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Jedis
2021-01-17 00:26:10Jedis前言什么是Jedis为什么要使用Jedis1、导入对应的依赖2、编码测试3、常用的API3.1 String3.2 List3.3 Set3.4 Hash3.5 Key3.6 Password4、通过Jedis再次理解 事务 前言 提示:本文章是日常学习内容的总结,并非...Jedis
前言
提示:本文章是日常学习内容的总结,并非全部原创;仅供大家参考借鉴,并无其他商业用途。Bilibili搜索关注:狂神说
真正在公司中的实践:NoSQL + RDBMS 一起使用才是最强的,阿里巴巴的架构演进!
技术没有高低之分,就看你如何去使用!(提升内功,思维的提高!)
云计算的长征之路:阿里云的这群疯子什么是Jedis
是Jedis 是 Redis 官方推荐的 java连接开发工具!
是使用Java 操作Redis 中间件!
如果你要使用java去操作redis
那么一定要对Jedis 十分的熟悉!为什么要使用Jedis
知其然并知其所以然,授人以渔! 学习不能急躁,慢慢来会很快!
先了解Jedis,再用spring-data-redis去整合
所以我们要先使用 Java 来操作 Redis,1、导入对应的依赖
<!--导入jedis的包--> <dependencies> <!-- https://mvnrepository.com/artifact/redis.clients/jedis --> <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> </dependencies>
2、编码测试
1. 连接数据库
2. 操作命令
3. 断开连接!package com.kuang; import redis.clients.jedis.Jedis; public class TestPing { public static void main(String[] args) { // new Jedis 对象即可 Jedis jedis = new Jedis("127.0.0.1",6379); // jedis 所有的命令就是redis-cli客户端的所有指令! System.out.println(jedis.ping()); } }
4. 输出
3、常用的API
所有的api命令,都对应前面文章的五大数据类型的指令,一个都没有变化!
3.1 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("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)); }
3.2 List
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)); }
3.3 Set
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")); //移到集合元素 System.out.println("将eleSet1中删除e1并存入eleSet3中:"+jedis.smove("eleSet1", "eleSet3", "e1")); 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")); }
3.4 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")); }
3.5 Key
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','kuangshen'>的键值对:"+jedis.set("username", "kuangshen")); System.out.println("新增<'password','password'>的键值对:"+jedis.set("password", "password")); System.out.print("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的数目:"+jedis.dbSize()); System.out.println("删除所有数据库中的所有key:"+jedis.flushAll()); }
3.6 Password
public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1", 6379); //验证密码,如果没有设置密码这段代码省略 //jedis.auth("password"); jedis.connect(); //连接 jedis.disconnect(); //断开连接 jedis.flushAll(); //清空所有的key }
4、通过Jedis再次理解 事务
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); //故意引发ArithmeticException: / by zero异常 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(); } }
结果:由于异常,事务回滚。json,json2没有执行成功,返回null。
java.lang.ArithmeticException: / by zero at com.kuang.multi.TestMulti.main(TestMulti.java:26) null null
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jedis
2019-05-06 20:30:45package com.imooc.jedis; import org.junit.Test;...import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class JedisDemo1 { /**...package com.imooc.jedis; import org.junit.Test; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class JedisDemo1 { /** * jedis测试 */ @Test public void demo01() { //1.设置IP地址和端口 Jedis jedis = new Jedis("192.168.2.128",6379); //2.保存数据 jedis.set("name", "zhangsan"); //3.获取数据 String value = jedis.get("name"); System.out.println(value); //4.释放资源 jedis.close(); } /** * 连接池连接方式 */ @Test public void demo02() { //获得连接池的配置对象 JedisPoolConfig config = new JedisPoolConfig(); //设置最大连接数 config.setMaxTotal(30); //设置最大空闲连接数 config.setMaxIdle(10); //获取连接池 JedisPool jedispool = new JedisPool(config, "192.168.2.128", 6379); Jedis jedis = null; try { //获取核心对象 jedis = jedispool.getResource(); //设置数据 jedis.set("name", "张三"); //获取数据 String value = jedis.get("name"); System.out.println(value); }catch(Exception e) { e.printStackTrace(); }finally { if(jedis != null) { jedis.close(); } if(jedispool != null) { jedispool.close(); } } } }
注意事项:
1、Java建立简单的测试单元,但是运行时会报错,因为linux中没有将6379端口打开。
2、vim /etc/sysconfig/iptables。yy复制22端口那一行,p粘贴修改为6379。
3、重启防火墙service iptables restart
jedis需要的jar包
commons-pool2-2.3.jar
jedis-2.7.0.jar
链接:https://pan.baidu.com/s/1SmoofHfS-dFcnhKC8nQZ9Q
提取码:0of7
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