisTemplate.opsForHash();//操作hash redisTemplate.opsForList();//操作list redisTemplate.opsForSet();//操作set redisTemplate.opsForZSet();//操作有序set
StringRedisTemplate与RedisTemplate
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两者的关系是StringRedisTemplate继承RedisTemplate。
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两者的数据是不共通的;也就是说StringRedisTemplate只能管理StringRedisTemplate里面的数据,RedisTemplate只能管理RedisTemplate中的数据。
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SDR默认采用的序列化策略有两种,一种是String的序列化策略,一种是JDK的序列化策略。
StringRedisTemplate默认采用的是String的序列化策略,保存的key和value都是采用此策略序列化保存的。
RedisTemplate默认采用的是JDK的序列化策略,保存的key和value都是采用此策略序列化保存的。
RedisConf配置如下:
package com.guige.core.conf; import com.guige.core.ext.common.redis.MyCacheErrorHandler; import com.guige.core.ext.common.redis.MyKeyGenerator; import com.guige.core.ext.common.redis.MyRedisCacheManager; import com.guige.core.ext.common.redis.MyRedisTemplate; import org.springframework.beans.factory.annotation.Value; import org.springframework.cache.interceptor.CacheErrorHandler; import org.springframework.cache.interceptor.KeyGenerator; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.connection.jedis.JedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import redis.clients.jedis.JedisPoolConfig; /** * TODO * * @author songaw * @date 2018/7/17 11:29 */ @Component @Configuration public class RedisConf { @Value("${spring.redis.database}") private Integer database; @Value("${spring.redis.host}") private String host; @Value("${spring.redis.password}") private String password; @Value("${spring.redis.port}") private Integer port; @Value("${spring.redis.timeout}") private Integer timeout; @Value(value = "${spring.redis.expire:300}") private Integer expiration; @Value("${spring.redis.pool.maxactive}") private int maxActive; @Value("${spring.redis.pool.minidle}") private int minIdle; @Value("${spring.redis.pool.maxidle}") private int maxIdle; @Bean public JedisPoolConfig jedisPoolConfig(){ JedisPoolConfig poolConfig = new JedisPoolConfig(); poolConfig.setMaxIdle(this.maxIdle); poolConfig.setMinIdle(this.minIdle); poolConfig.setTestOnCreate(true); poolConfig.setTestOnBorrow(true); poolConfig.setTestOnReturn(true); poolConfig.setTestWhileIdle(true); return poolConfig; } @Bean public JedisConnectionFactory jedisConnectionFactory(){ JedisPoolConfig config = jedisPoolConfig(); JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory(config); jedisConnectionFactory.setDatabase(this.database); jedisConnectionFactory.setHostName(this.host); jedisConnectionFactory.setPassword(this.password); jedisConnectionFactory.setPort(this.port); jedisConnectionFactory.setTimeout(this.timeout); return jedisConnectionFactory; } @Bean public RedisTemplate redisTemplate(){ MyRedisTemplate myRedisTemplate = new MyRedisTemplate(); myRedisTemplate.setConnectionFactory(jedisConnectionFactory()); return myRedisTemplate; } public RedisCacheManager redisCacheManager(){ MyRedisCacheManager myRedisCacheManager = new MyRedisCacheManager(redisTemplate()); return myRedisCacheManager; } @Bean public CacheErrorHandler cacheErrorHandler(){ MyCacheErrorHandler myCacheErrorHandler = new MyCacheErrorHandler(); return myCacheErrorHandler; } @Bean KeyGenerator keyGenerator(){ MyKeyGenerator myKeyGenerator = new MyKeyGenerator(); return myKeyGenerator; } }
Redis的String数据结构 (推荐使用StringRedisTemplate)
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public interface ValueOperations<K,V> ValueOperations可以对String数据结构进行操作: --------------------------------------------------------------------------------------------------------------- set void set(K key, V value); 使用:redisTemplate.opsForValue().set("name","tom"); 结果:redisTemplate.opsForValue().get("name") 输出结果为tom --------------------------------------------------------------------------------------------------------------- set void set(K key, V value, long timeout, TimeUnit unit); 使用:redisTemplate.opsForValue().set("name","tom",10, TimeUnit.SECONDS); 结果:redisTemplate.opsForValue().get("name")由于设置的是10秒失效,十秒之内查询有结果,十秒之后返回为null --------------------------------------------------------------------------------------------------------------- set