Convert Excel Files to Google Sheets in Java

readme.md

Read the complete article on how to convert Excel files to Google Sheets in Java: https://blog.aspose.com/2022/02/01/convert-excel-files-to-google-sheets-in-java/

addSheet.java

private static void addSheet(Sheets _service, String _spreadSheetID, String _sheetName) {
	try {
		// Add new Sheet
		AddSheetRequest addSheetRequest = new AddSheetRequest();
		addSheetRequest.setProperties(new SheetProperties());
		addSheetRequest.getProperties().setTitle(_sheetName);

		// Create update request
		BatchUpdateSpreadsheetRequest batchUpdateSpreadsheetRequest = new BatchUpdateSpreadsheetRequest();
		Request req = new Request();
		req.setAddSheet(addSheetRequest);
		batchUpdateSpreadsheetRequest.setRequests(new ArrayList<Request>());
		batchUpdateSpreadsheetRequest.getRequests().add(req);

		// Execute request
		_service.spreadsheets().batchUpdate(_spreadSheetID, batchUpdateSpreadsheetRequest).execute();
	} catch (Exception e) {
		System.out.println("Error in creating sheet: " + e.getMessage());
	}
}

ConvertExcelToGoogleSheets.java

package excel_to_google_sheets;

import com.aspose.cells.Workbook;
import com.aspose.cells.Worksheet;
import com.aspose.cells.WorksheetCollection;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.sheets.v4.Sheets;
import com.google.api.services.sheets.v4.SheetsScopes;
import com.google.api.services.sheets.v4.model.AddSheetRequest;
import com.google.api.services.sheets.v4.model.BatchUpdateSpreadsheetRequest;
import com.google.api.services.sheets.v4.model.Request;
import com.google.api.services.sheets.v4.model.Sheet;
import com.google.api.services.sheets.v4.model.SheetProperties;
import com.google.api.services.sheets.v4.model.Spreadsheet;
import com.google.api.services.sheets.v4.model.SpreadsheetProperties;
import com.google.api.services.sheets.v4.model.UpdateValuesResponse;
import com.google.api.services.sheets.v4.model.ValueRange;
import java.awt.Desktop;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ExportExcelToGoogle {

	/**
	 * Global instance of the scopes required. If modifying these scopes, delete
	 * your previously saved tokens/ folder.
	 */
	private static final String APPLICATION_NAME = "Google Sheets API Java Quickstart";
	private static final JsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();
	private static final String TOKENS_DIRECTORY_PATH = "tokens";
	private static final List<String> SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS);

	public static void main(String[] args) throws Exception {		
		// Export Excel data to Google Sheets
		exportExcelToGoogle("workbook.xlsx");
	}

	private static void exportExcelToGoogle(String _excelFileName) {
		try {
			// Build a new authorized API client service.
			final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
			
			Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
					.setApplicationName(APPLICATION_NAME).build();
			
			// Load an Excel workbook
			Workbook wb = new Workbook(_excelFileName);
			
			// Get name of the first worksheet
			String defaultWorksheetName = wb.getWorksheets().get(0).getName().trim();
			
			// Get all worksheets
			WorksheetCollection collection = wb.getWorksheets();
	
			// Create a new Google spreadsheet with default worksheet
			Spreadsheet spreadsheet = createSpreadsheet(service, wb.getFileName(), defaultWorksheetName);
	
			String range;
	
			// Loop through worksheets
			for (int worksheetIndex = 0; worksheetIndex < collection.getCount(); worksheetIndex++) {
				// Get reference of the worksheet
				Worksheet ws = collection.get(worksheetIndex);
	
				if (worksheetIndex == 0) {
					// First sheet is created by default, so only set range
					range = defaultWorksheetName + "!A:Y";
				} else {
					// Add a new sheet
					addSheet(service, spreadsheet.getSpreadsheetId(), ws.getName().trim());
					range = ws.getName().trim() + "!A:Y";
				}
	
				// Get number of rows and columns
				int rows = ws.getCells().getMaxDataRow();
				int cols = ws.getCells().getMaxDataColumn();
	
				List<List<Object>> worksheetData = new ArrayList<List<Object>>();
	
				// Loop through rows
				for (int i = 0; i <= rows; i++) {
					List<Object> rowData = new ArrayList<Object>();
	
					// Loop through each column in selected row
					for (int j = 0; j <= cols; j++) {
						if (ws.getCells().get(i, j).getValue() == null)
							rowData.add("");
						else
							rowData.add(ws.getCells().get(i, j).getValue());
					}
	
					// Add to worksheet data
					worksheetData.add(rowData);
				}
	
				// Set range
				ValueRange body = new ValueRange();
				body.setRange(range);
	
				// Set values
				body.setValues(worksheetData);
	
