Java

Get GMail Message Metadata

See more GMail REST API Examples

Demonstrates how to get the metadata for each message in a list of message IDs. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Http;
import com.chilkatsoft.chilkat2.HttpResponse;
import com.chilkatsoft.chilkat2.JsonObject;

public class ChilkatExample {

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

        Http http = new Http();

        http.setAuthToken("ACCESS_TOKEN");

        http.setAccept("application/json");

        // Let's say we have the following JSON containing a list of message ID's

        // {
        //   "messages": [
        //     {
        //       "id": "1712bc1dc22da2a2",
        //       "threadId": "1712bc1dc22da2a2"
        //     },
        //     {
        //       "id": "1712b94fa2168040",
        //       "threadId": "1712b94fa2168040"
        //     },
        //     {
        //       "id": "1711e4bd96ded05e",
        //       "threadId": "1711e4bd96ded05e"
        //     },
        //     {
        //       "id": "1711de0d119e751e",
        //       "threadId": "1711de0d119e751e"
        //     },
        //     {
        //       "id": "1711c81a43050f59",
        //       "threadId": "1711c81a43050f59"
        //     },
        //     {
        //       "id": "1711c2c1516abce5",
        //       "threadId": "1711c2c1516abce5"
        //     },
        //     {
        //       "id": "1711c161e655c915",
        //       "threadId": "1711c161e655c915"
        //     },
        //     {
        //       "id": "171199c6e454558c",
        //       "threadId": "171199c6e454558c"
        //     },
        //     {
        //       "id": "17119474c8aa248e",
        //       "threadId": "17119474c8aa248e"
        //     }
        //   ],
        //   "nextPageToken": "16710921492249671162",
        //   "resultSizeEstimate": 309
        // }

        // Normally your program would have the above JSON in a string variable (obtained from a previous call to get
        // a list of message IDs from a GMail mailbox).  In this example, we'll load the JSON from a file.
        JsonObject jsonMsgIds = new JsonObject();
        jsonMsgIds.loadFile("qa_data/json/gmail_message_ids.json");

        HttpResponse resp = new HttpResponse();

        String id = "";
        int i = 0;
        int count_i = jsonMsgIds.sizeOfArray("messages");
        while (i < count_i) {
            jsonMsgIds.setI(i);
            id = jsonMsgIds.stringOf("messages[i].id");

            // Get the metadata for this message ID.
            http.setUrlVar("id", id);

            try {
                http.httpNoBody("GET", "https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata", resp);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
                return;
            }

            System.out.println("Response Status Code: " + resp.getStatusCode());

            JsonObject jsonResponse = new JsonObject();
            jsonResponse.load(resp.getBodyStr());
            jsonResponse.setEmitCompact(false);
            System.out.println(jsonResponse.emit());

            if (resp.getStatusCode() != 200) {
                System.out.println("Failed.");
                return;
            }

            i = i + 1;
        }

        // Use this online tool to generate parsing code from sample JSON:
        // Generate Parsing Code from JSON
    }
}