void set(K key, V value, long offset); 该方法是用 value 参数覆写(overwrite)给定 key 所储存的字符串值,从偏移量 offset 开始 使用:template.opsForValue().set("key","hello world"); template.opsForValue().set("key","redis", 6); System.out.println("***************"+template.opsForValue().get("key")); 结果:***************hello redis --------------------------------------------------------------------------------------------------------------- setIfAbsent Boolean setIfAbsent(K key, V value); 使用:System.out.println(template.opsForValue().setIfAbsent("multi1","multi1"));//false multi1之前已经存在 System.out.println(template.opsForValue().setIfAbsent("multi111","multi111"));//true multi111之前不存在 结果:false true --------------------------------------------------------------------------------------------------------------- multiSet void multiSet(Map<? extends K, ? extends V> m); 为多个键分别设置它们的值 multiSet void multiSet(Map<? extends K, ? extends V> m); 使用: Map<String,String> maps = new HashMap<String, String>(); maps.put("multi1","multi1"); maps.put("multi2","multi2"); maps.put("multi3","multi3"); template.opsForValue().multiSet(maps); List<String> keys = new ArrayList<String>(); keys.add("multi1"); keys.add("multi2"); keys.add("multi3"); System.out.println(template.opsForValue().multiGet(keys)); 结果: [multi1, multi2, multi3] --------------------------------------------------------------------------------------------------------------- get V get(Object key); 使用:template.opsForValue().set("key","hello world"); System.out.println("***************"+template.opsForValue().get("key")); 结果:***************hello world --------------------------------------------------------------------------------------------------------------- getAndSet V getAndSet(K key, V value); 设置键的字符串值并返回其旧值 使用:template.opsForValue().set("getSetTest","test"); System.out.println(template.opsForValue().getAndSet("getSetTest","test2")); 结果:test --------------------------------------------------------------------------------------------------------------- multiGet List<V> multiGet(Collection<K> keys); 为多个键分别取出它们的值 使用:Map<String,String> maps = new HashMap<String, String>(); maps.put("multi1","multi1"); maps.put("multi2","multi2"); maps.put("multi3","multi3"); template.opsForValue().multiSet(maps); List<String> keys = new ArrayList<String>(); keys.add("multi1"); keys.add("multi2"); keys.add("multi3"); System.out.println(template.opsForValue().multiGet(keys)); 结果:[multi1, multi2, multi3] --------------------------------------------------------------------------------------------------------------- increment Long increment(K key, long delta); 支持整数 使用:template.opsForValue().increment("increlong",1); System.out.println("***************"+template.opsForValue().get("increlong")); 结果:***************1 --------------------------------------------------------------------------------------------------------------- increment Double increment(K key, double delta); 也支持浮点数 使用:template.opsForValue().increment("increlong",1.2); System.out.println("***************"+template.opsForValue().get("increlong")); 结果:***************2.2 --------------------------------------------------------------------------------------------------------------- append Integer append(K key, String value); 如果key已经存在并且是一个字符串,则该命令将该值追加到字符串的末尾。如果键不存在,则它被创建并设置为空字符串,因此APPEND在这种特殊情况下将类似于SET。 使用:template.opsForValue().append("appendTest","Hello"); System.out.println(template.opsForValue().get("appendTest")); template.opsForValue().append("appendTest","world"); System.out.println(template.opsForValue().get("appendTest")); 结果:Hello Helloworld --------------------------------------------------------------------------------------------------------------- get String get(K key, long start, long end); 截取key所对应的value字符串 使用:appendTest对应的value为Helloworld System.out.println("*********"+template.opsForValue().get("appendTest",0,5)); 结果:*********Hellow 使用:System.out.println("*********"+template.opsForValue().get("appendTest",0,-1)); 结果:*********Helloworld 使用:System.out.println("*********"+template.opsForValue().get("appendTest",-3,-1)); 结果:*********rld --------------------------------------------------------------------------------------------------------------- size Long size(K key); 返回key所对应的value值得长度 使用:template.opsForValue().set("key","hello world"); System.out.println("***************"+template.opsForValue().size("key")); 结果:***************11 --------------------------------------------------------------------------------------------------------------- setBit Boolean setBit(K key, long offset, boolean value); 对 key 所储存的字符串值,设置或清除指定偏移量上的位(bit) key键对应的值value对应的ascii码,在offset的位置(从左向右数)变为value 使用:template.opsForValue().set("bitTest","a"); // 'a' 的ASCII码是 97。