Java - Export database tables to an excel file

Application.java

package com.javaxp;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;

@SpringBootApplication
public class Application implements CommandLineRunner {

	@Autowired
	private JdbcTemplate jdbcTemplate;

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

	public void run(String... args) throws Exception {
		// Export database table
		export("TABLE_1");
		export("TABLE_2");
	}

	public void export(String tableName) {
		writeExcelFile(tableName + ".xlsx", getData(tableName));
	}

	public void writeExcelFile(String fileName, List<Map<String, Object>> data) {
		// 10000 - the number of rows that are kept in memory until flushed out
		SXSSFWorkbook workbook = new SXSSFWorkbook(10000);
		Sheet sheet = workbook.createSheet();

		AtomicInteger rowIndex = new AtomicInteger();
		data.forEach(rowData -> {
			Row row = sheet.createRow(rowIndex.getAndIncrement());

			AtomicInteger columnIndex = new AtomicInteger();
			rowData.values().forEach(columnData -> {
				Cell cell = row.createCell(columnIndex.getAndIncrement());
				cell.setCellValue(columnData.toString());
			});
		});

		try {
			FileOutputStream out = new FileOutputStream(fileName);
			workbook.write(out);
			out.flush();
			out.close();

			// dispose of temporary files backing this workbook on disk
			workbook.dispose();
			workbook.close();

			System.out.println("File created successfully:" + fileName);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public List<Map<String, Object>> getData(String tableName) {
		String sqlQuery = "SELECT * FROM " + tableName;
		return jdbcTemplate.queryForList(sqlQuery);
	}
}