				// Export values to Google Sheets
				UpdateValuesResponse result = service.spreadsheets().values()
						.update(spreadsheet.getSpreadsheetId(), range, body).setValueInputOption("USER_ENTERED")
						.execute();
				
				// Print output
				System.out.printf("%d cells updated.", result.getUpdatedCells());
	
			}
	
			// Open Google spreadsheet in browser
			Desktop desk = Desktop.getDesktop();
			desk.browse(new URI("https://docs.google.com/spreadsheets/d/" + spreadsheet.getSpreadsheetId()));
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	private static Spreadsheet createSpreadsheet(Sheets _service, String spreadsheetName, String _defaultSheetName)
			throws IOException {
		// Create a new spreadsheet
		Spreadsheet spreadsheet = new Spreadsheet()
				.setProperties(new SpreadsheetProperties().setTitle(spreadsheetName));
	
		// Create a new sheet
		Sheet sheet = new Sheet();
		sheet.setProperties(new SheetProperties());
		sheet.getProperties().setTitle(_defaultSheetName);
	
		// Add sheet to list
		List<Sheet> sheetList = new ArrayList<Sheet>();
		sheetList.add(sheet);
		spreadsheet.setSheets(sheetList);
	
		// Execute request
		spreadsheet = _service.spreadsheets().create(spreadsheet).setFields("spreadsheetId").execute();
		System.out.println("Spreadsheet ID: " + spreadsheet.getSpreadsheetId());
	
		return spreadsheet;
	}

	private static void addSheet(Sheets _service, String _spreadSheetID, String _sheetName) {
		try {
			// Add new Sheet
			AddSheetRequest addSheetRequest = new AddSheetRequest();
			addSheetRequest.setProperties(new SheetProperties());
			addSheetRequest.getProperties().setTitle(_sheetName);
	
			// Create update request
			BatchUpdateSpreadsheetRequest batchUpdateSpreadsheetRequest = new BatchUpdateSpreadsheetRequest();
			Request req = new Request();
			req.setAddSheet(addSheetRequest);
			batchUpdateSpreadsheetRequest.setRequests(new ArrayList<Request>());
			batchUpdateSpreadsheetRequest.getRequests().add(req);
	
			// Execute request
			_service.spreadsheets().batchUpdate(_spreadSheetID, batchUpdateSpreadsheetRequest).execute();
		} catch (Exception e) {
			System.out.println("Error in creating sheet: " + e.getMessage());
		}
	}

	private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
		// Load client secrets
		InputStream in = new FileInputStream(new File("credentials.json"));
		GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
	
		// Build flow and trigger user authorization request
		GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
				clientSecrets, SCOPES)
						.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
						.setAccessType("offline").build();
		LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
		return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
	}
}

createNewSpreadsheet.java

// Create a new Google spreadsheet with default worksheet
Spreadsheet spreadsheet = createSpreadsheet(service, wb.getFileName(), defaultWorksheetName);

createSpreadsheet.java

private static Spreadsheet createSpreadsheet(Sheets _service, String spreadsheetName, String _defaultSheetName)
		throws IOException {
	// Create a new spreadsheet
	Spreadsheet spreadsheet = new Spreadsheet()
			.setProperties(new SpreadsheetProperties().setTitle(spreadsheetName));

	// Create a new sheet
	Sheet sheet = new Sheet();
	sheet.setProperties(new SheetProperties());
	sheet.getProperties().setTitle(_defaultSheetName);

	// Add sheet to list
	List<Sheet> sheetList = new ArrayList<Sheet>();
	sheetList.add(sheet);
	spreadsheet.setSheets(sheetList);

	// Execute request
	spreadsheet = _service.spreadsheets().create(spreadsheet).setFields("spreadsheetId").execute();
	System.out.println("Spreadsheet ID: " + spreadsheet.getSpreadsheetId());

	return spreadsheet;
}

exportExcelToGoogle.java

private static void exportExcelToGoogle(String _excelFileName) {
	try {
		// Build a new authorized API client service.
		final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
		
		Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
				.setApplicationName(APPLICATION_NAME).build();
		
		// Load an Excel workbook
		Workbook wb = new Workbook(_excelFileName);
		
		// Get name of the first worksheet
		String defaultWorksheetName = wb.getWorksheets().get(0).getName().trim();
		
		// Get all worksheets
		WorksheetCollection collection = wb.getWorksheets();

		// Create a new Google spreadsheet with default worksheet
		Spreadsheet spreadsheet = createSpreadsheet(service, wb.getFileName(), defaultWorksheetName);

		System.out.println("Spreadsheet URL: " + spreadsheet.getSpreadsheetUrl());
		System.out.println("ID: " + spreadsheet.getSpreadsheetId());

		String range;

