Java
Send GMail using REST API

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

Java
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[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // 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 = new CkHttpResponse();
    success = http.HttpJson("POST",url,json,"application/json",resp);
    if (success == false) {
        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"
    //  ]
    // }
  }
}