常用API之Key

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

        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','kuangsheng'>的键值对："+jedis.set("username","kuangsheng"));
        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的数目："+jedis.dbSize());
        System.out.println("删除所有数据库中的所有key："+jedis.flushAll());

    }