发布时间：2020/08/31
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| var article_content = "<p>上文（<a href="http://www.imooc.com/article/16523）介绍了Redis概念，以及数据类型，安装等，此文将会介绍Java操作redis数据库的数据类型的一些实例" target="_blank" rel="nofollow">http://www.imooc.com/article/16523）介绍了Redis概念，以及数据类型，安装等，此文将会介绍Java操作redis数据库的数据类型的一些实例</a>。<br />\nRedis支持五种数据类型：string（字符串），hash（哈希），list（列表），set（集合）及zset(sorted set：有序集合)。<br />\n下面将会给出实例：<br />\n1.Java操作Redis键（key）</p>\n<pre class="prettyprint"><code>package com.redis1;\n\nimport java.util.List;\n\nimport redis.clients.jedis.Jedis;\n\n/**\n * Redis keys实例\n * @author dell\n *\n */\npublic class RedisKeys {\n public static void main(String[] args) {\n //连接redis本地服务\n Jedis jedis = new Jedis("127.0.0.1");\n System.out.println("redis本地服务连接成功！");\n /*Redis Bgsave 命令用于在后台异步保存当前数据库的数据到磁盘。\n BGSAVE 命令执行之后立即返回 OK ，然后 Redis fork 出一个新子进程，\n 原来的 Redis 进程(父进程)继续处理客户端请求，而子进程则负责将数据保存到磁盘，然后退出。\n */\n System.out.println(jedis.bgsave());\n //Redis Echo 命令用于打印给定的字符串。\n System.out.println(jedis.echo("redis"));\n //Redis Flushall 命令用于清空整个 Redis 服务器的数据(删除所有数据库的所有 key )。\n System.out.println(jedis.flushAll());\n //Redis Flushdb 命令用于清空当前数据库中的所有 key。\n System.out.println(jedis.flushDB());\n /*\n Redis Ping 命令使用客户端向 Redis 服务器发送一个 PING ，如果服务器运作正常的话，会返回一个 PONG 。\n 通常用于测试与服务器的连接是否仍然生效，或者用于测量延迟值。\n */\n System.out.println(jedis.ping());\n //Redis Info 命令以一种易于理解和阅读的格式，返回关于 Redis 服务器的各种信息和统计数值。\n System.out.println("\\ninfo-----&gt;"+jedis.info());\n //Redis RANDOMKEY 命令从当前数据库中随机返回一个 key 。\n System.out.println(jedis.randomKey());\n //Redis Save 命令执行一个同步保存操作，将当前 Redis 实例的所有数据快照(snapshot)以 RDB 文件的形式保存到硬盘。\n System.out.println(jedis.save());\n //Redis Unwatch 命令用于取消 WATCH 命令对所有 key 的监视。\n System.out.println(jedis.unwatch());\n /*\n Redis Multi 命令用于标记一个事务块的开始。\n 事务块内的多条命令会按照先后顺序被放进一个队列当中，最后由 EXEC 命令原子性(atomic)地执行。\n */\n\n System.out.println(jedis.multi());\n /*Redis Quit 命令用于关闭与当前客户端与redis服务的连接。\n 一旦所有等待中的回复(如果有的话)顺利写入到客户端，连接就会被关闭。*/\n System.out.println(jedis.quit());\n }\n\n}</code></pre>\n<p>2.Java操作Redis列表（list）</p>\n<pre class="prettyprint"><code>package com.redis1;\n\nimport java.util.List;\n\nimport redis.clients.jedis.BinaryClient;\nimport redis.clients.jedis.Jedis;\n\n/**\n * redis list数据类型\n * \n * @author dell\n *\n */\npublic class RedisList {\n\n public static void main(String[] args) {\n // 连接本地的 Redis 服务\n Jedis jedis = new Jedis("localhost");\n System.out.println("redis本地服务连接成功！");\n /*\n * lpush 表示从list的头部插入元素 rpush 表示从list的尾部插入元素 linsert 在列表的某个元素前或者后插入元素\n * index 表示列表中index位置的元素 llen 返回列表的长度 lpop list 0 -1\n * 表示从mylist列表的头部开始删除所有元素 rpop list 0 -1 表示从mylist列表的尾部开始删除所有元素 lrange\n * list 0 -1 //使用lrange取出元素 0表示从头部第一个元素，-1表示从尾部第一个元素取出，lrange mylist 0\n * -1 表示取出mylist中的所有数据\n */\n // 存储数据到列表中\n jedis.lpush("SQL", "Redis");\n jedis.lpush("SQL", "Mongodb");\n jedis.lpush("SQL", "Mysql");\n jedis.linsert("SQL", BinaryClient.LIST_POSITION.BEFORE, "MySql", "java");\n jedis.rpush("SQL", "SqlServer");\n jedis.rpush("SQL", "Oracle");\n\n jedis.linsert("SQL", BinaryClient.LIST_POSITION.BEFORE, "MySql", "java");\n // Redis Lpushx 将一个或多个值插入到已存在的列表头部，列表不存在时操作无效。