转换为二进制是:01100001 // 'b' 的ASCII码是 98 转换为二进制是:01100010 // 'c' 的ASCII码是 99 转换为二进制是:01100011 //因为二进制只有0和1,在setbit中true为1,false为0,因此我要变为'b'的话第六位设置为1,第七位设置为0 template.opsForValue().setBit("bitTest",6, true); template.opsForValue().setBit("bitTest",7, false); System.out.println(template.opsForValue().get("bitTest")); 结果:b --------------------------------------------------------------------------------------------------------------- getBit Boolean getBit(K key, long offset); 获取键对应值的ascii码的在offset处位值 使用:System.out.println(template.opsForValue().getBit("bitTest",7)); 结果:false
Redis的List数据结构
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public interface ListOperations<K,V> Redis列表是简单的字符串列表,按照插入顺序排序。你可以添加一个元素导列表的头部(左边)或者尾部(右边) ListOperations专门操作list列表: --------------------------------------------------------------------------------------------------------------- List<V> range(K key, long start, long end); 返回存储在键中的列表的指定元素。偏移开始和停止是基于零的索引,其中0是列表的第一个元素(列表的头部),1是下一个元素 使用:System.out.println(template.opsForList().range("list",0,-1)); 结果:[c#, c++, python, java, c#, c#] --------------------------------------------------------------------------------------------------------------- void trim(K key, long start, long end); 修剪现有列表,使其只包含指定的指定范围的元素,起始和停止都是基于0的索引 使用: System.out.println(template.opsForList().range("list",0,-1)); template.opsForList().trim("list",1,-1);//裁剪第一个元素 System.out.println(template.opsForList().range("list",0,-1)); 结果:[c#, c++, python, java, c#, c#] [c++, python, java, c#, c#] --------------------------------------------------------------------------------------------------------------- Long size(K key); 返回存储在键中的列表的长度。如果键不存在,则将其解释为空列表,并返回0。当key存储的值不是列表时返回错误。 使用:System.out.println(template.opsForList().size("list")); 结果:6 --------------------------------------------------------------------------------------------------------------- Long leftPush(K key, V value); 将所有指定的值插入存储在键的列表的头部。如果键不存在,则在执行推送操作之前将其创建为空列表。(从左边插入) 使用:template.opsForList().leftPush("list","java"); template.opsForList().leftPush("list","python"); template.opsForList().leftPush("list","c++"); 结果:返回的结果为推送操作后的列表的长度 1 2 3 --------------------------------------------------------------------------------------------------------------- Long leftPushAll(K key, V... values); 批量把一个数组插入到列表中 使用:String[] stringarrays = new String[]{"1","2","3"}; template.opsForList().leftPushAll("listarray",stringarrays); System.out.println(template.opsForList().range("listarray",0,-1)); 结果:[3, 2, 1] --------------------------------------------------------------------------------------------------------------- Long leftPushAll(K key, Collection<V> values); 批量把一个集合插入到列表中 使用:List<Object> strings = new ArrayList<Object>(); strings.add("1"); strings.add("2"); strings.add("3"); template.opsForList().leftPushAll("listcollection4", strings); System.out.println(template.opsForList().range("listcollection4",0,-1)); 结果:[3, 2, 1] --------------------------------------------------------------------------------------------------------------- Long leftPushIfPresent(K key, V value); 只有存在key对应的列表才能将这个value值插入到key所对应的列表中 使用:System.out.println(template.opsForList().leftPushIfPresent("leftPushIfPresent","aa")); System.out.println(template.opsForList().leftPushIfPresent("leftPushIfPresent","bb")); ==========分割线=========== System.out.println(template.opsForList().leftPush("leftPushIfPresent","aa")); System.out.println(template.opsForList().leftPushIfPresent("leftPushIfPresent","bb")); 结果: 0 0 ==========分割线=========== 1 2 --------------------------------------------------------------------------------------------------------------- Long leftPush(K key, V pivot, V value); 把value值放到key对应列表中pivot值的左面,如果pivot值存在的话 使用:template.opsForList().leftPush("list","java","oc"); System.out.print(template.opsForList().range("list",0,-1)); 结果:[c++, python, oc, java, c#, c#] --------------------------------------------------------------------------------------------------------------- Long rightPush(K key, V value); 将所有指定的值插入存储在键的列表的头部。