存储格式
大家都知道redis支持的存储类型（String/List/Hash/Set/SortedSet ），但是不一定在工作中都用到过，希望通过整理的这篇文章，让初学者都能知道在java中如何使用redis以及redis对这几种数据类型的操作。
基本用法
jedis就是集成了redis的一些命令操作，封装了redis的java客户端。提供了连接池管理。一般不直接使用jedis，而是在其上在封装一层，作为业务的使用。如果用spring的话，可以看看spring 封装的 redis Spring Data Redis
Jedis工具类
public class JedisPoolUtil { private static JedisPool pool = null; static { //加载配置文件 InputStream in = JedisPoolUtil.class.getClassLoader().getResourceAsStream("redis.properties"); Properties pro = new Properties(); try { pro.load(in); } catch (IOException e) { e.printStackTrace(); System.out.println("加载文件失败"); } JedisPoolConfig poolConfig = new JedisPoolConfig(); //最大连接数 poolConfig.setMaxTotal(Integer.parseInt( pro.get("redis.maxTotal").toString())); //最大空闲连接数 poolConfig.setMaxIdle(Integer.parseInt( pro.get("redis.maxIdle").toString())); //最小空闲连接数 poolConfig.setMinIdle(Integer.parseInt( pro.get("redis.minIdle").toString())); pool = new JedisPool(poolConfig, pro.get("redis.url").toString(),Integer.parseInt( pro.get("redis.port") .toString())); } public static Jedis getJedis(){ return pool.getResource(); } public static void release(Jedis jedis){ if(null != jedis){ jedis.close(); } } } redis配置文件
redis.maxTotal=100 redis.maxIdle=30 redis.minIdle=10 redis.url=172.0.0.1 redis.port=6379 key值测试
public void keyTest{ public Jedis jedis = JedisPoolUtil.getJedis(); @Test private void KeyOperate(){ System.out.println("======================key=========================="); // 清空数据 System.out.println("清空库中所有数据："+jedis.flushDB()); // 判断key否存在 System.out.println("判断key999键是否存在："+shardedJedis.exists("key999")); System.out.println("新增key001,value001键值对："+shardedJedis.set("key001", "value001")); System.out.println("判断key001是否存在："+shardedJedis.exists("key001")); // 输出系统中所有的key System.out.println("新增key002,value002键值对："+shardedJedis.set("key002", "value002")); System.out.println("系统中所有键如下："); Set<String> keys = jedis.keys("*"); Iterator<String> it=keys.iterator() ; while(it.hasNext()){ String key = it.next(); System.out.println(key); } // 删除某个key,若key不存在，则忽略该命令。 System.out.println("系统中删除key002: "+jedis.del("key002")); System.out.println("判断key002是否存在："+shardedJedis.exists("key002")); // 设置 key001的过期时间 System.out.println("设置 key001的过期时间为5秒:"+jedis.expire("key001", 5)); try{ Thread.sleep(2000); } catch (InterruptedException e){ } // 查看某个key的剩余生存时间,单位【秒】.永久生存或者不存在的都返回-1 System.out.println("查看key001的剩余生存时间："+jedis.ttl("key001")); // 移除某个key的生存时间 System.out.println("移除key001的生存时间："+jedis.persist("key001")); System.out.println("查看key001的剩余生存时间："+jedis.ttl("key001")); // 查看key所储存的值的类型 System.out.println("查看key所储存的值的类型："+jedis.type("key001")); /* * 一些其他方法：1、修改键名：jedis.rename("key6", "key0"); * 2、将当前db的key移动到给定的db当中：jedis.move("foo", 1) */ } } String测试
public class StringTest { public Jedis jedis = JedisPoolUtil.getJedis(); @Test //添加和获取 public void fun(){ jedis.set("num","1"); System.out.println(jedis.get("num")); } @Test //删除值 public void fun1(){ jedis.del("num"); System.out.println(jedis.get("num")); } @Test //自减和自减 public void fun2(){ jedis.set("num","1"); System.out.println(jedis.get("num")); jedis.decr("num"); System.out.println(jedis.get("num")); jedis.incr("num"); jedis.incr("num"); System.out.println(jedis.get("num")); } @Test //加上/减去 一个数 //incrBy 返回的是修改之后的值如果原值是字符串不是数字，则会抛出异常 public void fun3(){ Long num = jedis.incrBy("num", 3); System.out.println(num); jedis.decrBy("num",10); System.out.println(jedis.get("num")); jedis.set("name","caopengfei"); //jedis.decrBy("name",1); } @Test //字符串拼接 public void fun4(){ Long len = jedis.append("name", "123"); System.out.println(len); System.out.println(jedis.get("name")); } @Test //多键值操作 public void fun5(){ System.out.println("一次性新增key201,key202,key203,key204及其对应值："+jedis.mset("key201","value201", "key202","value202","key203","value203","key204","value204")); System.out.println("一次性获取key201,key202,key203,key204各自对应的值："+ jedis.mget("key201","key202","key203","key204")); System.out.println("一次性删除key201,key202："+jedis.del(new String[]{"key201", "key202"})); System.out.println("一次性获取key201,key202,key203,key204各自对应的值："+ jedis.mget("key201","key202","key203","key204")); System.out.println(); } } Hash测试