\n System.out.println(jedis.lpushx("SQL", "Redis1"));\n // 获取存储的数据并输出\n List&lt;String&gt; list = jedis.lrange("SQL", 0, -1);\n for (int i = 0; i &lt; list.size(); i++) {\n System.out.println("Stored string in redis:: " + list.get(i));\n }\n\n // 获得列表的长度\n System.out.println("redis列表长度为：" + jedis.llen("SQL"));\n // 删除列表中的元素\n jedis.del("SQL");\n System.out.println("删除了redis列表！");\n // 获得列表的长度\n System.out.println("redis列表长度为：" + jedis.llen("SQL"));\n // 列表下标从0开始\n System.out.println("redis列表下标为5的元素是：" + jedis.lindex("SQL", 5));\n /*\n * Redis Ltrim 对一个列表进行修剪(trim)，就是说，让列表只保留指定区间内的元素，不在指定区间之内的元素都将被删除。 下标 0\n * 表示列表的第一个元素，以 1 表示列表的第二个元素，以此类推。 你也可以使用负数下标，以 -1 表示列表的最后一个元素， -2\n * 表示列表的倒数第二个元素，以此类推。\n */\n System.out.println(jedis.ltrim("SQL", 0, 4));\n\n }\n\n}</code></pre>\n<p>3.Java操作Redis集合（set）</p>\n<pre class="prettyprint"><code>package com.redis1;\n\nimport java.util.Set;\n\nimport redis.clients.jedis.Jedis;\n\n/**\n * Redis set数据类型\n * @author dell\n *\n */\npublic class RedisSet {\n\n public static void main(String[] args) {\n Jedis jedis = new Jedis("127.0.0.1",6379);\n\n //set方法用于向redis数据库中添加设置数据\n jedis.set("k1", "v1");\n jedis.set("k2", "v2");\n jedis.set("k3", "v3");\n //get方法用于获取某个键所对应的值\n System.out.println(jedis.get("k3"));\n //del方法用于删除某个键所对应的值\n System.out.println(jedis.del("k1"));\n //getSet方法用户获取某个键所对应的值，键不存在，返回null；键存在，返回对应的值\n System.out.println(jedis.getSet("k4", "v4"));\n /*getrange(key, startOffset, endOffset)方法用于获取存在在key中字符串的子字符串\n 字符串的截取范围由start和end两个偏移量决定\n */\n System.out.println(jedis.getrange("k2", 1, -1));\n //lpop方法用于移除并返回列表的第一个元素\n System.out.println(jedis.lpop("k1"));\n //rpop方法用于移除并返回列表的最后一个元素\n System.out.println(jedis.rpop("k5"));\n //返回集合的长度\n Set&lt;String&gt; sets = jedis.keys("*");\n System.out.println(sets.size());\n\n }\n\n}</code></pre>\n<p>4.Java操作Redis字符串（String）</p>\n<pre class="prettyprint"><code>package com.redis1;\n\nimport redis.clients.jedis.Jedis;\n\n/**\n * Redis String数据类型\n * @author dell\n *\n */\npublic class RedisString {\n\n public static void main(String[] args) {\n //连接本地redis服务\n Jedis jedis = new Jedis("127.0.0.1");\n System.out.println("redis服务连接成功！");\n\n //设置redis字符串数据\n jedis.set("type", "string");\n //获取存储的数据并输出\n System.out.println("redis存储的值为："+jedis.get("type"));\n\n }\n\n}</code></pre>\n<p>5.Java 操作Redis排序</p>\n<pre class="prettyprint"><code>package com.redis2;\n\nimport org.junit.Before;\nimport org.junit.Test;\n\nimport redis.clients.jedis.Jedis;\n\n/**\n * Redis排序\n * @author dell\n *\n */\npublic class Java_RedisTest {\n private Jedis jedis;\n\n @Before\n public void setup(){\n //连接redis服务器\n jedis = new Jedis("127.0.0.1",6379);\n //权限认证\n //jedis.auth("admin");\n }\n\n @Test\n public void test() throws InterruptedException{\n //jedis排序\n //注意，此处的rpush和lpush是List的操作。