如果键不存在,则在执行推送操作之前将其创建为空列表。(从右边插入) 使用:template.opsForList().rightPush("listRight","java"); template.opsForList().rightPush("listRight","python"); template.opsForList().rightPush("listRight","c++"); 结果: 1 2 3 --------------------------------------------------------------------------------------------------------------- Long rightPushAll(K key, V... values); 使用:String[] stringarrays = new String[]{"1","2","3"}; template.opsForList().rightPushAll("listarrayright",stringarrays); System.out.println(template.opsForList().range("listarrayright",0,-1)); 结果:[1, 2, 3] --------------------------------------------------------------------------------------------------------------- Long rightPushAll(K key, Collection<V> values); 使用:List<Object> strings = new ArrayList<Object>(); strings.add("1"); strings.add("2"); strings.add("3"); template.opsForList().rightPushAll("listcollectionright", strings); System.out.println(template.opsForList().range("listcollectionright",0,-1)); 结果:[1, 2, 3] --------------------------------------------------------------------------------------------------------------- Long rightPushIfPresent(K key, V value); 只有存在key对应的列表才能将这个value值插入到key所对应的列表中 使用:System.out.println(template.opsForList().rightPushIfPresent("rightPushIfPresent","aa")); System.out.println(template.opsForList().rightPushIfPresent("rightPushIfPresent","bb")); System.out.println("==========分割线==========="); System.out.println(template.opsForList().rightPush("rightPushIfPresent","aa")); System.out.println(template.opsForList().rightPushIfPresent("rightPushIfPresent","bb")); 结果:0 0 ==========分割线=========== 1 2 --------------------------------------------------------------------------------------------------------------- Long rightPush(K key, V pivot, V value); 把value值放到key对应列表中pivot值的右面,如果pivot值存在的话 使用:System.out.println(template.opsForList().range("listRight",0,-1)); template.opsForList().rightPush("listRight","python","oc"); System.out.println(template.opsForList().range("listRight",0,-1)); 结果:[java, python, c++] [java, python, oc, c++] --------------------------------------------------------------------------------------------------------------- void set(K key, long index, V value); 在列表中index的位置设置value值 使用:System.out.println(template.opsForList().range("listRight",0,-1)); template.opsForList().set("listRight",1,"setValue"); System.out.println(template.opsForList().range("listRight",0,-1)); 结果:[java, python, oc, c++] [java, setValue, oc, c++] --------------------------------------------------------------------------------------------------------------- Long remove(K key, long count, Object value); 从存储在键中的列表中删除等于值的元素的第一个计数事件。 计数参数以下列方式影响操作: count> 0:删除等于从头到尾移动的值的元素。 count <0:删除等于从尾到头移动的值的元素。 count = 0:删除等于value的所有元素。 使用:System.out.println(template.opsForList().range("listRight",0,-1)); template.opsForList().remove("listRight",1,"setValue");//将删除列表中存储的列表中第一次次出现的“setValue”。 System.out.println(template.opsForList().range("listRight",0,-1)); 结果:[java, setValue, oc, c++] [java, oc, c++] --------------------------------------------------------------------------------------------------------------- V index(K key, long index); 根据下表获取列表中的值,下标是从0开始的 使用:System.out.println(template.opsForList().range("listRight",0,-1)); System.out.println(template.opsForList().index("listRight",2)); 结果:[java, oc, c++] c++ --------------------------------------------------------------------------------------------------------------- V leftPop(K key); 弹出最左边的元素,弹出之后该值在列表中将不复存在 使用:System.out.println(template.opsForList().range("list",0,-1)); System.out.println(template.opsForList().leftPop("list")); System.out.println(template.opsForList().range("list",0,-1)); 结果: [c++, python, oc, java, c#, c#] c++ [python, oc, java, c#, c#] --------------------------------------------------------------------------------------------------------------- V leftPop(K key, long timeout, TimeUnit unit); 移出并获取列表的第一个元素, 如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。 