Jedis
使用Java来操作Redis
什么是Jedis 是Redis官方推荐的Java操作Redis中间件, 如果你要使用Java操作Redis, 那么就该对jedis熟悉
测试
- 导入对应的依赖
<!-- 导入jedisd的包 --> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>3.2.0</version> </dependency> <!-- fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.62</version> </dependency>
- 编码测试
- 连接数据库
- 操作命令
- 断开连接
PING
@Test void TestPing() { //1 new Jedis 对象即可 Jedis jedis = new Jedis("127.0.0.1", 6379); //jedis 所有的命令就是他的基本命令, 就是对象的方法 System.out.println(jedis.ping());; }
输出PONG
常用API
- String
- List
- Set
- Hash
- Zset
Redis-key
@Test void TestKey() { Jedis jedis = new Jedis("127.0.0.1", 6379); 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, mxz>的键值对'" + jedis.set("username", "mxz")); System.out.println("新增'<password, mxz>的键值对'" + jedis.set("password", "mxz")); System.out.println("系统中所有的键值对如下: "); 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("查看键username所存储值的类型: " + jedis.type("username")); System.out.println("随机返回key空间的一个: " + jedis.randomKey()); System.out.println("重命名key: " + jedis.rename("username", "name")); System.out.println("按索引查询: " + jedis.select(0)); System.out.println("删除当前选择数据库的所有的key: " + jedis.flushDB()); System.out.println("返回当前数据库中key的数目: " + jedis.dbSize()); System.out.println("删除所有数据库中的所有的key: " + jedis.flushAll()); }
输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.4.1) 2021-01-08 19:28:31.602 INFO 7492 --- [ main] cn.com.codincge.RedisApplicationTests : Starting RedisApplicationTests using Java 1.8.0_181 on DESKTOP-GMI8GKQ with PID 7492 (started by mxz in D:\mxz_code\codingce-java\codingce-redis\redis-01-jedis) 2021-01-08 19:28:31.608 INFO 7492 --- [ main] cn.com.codincge.RedisApplicationTests : No active profile set, falling back to default profiles: default 2021-01-08 19:28:32.290 INFO 7492 --- [ main] cn.com.codincge.RedisApplicationTests : Started RedisApplicationTests in 1.133 seconds (JVM running for 3.804) 清空数据OK 判断某个键是否存在: false 新增'<username, mxz>的键值对'OK 新增'<password, mxz>的键值对'OK 系统中所有的键值对如下: [password, username] 删除键password: 1 判断键password是否存在: false 查看键username所存储值的类型: string 随机返回key空间的一个: username 重命名key: OK 按索引查询: OK 删除当前选择数据库的所有的key: OK 返回当前数据库中key的数目: 0 删除所有数据库中的所有的key: OK
String(字符串)
@Test void TestString() { Jedis jedis = new Jedis("127.0.0.1", 6379); 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", "valueChanged")); 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")); 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("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")); try { TimeUnit.SECONDS.sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(jedis.get("key3")); System.out.println("=====获取原值, 更新为新值====="); System.out.println(jedis.getSet("key2", "key2GetSet")); System.out.println(jedis.get("key2")); System.out.println("获得key2的值字符串: " + jedis.getrange("key2", 2, 4)); }
输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.4.1) 2021-01-09 09:56:23.763 INFO 9088 --- [ main] cn.com.codincge.RedisApplicationTests : Starting RedisApplicationTests using Java 1.8.0_181 on DESKTOP-GMI8GKQ with PID 9088 (started by mxz in D:\mxz_code\codingce-java\codingce-redis\redis-01-jedis) 2021-01-09 09:56:23.825 INFO 9088 --- [ main] cn.com.codincge.RedisApplicationTests : No active profile set, falling back to default profiles: default 2021-01-09 09:56:25.462 INFO 9088 --- [ main] cn.com.codincge.RedisApplicationTests : Started RedisApplicationTests in 2.349 seconds (JVM running for 5.252) =====增加数据===== OK OK OK 删除键key21 获取键key2null 修改key1OK 获取key1的值valueChanged 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, null] 获取多个键值对: [value01, value02, null, null] 删除多个键值对: 2 获取多个键值对: [null, null, null] =====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的值字符串: y2G