是一个双向链表（但从表现来看的） \n jedis.del("a"); //先清除数据，在加入数据进行测试\n jedis.rpush("a", "1");\n jedis.rpush("a", "6");\n jedis.rpush("a", "4");\n jedis.rpush("a", "2");\n jedis.rpush("a", "5");\n jedis.rpush("a", "3");\n //排序前\n System.out.println("排序前："+jedis.lrange("a", 0, -1));\n //排序\n System.out.println("排序："+jedis.sort("a"));\n //排序后\n System.out.println("排序后："+jedis.lrange("a", 0, -1));\n }\n}</code></pre>\n<p>更多实例代码，在此不再一一列举，感兴趣的朋友，实例代码见：<br />\n<a href="https://github.com/JavaCodeMood/redis1" target="_blank" rel="nofollow">https://github.com/JavaCodeMood/redis1</a></p>\n<p>多谢各位朋友的支持！</p>"; | |
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| <span class="d-t js-title">NoSQL数据库之-------Redis(二）</span> | |
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| <span class="spacer">2017.02.26 20:19</span> | |
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| <p>上文（<a href="http://www.imooc.com/article/16523）介绍了Redis概念，以及数据类型，安装等，此文将会介绍Java操作redis数据库的数据类型的一些实例" target="_blank" rel="nofollow">http://www.imooc.com/article/16523）介绍了Redis概念，以及数据类型，安装等，此文将会介绍Java操作redis数据库的数据类型的一些实例</a>。<br /> | |
| Redis支持五种数据类型：string（字符串），hash（哈希），list（列表），set（集合）及zset(sorted set：有序集合)。<br /> | |
| 下面将会给出实例：<br /> | |
| 1.Java操作Redis键（key）</p> | |
| <pre class="prettyprint"><code>package com.redis1; | |
| import java.util.List; | |
| import redis.clients.jedis.Jedis; | |
| /** | |
| * Redis keys实例 | |
| * @author dell | |
| * | |
| */ | |
| public class RedisKeys { | |
| public static void main(String[] args) { | |
| //连接redis本地服务 | |
| Jedis jedis = new Jedis("127.0.0.1"); | |
| System.out.println("redis本地服务连接成功！"); | |
| /*Redis Bgsave 命令用于在后台异步保存当前数据库的数据到磁盘。 | |
| BGSAVE 命令执行之后立即返回 OK ，然后 Redis fork 出一个新子进程， | |
| 原来的 Redis 进程(父进程)继续处理客户端请求，而子进程则负责将数据保存到磁盘，然后退出。 | |
| */ | |
| System.out.println(jedis.bgsave()); | |
| //Redis Echo 命令用于打印给定的字符串。 | |
| System.out.println(jedis.echo("redis")); | |
| //Redis Flushall 命令用于清空整个 Redis 服务器的数据(删除所有数据库的所有 key )。 | |
| System.out.println(jedis.flushAll()); | |
| //Redis Flushdb 命令用于清空当前数据库中的所有 key。 | |
| System.out.println(jedis.flushDB()); | |
| /* | |
| Redis Ping 命令使用客户端向 Redis 服务器发送一个 PING ，如果服务器运作正常的话，会返回一个 PONG 。 | |
| 通常用于测试与服务器的连接是否仍然生效，或者用于测量延迟值。 | |
| */ | |
| System.out.println(jedis.ping()); | |
| //Redis Info 命令以一种易于理解和阅读的格式，返回关于 Redis 服务器的各种信息和统计数值。 | |
| System.out.println("\ninfo----->"+jedis.info()); | |
| //Redis RANDOMKEY 命令从当前数据库中随机返回一个 key 。 | |
| System.out.println(jedis.randomKey()); | |