使用:用法与 leftPop(K key);一样 --------------------------------------------------------------------------------------------------------------- V rightPop(K key); 弹出最右边的元素,弹出之后该值在列表中将不复存在 使用: System.out.println(template.opsForList().range("list",0,-1)); System.out.println(template.opsForList().rightPop("list")); System.out.println(template.opsForList().range("list",0,-1)); 结果:[python, oc, java, c#, c#] c# [python, oc, java, c#] --------------------------------------------------------------------------------------------------------------- V rightPop(K key, long timeout, TimeUnit unit); 移出并获取列表的最后一个元素, 如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。 使用:用法与 rightPop(K key);一样 --------------------------------------------------------------------------------------------------------------- V rightPopAndLeftPush(K sourceKey, K destinationKey); 用于移除列表的最后一个元素,并将该元素添加到另一个列表并返回。 使用:System.out.println(template.opsForList().range("list",0,-1)); template.opsForList().rightPopAndLeftPush("list","rightPopAndLeftPush"); System.out.println(template.opsForList().range("list",0,-1)); System.out.println(template.opsForList().range("rightPopAndLeftPush",0,-1)); 结果:[oc, java,c#] [oc, java] [c#] --------------------------------------------------------------------------------------------------------------- V rightPopAndLeftPush(K sourceKey, K destinationKey, long timeout, TimeUnit unit); 用于移除列表的最后一个元素,并将该元素添加到另一个列表并返回,如果列表没有元素会阻塞列表直到等待超时或发现可弹出元素为止。 使用:用法与rightPopAndLeftPush(K sourceKey, K destinationKey)一样
Redis的Hash数据机构(Redis的散列可以让用户将多个键值对存储到一个Redis键里面)
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public interface HashOperations<H,HK,HV> HashOperations提供一系列方法操作hash: --------------------------------------------------------------------------------------------------------------- 初始数据: template.opsForHash().put("redisHash","name","tom"); template.opsForHash().put("redisHash","age",26); template.opsForHash().put("redisHash","class","6"); Map<String,Object> testMap = new HashMap(); testMap.put("name","jack"); testMap.put("age",27); testMap.put("class","1"); template.opsForHash().putAll("redisHash1",testMap); --------------------------------------------------------------------------------------------------------------- Long delete(H key, Object... hashKeys); 删除给定的哈希hashKeys 使用:System.out.println(template.opsForHash().delete("redisHash","name")); System.out.println(template.opsForHash().entries("redisHash")); 结果:1 {class=6, age=28.1} --------------------------------------------------------------------------------------------------------------- Boolean hasKey(H key, Object hashKey); 确定哈希hashKey是否存在 使用:System.out.println(template.opsForHash().hasKey("redisHash","age")); System.out.println(template.opsForHash().hasKey("redisHash","ttt")); 结果:true false --------------------------------------------------------------------------------------------------------------- HV get(H key, Object hashKey); 从键中的哈希获取给定hashKey的值 使用:System.out.println(template.opsForHash().get("redisHash","age")); 结果:26 --------------------------------------------------------------------------------------------------------------- List<HV> multiGet(H key, Collection<HK> hashKeys); 从哈希中获取给定hashKey的值 使用:List<Object> kes = new ArrayList<Object>(); kes.add("name"); kes.add("age"); System.out.println(template.opsForHash().multiGet("redisHash",kes)); 结果:[jack, 28.1] --------------------------------------------------------------------------------------------------------------- Long increment(H key, HK hashKey, long delta); 通过给定的delta增加散列hashKey的值(整型) 使用:System.out.println(template.opsForHash().get("redisHash","age")); System.out.println(template.opsForHash().increment("redisHash","age",1)); 结果:26 27 --------------------------------------------------------------------------------------------------------------- Double increment(H key, HK hashKey, double delta); 通过给定的delta增加散列hashKey的值(浮点数) 