		// Loop through worksheets
		for (int worksheetIndex = 0; worksheetIndex < collection.getCount(); worksheetIndex++) {
			// Get reference of the worksheet
			Worksheet ws = collection.get(worksheetIndex);

			if (worksheetIndex == 0) {
				// First sheet is created by default, so only set range
				range = defaultWorksheetName + "!A:Y";
			} else {
				// Add a new sheet
				addSheet(service, spreadsheet.getSpreadsheetId(), ws.getName().trim());
				range = ws.getName().trim() + "!A:Y";
			}

			// Get number of rows and columns
			int rows = ws.getCells().getMaxDataRow();
			int cols = ws.getCells().getMaxDataColumn();

			List<List<Object>> worksheetData = new ArrayList<List<Object>>();

			// Loop through rows
			for (int i = 0; i <= rows; i++) {
				List<Object> rowData = new ArrayList<Object>();

				// Loop through each column in selected row
				for (int j = 0; j <= cols; j++) {
					if (ws.getCells().get(i, j).getValue() == null)
						rowData.add("");
					else
						rowData.add(ws.getCells().get(i, j).getValue());
				}

				// Add to worksheet data
				worksheetData.add(rowData);
			}

			// Set range
			ValueRange body = new ValueRange();
			body.setRange(range);

			// Set values
			body.setValues(worksheetData);

			// Export values to Google Sheets
			UpdateValuesResponse result = service.spreadsheets().values()
					.update(spreadsheet.getSpreadsheetId(), range, body).setValueInputOption("USER_ENTERED")
					.execute();
			
			// Print output
			System.out.printf("%d cells updated.", result.getUpdatedCells());

		}

		// Open Google spreadsheet in browser
		Desktop desk = Desktop.getDesktop();
		desk.browse(new URI("https://docs.google.com/spreadsheets/d/" + spreadsheet.getSpreadsheetId()));
	} catch (Exception e) {
		System.out.println(e.getMessage());
	}
}

getCredentials.java

private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
	// Load client secrets
	InputStream in = new FileInputStream(new File("credentials.json"));
	GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

	// Build flow and trigger user authorization request
	GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY,
			clientSecrets, SCOPES)
					.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
					.setAccessType("offline").build();
	LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8888).build();
	return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
}

loadExcelFile.java

// Load an Excel workbook
Workbook wb = new Workbook(_excelFileName);

// Get name of the first worksheet
String defaultWorksheetName = wb.getWorksheets().get(0).getName().trim();

// Get all worksheets
WorksheetCollection collection = wb.getWorksheets();

readExcelFile.java

String range;

// Loop through worksheets
for (int worksheetIndex = 0; worksheetIndex < collection.getCount(); worksheetIndex++) {
	// Get reference of the worksheet
	Worksheet ws = collection.get(worksheetIndex);

	if (worksheetIndex == 0) {
		// First sheet is created by default, so only set range
		range = defaultWorksheetName + "!A:Y";
	} else {
		// Add a new sheet
		addSheet(service, spreadsheet.getSpreadsheetId(), ws.getName().trim());
		range = ws.getName().trim() + "!A:Y";
	}

	// Get number of rows and columns
	int rows = ws.getCells().getMaxDataRow();
	int cols = ws.getCells().getMaxDataColumn();

	List<List<Object>> worksheetData = new ArrayList<List<Object>>();

	// Loop through rows
	for (int i = 0; i <= rows; i++) {
		List<Object> rowData = new ArrayList<Object>();

		// Loop through each column in selected row
		for (int j = 0; j <= cols; j++) {
			if (ws.getCells().get(i, j).getValue() == null)
				rowData.add("");
			else
				rowData.add(ws.getCells().get(i, j).getValue());
		}

		// Add to worksheet data
		worksheetData.add(rowData);
	}
  
  // TO-DO: Execute request to post data to Google Sheets 
}

startService.java

// Build a new authorized API client service.
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();

Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
		.setApplicationName(APPLICATION_NAME).build();

variables.java

/**
 * Global instance of the scopes required. If modifying these scopes, delete
 * your previously saved tokens/ folder.
 */
private static final String APPLICATION_NAME = "Google Sheets API Java Quickstart";
private static final JsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();
private static final String TOKENS_DIRECTORY_PATH = "tokens";
private static final List<String> SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS);

writeToGoogleSheets.java

// Set range
ValueRange body = new ValueRange();
body.setRange(range);

// Set values
body.setValues(worksheetData);

// Export values to Google Sheets
UpdateValuesResponse result = service.spreadsheets().values()
		.update(spreadsheet.getSpreadsheetId(), range, body).setValueInputOption("USER_ENTERED")
		.execute();

// Print output
System.out.printf("%d cells updated.", result.getUpdatedCells());