我们要使用Java来操作Redis
Jedis 是 Redis 官方推荐的java连接开发工具！使用Java操作Redis的中间件！如果你要使用java操作redis，那么一定要对jedis十分熟悉！
1、导入对应的依赖
<dependencies> <!--导入jedis的包--> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>3.3.0</version> </dependency> <!--fastjack--> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.60</version> </dependency> </dependencies>2、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 对象即可 Jedis jedis = new Jedis("127.0.0.1",6379); // jedis 所有的命令就是我们之前学习的所有指令！所以之前的指令学习很重要 System.out.println(jedis.ping()); } }输出：
对key的操作
public static void main(String[] args) { 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','tonychen'>的键值对："+jedis.set("username","tonychen")); System.out.println("新增<'password','password'>的键值对："+jedis.set("password","password")); System.out.println("系统中所有的键如下："); 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所存储的值的类型："+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("取出改后的name："+jedis.get("name")); System.out.println("按索引查询："+jedis.select(0)); System.out.println("删除当前选择数据库中的所有key："+jedis.flushDB()); System.out.println("返回当前数据库中key的条目："+jedis.dbSize()); System.out.println("删除所有数据库中的所有key："+jedis.flushAll()); }String
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("ke3的值："+jedis.get("key3")); System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03","key04","value04")); 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，跟新为新值============"); System.out.println(jedis.getSet("key2","key2GetSet")); System.out.println(jedis.get("key2")); System.out.println("截取1获取key2的值的字符："+jedis.getrange("key2",2,4)); }List
public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); System.out.println("=========添加一个list========="); jedis.lpush("collections","ArrayList","Vector","Stack","HashMap","WeakHashMap","LinkedList"); jedis.lpush("collections","HashSet"); jedis.lpush("collections","TreeSet"); jedis.lpush("collections","TreeMap"); System.out.println("collections的内容："+jedis.lrange("collections",0,-1)); // 0到-1代表查询是所有 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("删除指定的元素个数："+jedis.lrem("collections",2,"HashMap")); System.out.println("collections的内容："+jedis.lrange("collections",0,-1)); // 0到-1代表查询是所有 System.out.println("删除下标0~3区间之外的元素："+jedis.lrange("collections",0,-1)); System.out.println("collections的内容："+jedis.lrange("collections",0,-1)); // 0到-1代表查询是所有 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)); // 0到-1代表查询是所有 System.out.println("collections添加元素，从列表右端，于lpush相对应："+jedis.rpush("collections","new")); System.out.println("collections的内容："+jedis.lrange("collections",0,-1)); // 0到-1代表查询是所有 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)); // 0到-1代表查询是所有 System.out.println("修改collections指定下标为1的内容:"+jedis.lset("collections",1,"new2")); System.out.println("collections的内容："+jedis.lrange("collections",0,-1)); // 0到-1代表查询是所有 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("soredList","3","6","2","0","7","4"); System.out.println("soredList排序前："+jedis.lrange("soredList",0,-1)); System.out.println(jedis.sort("soredList")); System.out.println("soredList排序后："+jedis.lrange("soredList",0,-1)); }Set
public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); 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e6和e7："+jedis.srem("eleSet","e6","e7")); 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中的所有元素为："+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","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,并且粗如eleSet3中："+jedis.smove("eleSet1","eleSet3","e1")); System.out.println("将eleSet1中删除e2,并且粗如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中的交集"+jedis.sinter("eleSet1","eleSet2")); System.out.println("eleSet1和eleSet2中的并集"+jedis.sunion("eleSet1","eleSet2")); System.out.println("eleSet1和eleSet2中的差集"+jedis.sdiff("eleSet1","eleSet2")); jedis.sinterstore("eleSet4","eleSet1","eleSet2"); // 求交集并将交集保存到eleSet4中 System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4")); }Hash
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的所有键为："+jedis.hkeys("hash")); System.out.println("散列hash的所有值为："+jedis.hvals("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.hsetnx("hash","key6","value6")); 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.hsetnx("hash","key6","value7")); 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")); }Zset
正常执行
public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); JSONObject jsonObject = new JSONObject(); jsonObject.put("hello","world"); jsonObject.put("name","tonyChen"); // 开启事务 Transaction multi = jedis.multi(); String result = jsonObject.toJSONString(); try { multi.set("user1",result); multi.set("user2",result); multi.exec(); // 执行事务 } catch (Exception e){ multi.discard(); // 放弃事务 e.printStackTrace(); } finally { System.out.println(jedis.get("user1")); System.out.println(jedis.get("user2")); jedis.close(); // 关闭连接 } }结果：
模拟错误
public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); jedis.flushDB(); JSONObject jsonObject = new JSONObject(); jsonObject.put("hello","world"); jsonObject.put("name","tonyChen"); // 开启事务 Transaction multi = jedis.multi(); String result = jsonObject.toJSONString(); // jedis.watch(result); try { multi.set("user1",result); multi.set("user2",result); int i = 1/0; // 代码抛出异常 multi.exec(); // 执行事务 } catch (Exception e){ multi.discard(); // 放弃事务 e.printStackTrace(); } finally { System.out.println(jedis.get("user1")); System.out.println(jedis.get("user2")); jedis.close(); // 关闭连接 } }结果：
学校视频连接：https://www.bilibili.com/video/BV1S54y1R7SB?p=25