使用:System.out.println(template.opsForHash().get("redisHash","age")); System.out.println(template.opsForHash().increment("redisHash","age",1.1)); 结果:27 28.1 --------------------------------------------------------------------------------------------------------------- Set<HK> keys(H key); 获取key所对应的散列表的key 使用:System.out.println(template.opsForHash().keys("redisHash1")); //redisHash1所对应的散列表为{class=1, name=jack, age=27} 结果:[name, class, age] --------------------------------------------------------------------------------------------------------------- Long size(H key); 获取key所对应的散列表的大小个数 使用:System.out.println(template.opsForHash().size("redisHash1")); //redisHash1所对应的散列表为{class=1, name=jack, age=27} 结果:3 --------------------------------------------------------------------------------------------------------------- void putAll(H key, Map<? extends HK, ? extends HV> m); 使用m中提供的多个散列字段设置到key对应的散列表中 使用:Map<String,Object> testMap = new HashMap(); testMap.put("name","jack"); testMap.put("age",27); testMap.put("class","1"); template.opsForHash().putAll("redisHash1",testMap); System.out.println(template.opsForHash().entries("redisHash1")); 结果:{class=1, name=jack, age=27} --------------------------------------------------------------------------------------------------------------- void put(H key, HK hashKey, HV value); 设置散列hashKey的值 使用:template.opsForHash().put("redisHash","name","tom"); template.opsForHash().put("redisHash","age",26); template.opsForHash().put("redisHash","class","6"); System.out.println(template.opsForHash().entries("redisHash")); 结果:{age=26, class="6", name=tom} --------------------------------------------------------------------------------------------------------------- Boolean putIfAbsent(H key, HK hashKey, HV value); 仅当hashKey不存在时才设置散列hashKey的值。 使用:System.out.println(template.opsForHash().putIfAbsent("redisHash","age",30)); System.out.println(template.opsForHash().putIfAbsent("redisHash","kkk","kkk")); 结果:false true --------------------------------------------------------------------------------------------------------------- List<HV> values(H key); 获取整个哈希存储的值根据密钥 使用:System.out.println(template.opsForHash().values("redisHash")); 结果:[tom, 26, 6] --------------------------------------------------------------------------------------------------------------- Map<HK, HV> entries(H key); 获取整个哈希存储根据密钥 使用:System.out.println(template.opsForHash().entries("redisHash")); 结果:{age=26, class="6", name=tom} --------------------------------------------------------------------------------------------------------------- Cursor<Map.Entry<HK, HV>> scan(H key, ScanOptions options); 使用Cursor在key的hash中迭代,相当于迭代器。 使用:Cursor<Map.Entry<Object, Object>> curosr = template.opsForHash().scan("redisHash", ScanOptions.ScanOptions.NONE); while(curosr.hasNext()){ Map.Entry<Object, Object> entry = curosr.next(); System.out.println(entry.getKey()+":"+entry.getValue()); } 结果:age:28.1 class:6 kkk:kkk
Redis的Set数据结构
Redis的Set是string类型的无序集合。集合成员是唯一的,这就意味着集合中不能出现重复的数据。
Redis 中 集合是通过哈希表实现的,所以添加,删除,查找的复杂度都是O(1)。
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public interface SetOperations<K,V> SetOperations提供了对无序集合的一系列操作: ---------------------------------------------------------------------------------------------------------------Long add(K key, V... values);无序集合中添加元素,返回添加个数也可以直接在add里面添加多个值 如:template.opsForSet().add("setTest","aaa","bbb") 使用:String[] strarrays = new String[]{"strarr1","sgtarr2"}; System.out.println(template.opsForSet().add("setTest", strarrays)); 结果:2 ---------------------------------------------------------------------------------------------------------------Long remove(K key, Object... values);移除集合中一个或多个成员 使用:String[] strarrays = new String[]{"strarr1","sgtarr2"}; System.out.println(template.opsForSet().remove("setTest",strarrays)); 结果:2 ---------------------------------------------------------------------------------------------------------------V pop(K key);移除并返回集合中的一个随机元素 使用:System.out.println(template.opsForSet().pop("setTest")); System.out.println(template.opsForSet().members("setTest")); 结果:bbb [aaa, ccc] --------------------------------------------------------------------------------------------------------------- Boolean