In this post, you will learn about integrating your Spring Boot & Java app with SendGrid Web API. The following are some of the points covered:
echo "export SENDGRID_API_KEY='Paste_Your_API_Key'" > sendgrid.env echo "sendgrid.env" >> .gitignore source ./sendgrid.env
import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import com.sendgrid.SendGrid; @Configuration @PropertySource("classpath:application.properties") public class SendGridConfig { @Value("${sendgrid.api.key}") String sendGridAPIKey; return new SendGrid(sendGridAPIKey); } }
In the above code sample, the SendGrid API Key is read from application.properties file. The following is the content of application.properties file.
sendgrid.api.key = ABCcvbdTYDRS_ksjdhIUYICS.-836jksjsdhYTkPt12hdgsT-whdk ahdjfpT3shdBCVNS
Make sure that you put API key and not API Key Id. Or, else, you would get the exception such as SendGrid API Key not working. “The provided authorization grant is invalid, expired or revoked”.
Get the latest SendGrid Java dependency from Maven SendGrid Java page.
<!-- https://mvnrepository.com/artifact/com.sendgrid/sendgrid-java --> <dependency> <groupId>com.sendgrid</groupId> <artifactId>sendgrid-java</artifactId> <version>4.1.2</version> </dependency>
The following represents the implementation for SendGrid APIs. Pay attention to some of the following:
@Service public class SendGridEmailService implements EmailService { private SendGrid sendGridClient; @Autowired public SendGridEmailService(SendGrid sendGridClient) { this.sendGridClient = sendGridClient; } @Override public void sendText(String from, String to, String subject, String body) { Response response = sendEmail(from, to, subject, new Content("text/plain", body)); System.out.println("Status Code: " + response.getStatusCode() + ", Body: " + response.getBody() + ", Headers: " + response.getHeaders()); } @Override public void sendHTML(String from, String to, String subject, String body) { Response response = sendEmail(from, to, subject, new Content("text/html", body)); System.out.println("Status Code: " + response.getStatusCode() + ", Body: " + response.getBody() + ", Headers: " + response.getHeaders()); } private Response sendEmail(String from, String to, String subject, Content content) { Mail mail = new Mail(new Email(from), subject, new Email(to), content); mail.setReplyTo(new Email("abc@gmail.com")); Request request = new Request(); Response response = null; try { request.setMethod(Method.POST); request.setEndpoint("mail/send"); request.setBody(mail.build()); this.sendGridClient.api(request); } catch (IOException ex) { System.out.println(ex.getMessage()); } return response; } }
The above class implements the following custom Email Service interface:
public interface EmailService { void sendText(String from, String to, String subject, String body); void sendHTML(String from, String to, String subject, String body); }
The following is the sample Spring Boot code which can be used to invoke the custom SendGrid email implementation created in above example.
@SpringBootApplication public class RecruiterbotApplication implements CommandLineRunner { @Autowired EmailService sendGridEmailService; public static void main(String[] args) { SpringApplication app = new SpringApplication(RecruiterbotApplication.class); app.run(args); } @Override public void run(String... arg0) throws IOException, URISyntaxException { this.sendGridEmailService.sendHTML("abc@gmail.com", "efg@gmail.com", "Hello World", "Hello, <strong>how are you doing?</strong>"); } }
In this post, you learned about how to integrate your Spring Boot application using SendGrid Java Web APIs.
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