| //Redis Save 命令执行一个同步保存操作，将当前 Redis 实例的所有数据快照(snapshot)以 RDB 文件的形式保存到硬盘。 | |
| System.out.println(jedis.save()); | |
| //Redis Unwatch 命令用于取消 WATCH 命令对所有 key 的监视。 | |
| System.out.println(jedis.unwatch()); | |
| /* | |
| Redis Multi 命令用于标记一个事务块的开始。 | |
| 事务块内的多条命令会按照先后顺序被放进一个队列当中，最后由 EXEC 命令原子性(atomic)地执行。 | |
| */ | |
| System.out.println(jedis.multi()); | |
| /*Redis Quit 命令用于关闭与当前客户端与redis服务的连接。 | |
| 一旦所有等待中的回复(如果有的话)顺利写入到客户端，连接就会被关闭。*/ | |
| System.out.println(jedis.quit()); | |
| } | |
| }</code></pre> | |
| <p>2.Java操作Redis列表（list）</p> | |
| <pre class="prettyprint"><code>package com.redis1; | |
| import java.util.List; | |
| import redis.clients.jedis.BinaryClient; | |
| import redis.clients.jedis.Jedis; | |
| /** | |
| * redis list数据类型 | |
| * | |
| * @author dell | |
| * | |
| */ | |
| public class RedisList { | |
| public static void main(String[] args) { | |
| // 连接本地的 Redis 服务 | |
| Jedis jedis = new Jedis("localhost"); | |
| System.out.println("redis本地服务连接成功！"); | |
| /* | |
| * lpush 表示从list的头部插入元素 rpush 表示从list的尾部插入元素 linsert 在列表的某个元素前或者后插入元素 | |
| * index 表示列表中index位置的元素 llen 返回列表的长度 lpop list 0 -1 | |
| * 表示从mylist列表的头部开始删除所有元素 rpop list 0 -1 表示从mylist列表的尾部开始删除所有元素 lrange | |
| * list 0 -1 //使用lrange取出元素 0表示从头部第一个元素，-1表示从尾部第一个元素取出，lrange mylist 0 | |
| * -1 表示取出mylist中的所有数据 | |
| */ | |
| // 存储数据到列表中 | |
| jedis.lpush("SQL", "Redis"); | |
| jedis.lpush("SQL", "Mongodb"); | |
| jedis.lpush("SQL", "Mysql"); | |
| jedis.linsert("SQL", BinaryClient.LIST_POSITION.BEFORE, "MySql", "java"); | |
| jedis.rpush("SQL", "SqlServer"); | |
| jedis.rpush("SQL", "Oracle"); | |
| jedis.linsert("SQL", BinaryClient.LIST_POSITION.BEFORE, "MySql", "java"); | |
| // Redis Lpushx 将一个或多个值插入到已存在的列表头部，列表不存在时操作无效。 | |
| System.out.println(jedis.lpushx("SQL", "Redis1")); | |
| // 获取存储的数据并输出 | |
| List<String> list = jedis.lrange("SQL", 0, -1); | |
| for (int i = 0; i < list.size(); i++) { | |
| System.out.println("Stored string in redis:: " + list.get(i)); | |
| } | |
| // 获得列表的长度 | |
| System.out.println("redis列表长度为：" + jedis.llen("SQL")); | |
| // 删除列表中的元素 | |
| jedis.del("SQL"); | |
| System.out.println("删除了redis列表！"); | |
| // 获得列表的长度 | |
| System.out.println("redis列表长度为：" + jedis.llen("SQL")); | |
| // 列表下标从0开始 | |
| System.out.println("redis列表下标为5的元素是：" + jedis.lindex("SQL", 5)); | |
| /* | |
| * Redis Ltrim 对一个列表进行修剪(trim)，就是说，让列表只保留指定区间内的元素，不在指定区间之内的元素都将被删除。 下标 0 | |
| * 表示列表的第一个元素，以 1 表示列表的第二个元素，以此类推。 你也可以使用负数下标，以 -1 表示列表的最后一个元素， -2 | |
| * 表示列表的倒数第二个元素，以此类推。 | |
| */ | |
| System.out.println(jedis.ltrim("SQL", 0, 4)); | |
| } | |
| }</code></pre> | |
| <p>3.Java操作Redis集合（set）</p> | |
| <pre class="prettyprint"><code>package com.redis1; | |
| import java.util.Set; | |
| import redis.clients.jedis.Jedis; | |
| /** | |
| * Redis set数据类型 | |
| * @author dell | |
