java中Redis5大基本类型的用法

Posted 2020-11-23 潇湘客2

存储格式

 

 

 

基本用法

通过Jedis(封装了redis的Java客户端)对redis进行操作。

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=192.168.202.200 
redis.port=6379

 

String

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"));
    }
}

 

Hash

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

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

/*
* 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"));
    }
}

 

Sorted/*

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);
    }

}