move(K key, V value, K destKey);将 member 元素从 source 集合移动到 destination 集合 使用:template.opsForSet().move("setTest","aaa","setTest2"); System.out.println(template.opsForSet().members("setTest")); System.out.println(template.opsForSet().members("setTest2")); 结果:[ccc] [aaa] ---------------------------------------------------------------------------------------------------------------Long size(K key);无序集合的大小长度 使用:System.out.println(template.opsForSet().size("setTest")); 结果:1 ---------------------------------------------------------------------------------------------------------------Boolean isMember(K key, Object o);判断 member 元素是否是集合 key 的成员 使用:System.out.println(template.opsForSet().isMember("setTest","ccc")); System.out.println(template.opsForSet().isMember("setTest","asd")); 结果:true false---------------------------------------------------------------------------------------------------------------Set<V> intersect(K key, K otherKey); key对应的无序集合与otherKey对应的无序集合求交集 使用:System.out.println(template.opsForSet().members("setTest")); System.out.println(template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().intersect("setTest","setTest2")); 结果:[aaa, ccc] [aaa] [aaa] --------------------------------------------------------------------------------------------------------------- Set<V> intersect(K key, Collection<K> otherKeys);key对应的无序集合与多个otherKey对应的无序集合求交集 使用:System.out.println(template.opsForSet().members("setTest")); System.out.println(template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().members("setTest3")); List<String> strlist = new ArrayList<String>(); strlist.add("setTest2"); strlist.add("setTest3"); System.out.println(template.opsForSet().intersect("setTest",strlist)); 结果:[aaa, ccc] [aaa] [ccc, aaa] [aaa] ---------------------------------------------------------------------------------------------------------------Long intersectAndStore(K key, K otherKey, K destKey);key无序集合与otherkey无序集合的交集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().intersectAndStore("setTest","setTest2","destKey1")); System.out.println(template.opsForSet().members("destKey1")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] 2 [aaa, ccc]---------------------------------------------------------------------------------------------------------------Long intersectAndStore(K key, Collection<K> otherKeys, K destKey);key对应的无序集合与多个otherKey对应的无序集合求交集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println("setTest3:" + template.opsForSet().members("setTest3")); List<String> strlist = new ArrayList<String>(); strlist.add("setTest2"); strlist.add("setTest3"); System.out.println(template.opsForSet().intersectAndStore("setTest",strlist,"destKey2")); System.out.println(template.opsForSet().members("destKey2")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] setTest3:[ccc, aaa] 2 [aaa, ccc] ---------------------------------------------------------------------------------------------------------------Long unionAndStore(K key, K otherKey, K destKey);key无序集合与otherkey无序集合的并集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().unionAndStore("setTest","setTest2","unionAndStoreTest1")); System.out.println("unionAndStoreTest1:" + template.opsForSet().members("unionAndStoreTest1")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] 4 unionAndStoreTest1:[ccc, aaa, ddd, bbb] ---------------------------------------------------------------------------------------------------------------Long unionAndStore(K key, Collection<K> otherKeys, K destKey);key无序集合与多个otherkey无序集合的并集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println("setTest3:" + template.opsForSet().members("setTest3")); List<String> strlist = new ArrayList<String>(); strlist.add("setTest2"); strlist.add("setTest3"); System.out.println(template.opsForSet().unionAndStore("setTest",strlist,"unionAndStoreTest2")); System.out.println("unionAndStoreTest2:" + template.opsForSet().members("unionAndStoreTest2")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] setTest3:[xxx, ccc, aaa] 5 unionAndStoreTest2:[ddd, xxx, bbb, aaa, ccc] ---------------------------------------------------------------------------------------------------------------Set<V> difference(K