| * | |
| */ | |
| public class RedisSet { | |
| public static void main(String[] args) { | |
| Jedis jedis = new Jedis("127.0.0.1",6379); | |
| //set方法用于向redis数据库中添加设置数据 | |
| jedis.set("k1", "v1"); | |
| jedis.set("k2", "v2"); | |
| jedis.set("k3", "v3"); | |
| //get方法用于获取某个键所对应的值 | |
| System.out.println(jedis.get("k3")); | |
| //del方法用于删除某个键所对应的值 | |
| System.out.println(jedis.del("k1")); | |
| //getSet方法用户获取某个键所对应的值，键不存在，返回null；键存在，返回对应的值 | |
| System.out.println(jedis.getSet("k4", "v4")); | |
| /*getrange(key, startOffset, endOffset)方法用于获取存在在key中字符串的子字符串 | |
| 字符串的截取范围由start和end两个偏移量决定 | |
| */ | |
| System.out.println(jedis.getrange("k2", 1, -1)); | |
| //lpop方法用于移除并返回列表的第一个元素 | |
| System.out.println(jedis.lpop("k1")); | |
| //rpop方法用于移除并返回列表的最后一个元素 | |
| System.out.println(jedis.rpop("k5")); | |
| //返回集合的长度 | |
| Set<String> sets = jedis.keys("*"); | |
| System.out.println(sets.size()); | |
| } | |
| }</code></pre> | |
| <p>4.Java操作Redis字符串（String）</p> | |
| <pre class="prettyprint"><code>package com.redis1; | |
| import redis.clients.jedis.Jedis; | |
| /** | |
| * Redis String数据类型 | |
| * @author dell | |
| * | |
| */ | |
| public class RedisString { | |
| public static void main(String[] args) { | |
| //连接本地redis服务 | |
| Jedis jedis = new Jedis("127.0.0.1"); | |
| System.out.println("redis服务连接成功！"); | |
| //设置redis字符串数据 | |
| jedis.set("type", "string"); | |
| //获取存储的数据并输出 | |
| System.out.println("redis存储的值为："+jedis.get("type")); | |
| } | |
| }</code></pre> | |
| <p>5.Java 操作Redis排序</p> | |
| <pre class="prettyprint"><code>package com.redis2; | |
| import org.junit.Before; | |
| import org.junit.Test; | |
| import redis.clients.jedis.Jedis; | |
| /** | |
| * Redis排序 | |
| * @author dell | |
| * | |
| */ | |
| public class Java_RedisTest { | |
| private Jedis jedis; | |
| @Before | |
| public void setup(){ | |
| //连接redis服务器 | |
| jedis = new Jedis("127.0.0.1",6379); | |
| //权限认证 | |
| //jedis.auth("admin"); | |
| } | |
| @Test | |
| public void test() throws InterruptedException{ | |
| //jedis排序 | |
| //注意，此处的rpush和lpush是List的操作。是一个双向链表（但从表现来看的） | |
| jedis.del("a"); //先清除数据，在加入数据进行测试 | |
| jedis.rpush("a", "1"); | |
| jedis.rpush("a", "6"); | |
| jedis.rpush("a", "4"); | |
| jedis.rpush("a", "2"); | |
| jedis.rpush("a", "5"); | |
| jedis.rpush("a", "3"); | |
| //排序前 | |
| System.out.println("排序前："+jedis.lrange("a", 0, -1)); | |
| //排序 | |
| System.out.println("排序："+jedis.sort("a")); | |
| //排序后 | |
| System.out.println("排序后："+jedis.lrange("a", 0, -1)); | |
| } | |
| }</code></pre> | |
| <p>更多实例代码，在此不再一一列举，感兴趣的朋友，实例代码见：<br /> | |
| <a href="https://github.com/JavaCodeMood/redis1" target="_blank" rel="nofollow">https://github.com/JavaCodeMood/redis1</a></p> | |
| <p>多谢各位朋友的支持！</p> | |
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