How to Send SMS in Java with Example

Sending SMS messages in Java is a fairly common task, and there are a number of libraries and APIs available to help you do it. One popular option is to use a SMS gateway, which is a service that allows you to send SMS messages through an API. There are several SMS gateways available, some of which are free and some of which require payment.

Here's an example of how to send an SMS message using the Twilio SMS gateway in Java:

1. First, you need to sign up for a Twilio account and obtain an Account SID and Auth Token.
2. Add the Twilio Java library to your project by adding the following dependency to your build file:

<dependency>
    <groupId>com.twilio.sdk</groupId>
    <artifactId>twilio</artifactId>
    <version>7.54.0</version>
</dependency>

3. Next, import the necessary classes and create a new Twilio object with your Account SID and Auth Token:

import com.twilio.Twilio;
import com.twilio.rest.api.v2010.account.Message;
import com.twilio.type.PhoneNumber;

public class SendSms {
    public static final String ACCOUNT_SID = "your_account_sid";
    public static final String AUTH_TOKEN = "your_auth_token";

    public static void main(String[] args) {
        Twilio.init(ACCOUNT_SID, AUTH_TOKEN);

        Message message = Message.creator(
                new PhoneNumber("+1234567890"),
                new PhoneNumber("+0987654321"),
                "Hello, World!"
        ).create();

        System.out.println(message.getSid());
    }
}

4. In this example, the Message.creator method is used to create and send a new message, which includes the recipient's phone number, sender's phone number, and message body.
5. Once you run this class, the SMS message will be sent to the recipient's phone number.

Note: You will need to replace the placeholder values with your own Twilio account SID and Auth Token, as well as the recipient and sender phone numbers. You also need to verify the phone number you want to send the message from, if you haven't verified it yet.

This is just one example of how to send SMS messages in Java using the Twilio SMS gateway. There are other SMS gateways available, such as Nexmo and Clickatell, and each one will have its own set of instructions and APIs.

You may also use other libraries such as jsmpp to send sms via SMPP protocol or httpclient to send sms via http. It depends on your use case and the requirements of your application which library or gateway you choose to use.