public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1",6379);
        jedis.auth("12345");

        System.out.println("清空資料："+jedis.flushDB());
        System.out.println("判斷某個鍵是否存在："+jedis.exists("username"));
        System.out.println("新增<'username','kuangsheng'>的鍵值對："+jedis.set("username","kuangsheng"));
        System.out.println("新增<'password','password'>的鍵值對："+jedis.set("password","password"));
        System.out.println("系統中所有的鍵如下：");
        Set<String> keys = jedis.keys("*");
        System.out.println(keys);
        System.out.println("刪除鍵password："+jedis.del("password"));
        System.out.println("判斷鍵password是否存在："+jedis.exists("password"));
        System.out.println("檢視鍵username所儲存的值的型別："+jedis.type("username"));
        System.out.println("隨機返回key空間的一個："+jedis.randomKey());
        System.out.println("重新命名key："+jedis.rename("username","name"));
        System.out.println("取出改後的name："+jedis.get("name"));
        System.out.println("按索引查詢："+jedis.select(0));
        System.out.println("刪除當前選擇資料庫中的所有key："+jedis.flushDB());
        System.out.println("返回當前資料庫中key的數目："+jedis.dbSize());
        System.out.println("刪除所有資料庫中的所有key："+jedis.flushAll());

    }