6miu盘搜

7.Jedis

it2025-01-09 7

Jedis

使用java来操作Redis

什么是Jedis ？ Redis官方推荐的java连接开发工具

测试

导入对应依赖  <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency>  <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.74</version> </dependency> 编码测试连接数据库操作命令断开连接 public class TestPing { public static void main(String[] args) { // 1. new Jedis对象 Jedis jedis = new Jedis("127.0.0.1", 6379); System.out.println(jedis.ping()); } }

输出：

常用API

String

public class TestString { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1", 6379); 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("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的值的字串："+jedis.getrange("key2", 2, 4)); }

List

public class TestList { public static void main(String[] args) { 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代表倒数第一个元素，-2代表倒数第二个元素,end为-1表示查询全部 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)); } }

Set

public class TestSet { public static void main(String[] args) { 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", "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"));//移到集合元素 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 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")); } }

Hash

public class TestHash { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1", 6379); jedis.flushDB(); Map<String,String> map = new HashMap<String,String>(); 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元素 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")); } }

Zset

事务

public class TestMulti { public static void main(String[] args) { //创建客户端连接服务端，redis服务端需要被开启 Jedis jedis = new Jedis("127.0.0.1", 6379); jedis.flushDB(); JSONObject jsonObject = new JSONObject(); jsonObject.put("hello", "world"); jsonObject.put("name", "java"); //开启事务 Transaction multi = jedis.multi(); String result = jsonObject.toJSONString(); try{ //向redis存入一条数据 multi.set("json", result); //再存入一条数据 multi.set("json2", result); //这里引发了异常，用0作为被除数 int i = 100/0; //如果没有引发异常，执行进入队列的命令 multi.exec(); }catch(Exception e){ e.printStackTrace(); //如果出现异常，回滚 multi.discard(); }finally{ System.out.println(jedis.get("json")); System.out.println(jedis.get("json2")); //最终关闭客户端 jedis.close(); } } }

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