(Java) Send GMail using REST API

See more GMail REST API Examples

Demonstrates how to send an email using the GMail REST API.

Chilkat Java Downloads

Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    boolean success;

    // Use the Chilkat Email API to create or load an email.
    CkEmail email = new CkEmail();

    // The From name/address don't need to be specified. 
    // GMail will automatically use your Gmail address if the following 2 lines are omitted.
    email.put_FromName("My Name");
    email.put_FromAddress("my_account_name@gmail.com");

    email.AddTo("John Smith","somebody@somewhere.com");
    // To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

    email.put_Subject("This is a test GMail email created using Chilkat.");
    email.put_Charset("utf-8");
    email.AddPlainTextAlternativeBody("This is a test");

    // Create an HTML email body with an embedded image.
    String cid = email.addRelatedFile("qa_data/jpg/starfish.jpg");
    CkStringBuilder sbHtml = new CkStringBuilder();
    sbHtml.Append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>");
    int numReplacements = sbHtml.Replace("STARFISH_CID",cid);

    email.AddHtmlAlternativeBody(sbHtml.getAsString());

    // OK.. we now have an HTML email with an embedded JPG image
    // We'll need to get the full MIME of the email encoded to a base64url string.
    CkStringBuilder sbMime = new CkStringBuilder();
    email.GetMimeSb(sbMime);
    sbMime.Encode("base64url","utf-8");

    // The body of the HTTP request will be JSON..
    CkJsonObject json = new CkJsonObject();
    json.UpdateSb("raw",sbMime);

    // Send the email...
    CkHttp http = new CkHttp();
    http.put_AuthToken("GMAIL-ACCESS-TOKEN");

    String url = "https://www.googleapis.com/gmail/v1/users/me/messages/send";
    CkHttpResponse resp = http.PostJson3(url,"application/json",json);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    // A status code of 200 indicates success.
    System.out.println("Response status code: " + resp.get_StatusCode());
    System.out.println("Response body:");
    System.out.println(resp.bodyStr());

    // The response body contains JSON.
    // Use the online tool at Generate JSON Parsing Code
    // to generate JSON parsing code.

    // A sample successful JSON response:

    // {
    //  "id": "166f0d4ac39e50bf",
    //  "threadId": "166f0d4ac39e50bf",
    //  "labelIds": [
    //   "SENT"
    //  ]
    // }
  }
}