Java GMail: Get a specific message (format="metadata")

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Gets a specific message using format=metadata.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

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[])
  {
    CkRest rest = new CkRest();
    boolean success;

    //   Provide a previously obtained OAuth2 access token.
    CkOAuth2 oauth2 = new CkOAuth2();
    oauth2.put_AccessToken("OAUTH2_ACCESS_TOKEN");
    rest.SetAuthOAuth2(oauth2);

    success = rest.Connect("www.googleapis.com",443,true,true);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    rest.AddPathParam("messageId","15fc23688c553739");

    rest.AddQueryParam("format","metadata");

    CkStringBuilder sbJson = new CkStringBuilder();
    success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages/messageId",sbJson);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    if (rest.get_ResponseStatusCode() != 200) {
        System.out.println("Received error response code: " + rest.get_ResponseStatusCode());
        System.out.println("Response body:");
        System.out.println(sbJson.getAsString());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    json.LoadSb(sbJson);

    //  The following code parses the JSON response.
    //  A sample JSON response is shown below the sample code.
    String id;
    String threadId;
    String snippet;
    String historyId;
    String internalDate;
    String payloadMimeType;
    int sizeEstimate;
    int i;
    int count_i;
    String strVal;
    String name;
    String value;

    id = json.stringOf("id");
    threadId = json.stringOf("threadId");
    snippet = json.stringOf("snippet");
    historyId = json.stringOf("historyId");
    internalDate = json.stringOf("internalDate");
    payloadMimeType = json.stringOf("payload.mimeType");
    sizeEstimate = json.IntOf("sizeEstimate");
    i = 0;
    count_i = json.SizeOfArray("labelIds");
    while (i < count_i) {
        json.put_I(i);
        strVal = json.stringOf("labelIds[i]");
        i = i+1;
        }

    i = 0;
    count_i = json.SizeOfArray("payload.headers");
    while (i < count_i) {
        json.put_I(i);
        name = json.stringOf("payload.headers[i].name");
        value = json.stringOf("payload.headers[i].value");
        i = i+1;
        }

    System.out.println("Example Completed.");
  }
}

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "mimeType": "multipart/mixed",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ]
  },
  "sizeEstimate": 11716
}