This library allows you to quickly and easily use the Twilio SendGrid Web API v3 via Java.

Version 3.X.X of this library provides full support for all Twilio SendGrid Web API v3 endpoints, including the new v3 /mail/send.

This library represents the beginning of a new path for Twilio SendGrid. We want this library to be community driven and Twilio SendGrid led. We need your help to realize this goal. To help make sure we are building the right things in the right order, we ask that you create issues and pull requests or simply upvote or comment on existing issues or pull requests.

If you need help using SendGrid, please check the Twilio SendGrid Support Help Center.

Installation
Quick Start
Usage
Use Cases
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How to Contribute
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About
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License

Installation

Prerequisites

Java 8 or 11
The Twilio SendGrid service, starting at the free level to send up to 40,000 emails for the first 30 days, then send 100 emails/day free forever or check out our pricing.

Setup Environment Variables

Update the development environment with your SENDGRID_API_KEY, for example:

Copy the sample environment file to a new file

cp .env_sample .env

Edit the new .env to add your API key
Source the .env file to set the variable in the current session

source .env

Install Package

Choose your installation method - Maven w/ Gradle (recommended), Maven or Jar file.

via Maven w/ Gradle

Add the following to your build.gradle file in the root of your project.

...
dependencies {
  ...
  implementation 'com.sendgrid:sendgrid-java:4.10.2'
}

repositories {
  mavenCentral()
}
...

via Maven

mvn install

via jar file

You can just drop the jar file in. It's a fat jar - it has all the dependencies built in.

sendgrid-java.jar

Dependencies

Java-HTTP-Client

Quick Start

Hello Email

The following is the minimum needed code to send an email with the /mail/send Helper (here is a full example):

With Mail Helper Class

import com.sendgrid.*;
import java.io.IOException;

public class Example {
  public static void main(String[] args) throws IOException {
    Email from = new Email("test@example.com");
    String subject = "Sending with Twilio SendGrid is Fun";
    Email to = new Email("test@example.com");
    Content content = new Content("text/plain", "and easy to do anywhere, even with Java");
    Mail mail = new Mail(from, subject, to, content);

    SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
    Request request = new Request();
    try {
      request.setMethod(Method.POST);
      request.setEndpoint("mail/send");
      request.setBody(mail.build());
      Response response = sg.api(request);
      System.out.println(response.getStatusCode());
      System.out.println(response.getBody());
      System.out.println(response.getHeaders());
    } catch (IOException ex) {
      throw ex;
    }
  }
}

The Mail constructor creates a personalization object for you. Here is an example of how to add to it.

Without Mail Helper Class

The following is the minimum needed code to send an email without the /mail/send Helper (here is a full example):

import com.sendgrid.*;
import java.io.IOException;

public class Example {
  public static void main(String[] args) throws IOException {
    try {
      SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
      Request request = new Request();
      request.setMethod(Method.POST);
      request.setEndpoint("mail/send");
      request.setBody("{\"personalizations\":[{\"to\":[{\"email\":\"test@example.com\"}],\"subject\":\"Sending with Twilio SendGrid is Fun\"}],\"from\":{\"email\":\"test@example.com\"},\"content\":[{\"type\":\"text/plain\",\"value\": \"and easy to do anywhere, even with Java\"}]}");
      Response response = sg.api(request);
      System.out.println(response.getStatusCode());
      System.out.println(response.getBody());
      System.out.println(response.getHeaders());
    } catch (IOException ex) {
      throw ex;
    }
  }
}

General v3 Web API Usage

import com.sendgrid.*;
import java.io.IOException;

public class Example {
  public static void main(String[] args) throws IOException {
    SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
    try {
      Request request = new Request();
      request.setMethod(Method.GET);
      request.setEndpoint("api_keys");
      Response response = sg.api(request);
      System.out.println(response.getStatusCode());
      System.out.println(response.getBody());
      System.out.println(response.getHeaders());
    } catch (IOException ex) {
      throw ex;
    }
  }
}