com.crunchify.jsp.servlet.HSSFCreate.java Source code

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Here is the source code for com.crunchify.jsp.servlet.HSSFCreate.java

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/*
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package com.crunchify.jsp.servlet;

import edu.co.sergio.mundo.dao.DepartamentoDAO;
import java.io.*;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

public class HSSFCreate extends HttpServlet {

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    public void destroy() {
    }

    /**
     * Processes requests for both HTTP GET and POST methods.
     *
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        DepartamentoDAO d = new DepartamentoDAO();

        response.setContentType("application/vnd.ms-excel");
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("new sheet");

        Map<String, Object[]> data = new HashMap<String, Object[]>();

        data.put("1", new Object[] { "Emp No.", "Name" });
        for (int i = 0; i < d.findAll().size(); i++) {
            data.put("2", new Object[] { d.findAll().get(i).getNom_departamento(),
                    d.findAll().get(i).getNom_departamento() });
        }

        Set<String> keyset = data.keySet();
        int rownum = 0;
        for (String key : keyset) {
            Row row = sheet.createRow(rownum++);
            Object[] objArr = data.get(key);
            int cellnum = 0;
            for (Object obj : objArr) {
                Cell cell = row.createCell(cellnum++);
                if (obj instanceof Date) {
                    cell.setCellValue((Date) 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);
                }
            }
        }

        // Write the output 
        OutputStream out = response.getOutputStream();
        wb.write(out);
        out.close();
    }

    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP POST method.
     *
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Example to create a workbook in a servlet using HSSF";
    }
}