Java GMail: Search for Messages with Subject Containing a Word

Back to Index

Return messages matching the specified query. See https://support.google.com/mail/answer/7190?hl=en for additional information about search operators. This example searches for all emails having the whole word "ADVChina" in the subject.

Documentation: https://support.google.com/mail/answer/7190?hl=en

CURL Command

curl -X GET https://www.googleapis.com/gmail/v1/users/me/messages?q=subject:ADVChina \
    --header "Authorization: Bearer GMAIL_TOKEN"

Java Example

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;

    //  URL: https://www.googleapis.com/gmail/v1/users/me/messages?q=subject:ADVChina
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",port,bTls,bAutoReconnect);
    if (success != true) {
        System.out.println("ConnectFailReason: " + rest.get_ConnectFailReason());
        System.out.println(rest.lastErrorText());
        return;
        }

    rest.AddHeader("Authorization","Bearer GMAIL_TOKEN");

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages?q=subject:ADVChina",sbResponseBody);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    int respStatusCode = rest.get_ResponseStatusCode();
    if (respStatusCode >= 400) {
        System.out.println("Response Status Code = " + respStatusCode);
        System.out.println("Response Header:");
        System.out.println(rest.responseHeader());
        System.out.println("Response Body:");
        System.out.println(sbResponseBody.getAsString());
        return;
        }

    CkJsonObject jsonResponse = new CkJsonObject();
    jsonResponse.LoadSb(sbResponseBody);

    //  See the Online Tool for Generating JSON Parse Code
    int i;
    int count_i;

    int resultSizeEstimate = jsonResponse.IntOf("resultSizeEstimate");
    i = 0;
    count_i = jsonResponse.SizeOfArray("messages");
    while (i < count_i) {
        jsonResponse.put_I(i);
        String id = jsonResponse.stringOf("messages[i].id");
        String threadId = jsonResponse.stringOf("messages[i].threadId");
        i = i+1;
        }
  }
}

Sample JSON Response Body

{
  "messages": [
    {
      "id": "166e50fed0b9b0cb",
      "threadId": "166e50fed0b9b0cb"
    },
    {
      "id": "166c12e5fee013fe",
      "threadId": "166c12e5fee013fe"
    },
    {
      "id": "1669cc9a926bb8c1",
      "threadId": "1669cc9a926bb8c1"
    },
    {
      "id": "16678c485e7f0a0c",
      "threadId": "16678c485e7f0a0c"
    }
  ],
  "resultSizeEstimate": 4
}