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Excel Writer for a tutorial on the SSaurel's Channel
package excel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExcelWriter {
private static String[] columns = { "First Name", "Last Name", "Email",
"Date Of Birth" };
private static List<Contact> contacts = new ArrayList<Contact>();
public static void main(String[] args) throws IOException,
InvalidFormatException {
contacts.add(new Contact("Sylvain", "Saurel",
"sylvain.saurel@gmail.com", "17/01/1980"));
contacts.add(new Contact("Albert", "Dupond",
"sylvain.saurel@gmail.com", "17/08/1989"));
contacts.add(new Contact("Pierre", "Dupont",
"sylvain.saurel@gmail.com", "17/07/1956"));
contacts.add(new Contact("Mariano", "Diaz", "sylvain.saurel@gmail.com",
"17/05/1988"));
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Contacts");
Font headerFont = workbook.createFont();
headerFont.setBold(true);
headerFont.setFontHeightInPoints((short) 14);
headerFont.setColor(IndexedColors.RED.getIndex());
CellStyle headerCellStyle = workbook.createCellStyle();
headerCellStyle.setFont(headerFont);
// Create a Row
Row headerRow = sheet.createRow(0);
for (int i = 0; i < columns.length; i++) {
Cell cell = headerRow.createCell(i);
cell.setCellValue(columns[i]);
cell.setCellStyle(headerCellStyle);
}
// Create Other rows and cells with contacts data
int rowNum = 1;
for (Contact contact : contacts) {
Row row = sheet.createRow(rowNum++);
row.createCell(0).setCellValue(contact.firstName);
row.createCell(1).setCellValue(contact.lastName);
row.createCell(2).setCellValue(contact.email);
row.createCell(3).setCellValue(contact.dateOfBirth);
}
// Resize all columns to fit the content size
for (int i = 0; i < columns.length; i++) {
sheet.autoSizeColumn(i);
}
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("contacts.xlsx");
workbook.write(fileOut);
fileOut.close();
}
}
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