edu.jhu.jmontan.hw5.CostAsExcelServlet.java Source code

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Here is the source code for edu.jhu.jmontan.hw5.CostAsExcelServlet.java

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/*
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package edu.jhu.jmontan.hw5;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

/**
 *
 * @author montana
 */
public class CostAsExcelServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();
        LineItemReceipt receipt = (LineItemReceipt) session.getAttribute("receipt");
        response.setHeader("content-disposition", "attachment; filename=hopkinscost.xls");
        response.setHeader("cache-control", "no-cache");
        try (OutputStream out = response.getOutputStream()) {
            int rowNum = 0;
            Workbook workbook = new HSSFWorkbook();
            Sheet sheet = workbook.createSheet("Conference Cost");
            Row row = sheet.createRow(rowNum);
            row.createCell(0).setCellValue("Course");
            row.createCell(1).setCellValue("Cost");

            rowNum++;

            for (LineItem lineItem : receipt.getLineItems()) {
                int cost = lineItem.getCost();
                String name = lineItem.getName();
                row = sheet.createRow(rowNum);
                row.createCell(0).setCellValue(name);
                row.createCell(1).setCellValue(cost);
                rowNum++;
            }

            row = sheet.createRow(rowNum);
            row.createCell(0).setCellValue("Total");
            row.createCell(1).setCellValue(receipt.getTotal());

            workbook.write(out);
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}