public class HashTest { public Jedis jedis = JedisPoolUtil.getJedis(); //hash 操作的是map对象 //适合存储键值对象的信息 @Test //存值 参数第一个变量的名称， map键名(key)， map键值(value) //调用hset public void fun() { Long num = jedis.hset("hash1", "username", "caopengfei"); System.out.println(num); String hget = jedis.hget("hash1", "username"); System.out.println(hget); } @Test //也可以存多个key //调用hmset public void fun1() { Map<String, String> map = new HashMap<String, String>(); map.put("username", "caopengfei"); map.put("age", "25"); map.put("sex", "男"); String res = jedis.hmset("hash2", map); System.out.println(res);//ok } @Test //获取hash中所有的值 public void fun2() { Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } @Test //删除hash中的键 可以删除一个也可以删除多个，返回的是删除的个数 public void fun3() { Long num = jedis.hdel("hash2", "username", "age"); System.out.println(num); Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } @Test //增加hash中的键值对 public void fun4() { Map<String, String> map2 = new HashMap<String, String>(); map2 = jedis.hgetAll("hash2"); System.out.println(map2); jedis.hincrBy("hash2", "age", 10); map2 = jedis.hgetAll("hash2"); System.out.println(map2); } @Test //判断hash是否存在某个值 public void fun5() { System.out.println(jedis.hexists("hash2", "username")); System.out.println(jedis.hexists("hash2", "age")); } @Test //获取hash中键值对的个数 public void fun6() { System.out.println(jedis.hlen("hash2")); } // 获取一个hash中所有的key值 @Test public void fun7() { Set<String> hash2 = jedis.hkeys("hash2"); System.out.println(hash2); } // 获取所有的value值 @Test public void fun8() { List<String> hash2 = jedis.hvals("hash2"); System.out.println(hash2); } } List测试
public class ListTest { public Jedis jedis = JedisPoolUtil.getJedis(); @Test public void testList() { 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 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测试
/* * Set集合，和List类的区别就是 * set中不会出现重复的数据 * 他可以进行聚合操作效率比较高 * 其余的操作基本上和list相同 * * */ public class SetTest { public Jedis jedis = JedisPoolUtil.getJedis(); @Test /*添加元素删除元素*/ public void fun(){ Long num = jedis.sadd("myset", "a", "a", "b","abc"); System.out.println(num); } @Test /*获得元素*/ public void fun1(){ Set<String> myset = jedis.smembers("myset"); System.out.println(myset); } @Test /*移除元素*/ public void fun2(){ jedis.srem("myset","a","b"); Set<String> myset = jedis.smembers("myset"); System.out.println(myset); } @Test //判断是否这个set中存在某个值 public void fun3(){ Boolean sismember = jedis.sismember("myset", "a"); System.out.println(sismember); } @Test //获得A-B 获得差集合 public void fun4(){ jedis.sadd("myset1","123","32","abc","def","123456","sdfasd"); jedis.sadd("myset2","abc","345","123","fda"); Set<String> sdiff = jedis.sdiff("myset1", "myset2"); System.out.println(sdiff); } @Test //获得交集 public void fun5(){ Set<String> sinter = jedis.sinter("myset1", "myset2"); System.out.println(sinter); } @Test //获得并集合 public void fun6(){ Set<String> sunion = jedis.sunion("myset1", "myset2"); System.out.println(sunion); } @Test //成员数量 public void fun7(){ System.out.println(jedis.scard("myset1")); } @Test //获得随机的一个成员 public void fun8(){ System.out.println(jedis.srandmember("myset1")); } @Test //将相差的成员放到一个新的set中同理交集和并集都可以后面均 //加上一个store即可 //并返回新的长度 public void fun9(){ System.out.println(jedis.sdiffstore("myset3","myset1","myset2")); System.out.println(jedis.smembers("myset3")); } } SortedSet 测试
/* 和set极为的类似，他们是字符串的集合，没有重复的数据 差别是sortedset每个成员中都会有一个分数（score）与之关联 ，redis正是通过分数来为集合中的成员进行从小到大的排序 sortedset中数据必须单一但是他的score可以是重复的 */ public class SortedsetTest { public Jedis jedis = JedisPoolUtil.getJedis(); //添加元素 @Test public void fun(){ jedis.zadd("mysort",100.0, "zhangsan"); jedis.zadd("mysort",200.0,"lisi"); jedis.zadd("mysort",50.0,"wangwu"); Map<String ,Double>map = new HashMap<String ,Double>(); map.put("mutouliu",70.0); jedis.zadd("mysort",map); Set<String> mysort = jedis.zrange("mysort", 0, -1); System.out.println(mysort); Set<String> mysort1 = jedis.zrange("mysort", 1, 2); System.out.println(mysort1); } }
来源：CSDN
作者：轩辕小僧
链接：https://blog.csdn.net/fan1865221/article/details/82492898