[Training Video - 6] [File Reading] [Java] Create and Write Excel File Using Apache POI API

package com.file.properties;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;

public class CreateNewExcel {
		static void createExcelFile(File createFile,String sheetName, Map<String, Object[]> data) {	

		HSSFWorkbook workbook = new HSSFWorkbook();
		HSSFSheet sheet = workbook.createSheet(sheetName);

		Set<String> keySet=data.keySet();
		List<String> keyList=new ArrayList<String>(keySet);
		Collections.sort(keyList);

		int rownum = 0;
		for (String key : keyList) {
			Row row = sheet.createRow(rownum++);
			Object[] objArr = (Object[]) data.get(key);
			int cellnum = 0;
			for (Object obj : objArr) {
				Cell cell = row.createCell(cellnum++);
				if(obj instanceof Date)
					cell.setCellValue((RichTextString)obj);
				else if(obj instanceof Boolean)
					cell.setCellValue((Boolean)obj);
				else if(obj instanceof String)
					cell.setCellValue((String)obj);
				else if(obj instanceof Double)
					cell.setCellValue((Double)obj);
			}
		}

		try {
			FileOutputStream out = new FileOutputStream(createFile);
			workbook.write(out);
			out.close();
			System.out.println("Excel written successfully..");

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		File createFile = new File("D:\\SoapUIStudy\\createExcelFile.xls");
		String sheetName = "Sample sheet";
		Map<String, Object[]> data = new HashMap<String, Object[]>();
		data.put("1", new Object[] {"Emp No.", "Name", "Salary"});
		data.put("2", new Object[] {1d, "John", 1500000d});
		data.put("3", new Object[] {2d, "Sam", 800000d});
		data.put("4", new Object[] {3d, "Dean", 700000d});
		createExcelFile(createFile,sheetName,data);
	}

}

Result :