List(列表)
@Test void TestList() { Jedis jedis = new Jedis("127.0.0.1", 6379); 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 System.out.println("collections区间 0-3 的元素: " + jedis.lrange("collections", 2, 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("collectionws", 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", "test")); 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("collections指定下标 1 的内容: " + jedis.lset("collections", 1, "FLinkedHashMap")); 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", "4", "5", "7", "9"); 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
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.4.1) 2021-01-09 10:43:37.900 INFO 12624 --- [ main] cn.com.codincge.RedisApplicationTests : Starting RedisApplicationTests using Java 1.8.0_181 on DESKTOP-GMI8GKQ with PID 12624 (started by mxz in D:\mxz_code\codingce-java\codingce-redis\redis-01-jedis) 2021-01-09 10:43:37.900 INFO 12624 --- [ main] cn.com.codincge.RedisApplicationTests : No active profile set, falling back to default profiles: default 2021-01-09 10:43:38.572 INFO 12624 --- [ main] cn.com.codincge.RedisApplicationTests : Started RedisApplicationTests in 0.997 seconds (JVM running for 2.26) =====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: [HashSet, LinkedHashMap] =========================================== 删除指定元素个数: 0 collections的内容: [TreeMap, TreeSet, HashSet, LinkedHashMap, WeakHashMap, HashMap, Stack, Vector, ArrayList] 删除下表0-3区间之外的元素: OK collections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, test] collections列表出栈(右端): test collections的内容: [TreeSet, HashSet, LinkedHashMap] collections指定下标 1 的内容: OK collections的内容: [TreeSet, FLinkedHashMap, LinkedHashMap] =========================================== collections的长度: 3 获取collections下标为 2 的元素LinkedHashMap =========================================== sortedList排序前: [9, 7, 5, 4, 2, 6, 3] [2, 3, 4, 5, 6, 7, 9] sortedList排序后：[9, 7, 5, 4, 2, 6, 3]
Set(集合)
@Test void TestSet() { Jedis jedis = new Jedis("127.0.0.1", 6379); jedis.flushDB(); System.out.println("======向集合中添加元素(不重复)======"); System.out.println(jedis.sadd("eleSet", "e0", "e1", "e2", "e3", "e4", "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("删除两个元素e6 e7" + jedis.srem("eleSet", "e7", "e6")); System.out.println("eleSet的所有元素为: " + jedis.smembers("eleSet")); System.out.println("随机移除集合中的一个元素: " + jedis.spop("eleSet")); System.out.println("随机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")); System.out.println("========================================"); System.out.println(jedis.sadd("eleSet1", "e0", "e1", "e2", "e3", "e4", "e5")); System.out.println(jedis.sadd("eleSet2", "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8")); System.out.println("将eleSet1中删除e1并存入eleSet3中: " + jedis.smove("eleSet1", "eleSet3", "e1")); System.out.println("将eleSet2中删除e2并存入eleSet3中: " + jedis.smove("eleSet2", "eleSet3", "e2")); 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("=====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 jedis.sinterstore("eleSet4", "eleSet1", "eleSet2"); //求交集并将交集保存到 dstkey的集合 System.out.println("eleSet4中的元素: " + jedis.smembers("eleSet4")); }
