How to Send SMS Verification Codes with Alibaba Cloud’s SendSms API

Introduction

Anyone who has used a mobile app has encountered the SMS verification code feature, and developers often need to implement it.

Alibaba Cloud SMS Service – SendSms

The article introduces Alibaba Cloud’s SMS service and explains that the SendSms API is used for sending single SMS messages, with limited batch support (up to 1000 numbers, with possible delay).

Prerequisites

Before sending, you must apply for an SMS signature and template and ensure they have passed review.

Usage Instructions

Single‑message sending uses the SendSms interface; for different signatures or templates per number, the SendBatchSms interface is required.

If the verification‑code signature and the generic signature share the same name, the system defaults to the generic signature.

Code Example

public ApiResult sendMsg(String mobile) throws Exception {
    String randomNumber = RandomUtils.getRandomNumber(6);
    SendSmsRequest sendSmsRequest = new SendSmsRequest();
    sendSmsRequest.setPhoneNumbers(mobile);
    sendSmsRequest.setSignName("你的签名");
    sendSmsRequest.setTemplateCode("你的模板代码");
    String json = "{'code':'" + randomNumber + "'}";
    sendSmsRequest.setTemplateParam(json);

    SendSmsResponse resp = AliSms.sendSms(sendSmsRequest, "你的acckey", "你的acckey对应秘钥串");
    if (resp.getBody().getCode().equalsIgnoreCase("ok")){
        String key = mobile + "_code";
        redisService.set(key,randomNumber,5L, TimeUnit.MINUTES);
        String o = (String)redisService.get(key);
        System.out.println(o);
        System.out.println(resp.toString());
    }
    com.aliyun.teaconsole.Client.log(com.aliyun.teautil.Common.toJSONString(TeaModel.buildMap(resp)));
    return new ApiResult();
}

The code demonstrates generating a 6‑digit random code, setting the phone number, signature, template, and sending the request, then storing the code in Redis for five minutes.