How to Send OTP to Mobile Number in Java Spring Boot

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Summary: Learn how to send OTP (One-Time Password) to a mobile number using Java Spring Boot by integrating an SMS service for secure authentication and verification processes.
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Sending OTP (One-Time Password) to a mobile number in Java Spring Boot can be a useful feature for authentication and verification purposes. Spring Boot makes it easy to integrate with various third-party SMS services that allow you to send OTPs to mobile numbers. In this guide, we will walk through the steps to send OTPs in a Spring Boot application.

Choose an SMS Service Provider
First, choose a third-party SMS service provider such as Twilio, Nexmo, or AWS SNS. These providers offer APIs to send SMS messages, including OTPs, to mobile numbers.

Add Dependency to Your Project

Maven:

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Gradle:

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Set Up the SMS Service
In your Spring Boot application, set up the SMS service. For example, if you are using Twilio, initialize the Twilio client with your account SID and authentication token:

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Generate OTP
In your application, create a method to generate a random OTP. This can be a simple method that generates a 4-6 digit random number.

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Use the OTP Service in Your Application
In your Spring Boot application, use the OtpService to send an OTP to a mobile number:

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Conclusion
By following the above steps, you can send OTPs to mobile numbers in a Java Spring Boot application. Make sure to choose a reliable SMS service provider and follow their documentation for specific details on implementation. This method allows you to enhance the security and authentication of your application.