输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.4.1) 2021-01-09 11:25:15.843 INFO 6516 --- [ main] cn.com.codincge.RedisApplicationTests : Starting RedisApplicationTests using Java 1.8.0_181 on DESKTOP-GMI8GKQ with PID 6516 (started by mxz in D:\mxz_code\codingce-java\codingce-redis\redis-01-jedis) 2021-01-09 11:25:15.843 INFO 6516 --- [ main] cn.com.codincge.RedisApplicationTests : No active profile set, falling back to default profiles: default 2021-01-09 11:25:16.718 INFO 6516 --- [ main] cn.com.codincge.RedisApplicationTests : Started RedisApplicationTests in 1.207 seconds (JVM running for 2.739) ======向集合中添加元素(不重复)====== 6 1 0 eleSet的所有元素为: [e5, e1, e0, e2, e3, e6, e4] 删除一个元素e01 删除两个元素e6 e71 eleSet的所有元素为: [e5, e1, e2, e3, e4] 随机移除集合中的一个元素: e5 随机移除集合中的一个元素: e2 eleSet的所有元素为: [e1, e3, e4] eleSet中包含元素的个数: 3 e3是否在eleSet中: true e1是否在eleSet中: true e5是否在eleSet中: false ======================================== 6 9 将eleSet1中删除e1并存入eleSet3中: 1 将eleSet2中删除e2并存入eleSet3中: 1 eleSet1中的元素: [e3, e5, e0, e2, e4] eleSet2中的元素: [e1, e0, e3, e6, e4, e8, e5, e7] =====集合运算===== eleSet1中的元素: [e3, e5, e0, e2, e4] eleSet2中的元素: [e1, e0, e3, e6, e4, e8, e5, e7] eleSet1和eleSet2的交集[e3, e5, e0, e4] eleSet1和eleSet2的并集[e7, e5, e1, e0, e8, e2, e3, e4, e6] eleSet1和eleSet2的差集[e2] eleSet4中的元素: [e0, e5, e4, e3]
Hash(哈希)
@Test void TestHash() { Jedis jedis = new Jedis("127.0.0.1", 6379); jedis.flushDB(); Map<String, String> map = new HashMap<>(); map.put("key1", "value1"); map.put("key2", "value2"); map.put("key3", "value3"); map.put("key4", "value4"); //添加名称为hash(key) 的hash元素 jedis.hmset("hash", map); //向名称为hash的hash中添加key为key5, value为value5的元素 jedis.hset("hash", "key5", "value5"); System.out.println("散列hash的所有键值对为: " + jedis.hgetAll("hash")); System.out.println("散列hash的所有的键为: " + jedis.hkeys("hash")); //return Set<String> System.out.println("散列hash的所有的值为: " + 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", 1)); 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.hincrByFloat("hash", "key6", 1.0)); System.out.println("散列hash的所有键值对为: " + jedis.hgetAll("hash")); System.out.println("删除一个或多个键值对: " + 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的所有键值对个数: " + jedis.hlen("hash")); System.out.println("判断散列hash中是否存在key2: " + jedis.hexists("hash", "key2")); System.out.println("判断散列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
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.4.1) 2021-01-09 13:27:34.237 INFO 11788 --- [ main] cn.com.codincge.RedisApplicationTests : Starting RedisApplicationTests using Java 1.8.0_181 on DESKTOP-GMI8GKQ with PID 11788 (started by mxz in D:\mxz_code\codingce-java\codingce-redis\redis-01-jedis) 2021-01-09 13:27:34.242 INFO 11788 --- [ main] cn.com.codincge.RedisApplicationTests : No active profile set, falling back to default profiles: default 2021-01-09 13:27:35.059 INFO 11788 --- [ main] cn.com.codincge.RedisApplicationTests : Started RedisApplicationTests in 1.276 seconds (JVM running for 3.17) 散列hash的所有键值对为: {key1=value1, key2=value2, key5=value5, key3=value3, key4=value4} 散列hash的所有的键为: [key1, key2, key5, key3, key4] 散列hash的所有的值为: [value1, value3, value4, value2, value5] 将key6保存的值加上一个整数, 如果key6不存在则添加key6: 1 散列hash的所有键值对为: {key1=value1, key2=value2, key5=value5, key6=1, key3=value3, key4=value4} 将key6保存的值加上一个整数, 如果key6不存在则添加key6: 2.0 散列hash的所有键值对为: {key1=value1, key2=value2, key5=value5, key6=2, key3=value3, key4=value4} 删除一个或多个键值对: 1 散列hash的所有键值对为: {key1=value1, key5=value5, key6=2, key3=value3, key4=value4} 散列hash的所有键值对个数: 5 判断散列hash中是否存在key2: false 判断散列hash中是否存在key3: true 获取hash中的值: [value3] 获取hash中的值: [value3, value4]
