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Server-side integration for the FormKiQ ios application
There is a newer version: 0.6.1
package com.formkiq.server.service;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import com.formkiq.server.service.dto.FormJSON;
import com.formkiq.server.service.dto.FormJSONField;
import com.formkiq.server.service.dto.FormJSONSection;

/**
 * Implementation of Export Service.
 *
 */
@Service
public class ExportServiceImpl implements ExportService {

    @Override
    public void writeToXLS(final FormJSON form, final OutputStream os)
            throws IOException {

        Workbook wb = new HSSFWorkbook();
        try {
            writeToExcel(os, form, wb);
        } finally {
            wb.close();
        }
    }

    @Override
    public void writeToXLSX(final FormJSON form, final OutputStream os)
            throws IOException {

        Workbook wb = new XSSFWorkbook();
        try {
            writeToExcel(os, form, wb);
        } finally {
            wb.close();
        }
    }

    /**
     * Writes to Excel.
     * @param os OutputStream
     * @param form FormJSON
     * @param wb Workbook
     * @throws IOException IOException
     */
    private void writeToExcel(final OutputStream os, final FormJSON form,
            final Workbook wb) throws IOException {

        int count = 1;
        for (FormJSONSection section : form.getSections()) {

            String title = getSectionTitle(section, count);

            Sheet sheet = wb.createSheet(title);

            // header row
            Row headerRow = sheet.createRow(0);

            int column = 0;
            for (FormJSONField field : section.getFields()) {
                Cell cell = headerRow.createCell(column);
                cell.setCellValue(field.getLabel());
                column++;
            }

            column = 0;
            Row dataRow = sheet.createRow(1);
            for (FormJSONField field : section.getFields()) {
                Cell cell = dataRow.createCell(column);
                cell.setCellValue(field.getValue());
                column++;
            }

            count++;
        }

        wb.write(os);
    }

    /**
     * Gets Section Title.
     * @param section FormJSONSection
     * @param count int
     * @return {@link String}
     */
    private String getSectionTitle(final FormJSONSection section,
            final int count) {

        String title = !StringUtils.isEmpty(section.getTitle()) ? section
                .getTitle() : "sheet " + count;

        return title;
    }
}