短信验证码
每一条，5 秒必达

import okhttp3.*;
import org.json.JSONObject;

public class SmsSender {
    public static String sendSMS(JSONObject params) {
        String url = "https://smssh1.253.com/msg/v1/send/json";
        MediaType JSON = MediaType.get("application/json; charset=utf-8");

        OkHttpClient client = new OkHttpClient();
        RequestBody body = RequestBody.create(params.toString(), JSON);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();

        try (Response response = client.newCall(request).execute()) {
            return response.body().string();
        } catch (Exception e) {
            return e.getMessage();
        }
    }

    // 调用示例
    // JSONObject params = new JSONObject();
    // params.put("account", "账号");
    // System.out.println(sendSMS(params));
}