key, K otherKey);key无序集合与otherKey无序集合的差集 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().difference("setTest","setTest2")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] [bbb, ddd] ---------------------------------------------------------------------------------------------------------------Set<V> difference(K key, Collection<K> otherKeys);key无序集合与多个otherKey无序集合的差集 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println("setTest3:" + template.opsForSet().members("setTest3")); List<String> strlist = new ArrayList<String>(); strlist.add("setTest2"); strlist.add("setTest3"); System.out.println(template.opsForSet().difference("setTest",strlist)); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] setTest3:[xxx, ccc, aaa] [bbb, ddd] ---------------------------------------------------------------------------------------------------------------Long differenceAndStore(K key, K otherKey, K destKey);key无序集合与otherkey无序集合的差集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println(template.opsForSet().differenceAndStore("setTest","setTest2","differenceAndStore1")); System.out.println("differenceAndStore1:" + template.opsForSet().members("differenceAndStore1")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] 2 differenceAndStore1:[bbb, ddd] ---------------------------------------------------------------------------------------------------------------Long differenceAndStore(K key, Collection<K> otherKeys, K destKey);key无序集合与多个otherkey无序集合的差集存储到destKey无序集合中 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTest2:" + template.opsForSet().members("setTest2")); System.out.println("setTest3:" + template.opsForSet().members("setTest3")); List<String> strlist = new ArrayList<String>(); strlist.add("setTest2"); strlist.add("setTest3"); System.out.println(template.opsForSet().differenceAndStore("setTest",strlist,"differenceAndStore2")); System.out.println("differenceAndStore2:" + template.opsForSet().members("differenceAndStore2")); 结果:setTest:[ddd, bbb, aaa, ccc] setTest2:[ccc, aaa] setTest3:[xxx, ccc, aaa] 2 differenceAndStore2:[bbb, ddd] ---------------------------------------------------------------------------------------------------------------Set<V> members(K key); 返回集合中的所有成员 使用:System.out.println(template.opsForSet().members("setTest")); 结果:[ddd, bbb, aaa, ccc] ---------------------------------------------------------------------------------------------------------------V randomMember(K key);随机获取key无序集合中的一个元素 使用:System.out.println("setTest:" + template.opsForSet().members("setTest")); System.out.println("setTestrandomMember:" + template.opsForSet().randomMember("setTest")); System.out.println("setTestrandomMember:" + template.opsForSet().randomMember("setTest")); System.out.println("setTestrandomMember:" + template.opsForSet().randomMember("setTest")); System.out.println("setTestrandomMember:" + template.opsForSet().randomMember("setTest")); 结果:setTest:[ddd, bbb, aaa, ccc] setTestrandomMember:aaa setTestrandomMember:bbb setTestrandomMember:aaa setTestrandomMember:ddd ---------------------------------------------------------------------------------------------------------------Set<V> distinctRandomMembers(K key, long count); 获取多个key无序集合中的元素(去重),count表示个数 使用:System.out.println("randomMembers:" + template.opsForSet().distinctRandomMembers("setTest",5)); 结果:randomMembers:[aaa, bbb, ddd, ccc] --------------------------------------------------------------------------------------------------------------- List<V> randomMembers(K key, long count);获取多个key无序集合中的元素,count表示个数 使用:System.out.println("randomMembers:" + template.opsForSet().randomMembers("setTest",5)); 结果:randomMembers:[ccc, ddd, ddd, ddd, aaa] --------------------------------------------------------------------------------------------------------------- Cursor<V> scan(K key, ScanOptions options);遍历set 使用: Cursor<Object> curosr = template.opsForSet().scan("setTest", ScanOptions.NONE); while(curosr.hasNext()){ System.out.println(curosr.next()); } 结果:ddd bbb aaa ccc
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