| 1 | package web.servlets;
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| 2 |
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| 3 |
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| 4 | import java.io.File;
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| 5 | import java.io.FileInputStream;
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| 6 | import java.io.IOException;
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| 7 | import java.io.InputStream;
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| 8 | import java.io.PrintWriter;
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| 9 |
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| 10 | import javax.servlet.ServletException;
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| 11 | import javax.servlet.ServletOutputStream;
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| 12 | import javax.servlet.http.HttpServlet;
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| 13 | import javax.servlet.http.HttpServletRequest;
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| 14 | import javax.servlet.http.HttpServletResponse;
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| 15 |
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| 16 | /**
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| 17 | * @author University of Waikato - Te Whare WÄnanga o Waikato
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| 18 | * @version 1.0
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| 19 | * @since 2014-11-20
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| 20 | */
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| 21 | public class Download extends HttpServlet {
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| 22 |
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| 23 | /**
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| 24 | * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
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| 25 | * @param request servlet request
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| 26 | * @param response servlet response
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| 27 | * @throws ServletException if a servlet-specific error occurs
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| 28 | * @throws IOException if an I/O error occurs
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| 29 | */
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| 30 | protected void processRequest(HttpServletRequest request, HttpServletResponse response)
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| 31 | throws ServletException, IOException {
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| 32 | response.setContentType("text/html;charset=UTF-8");
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| 33 | PrintWriter out = response.getWriter();
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| 34 | try {
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| 35 | out.println("<html>");
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| 36 | out.println("<head>");
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| 37 | out.println("<title>Servlet DownloadServlet</title>");
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| 38 | out.println("</head>");
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| 39 | out.println("<body>");
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| 40 | out.println("<h1>It appears you have accessed a place you shouldn't have.</h1>");
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| 41 | out.println("</body>");
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| 42 | out.println("</html>");
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| 43 | } finally {
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| 44 | out.close();
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
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| 49 | /**
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| 50 | * Handles the HTTP <code>GET</code> method.
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| 51 | * @param request servlet request
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| 52 | * @param response servlet response
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| 53 | * @throws ServletException if a servlet-specific error occurs
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| 54 | * @throws IOException if an I/O error occurs
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| 55 | */
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| 56 | @Override
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| 57 | protected void doGet(HttpServletRequest request, HttpServletResponse response)
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| 58 | throws ServletException, IOException {
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| 59 | processRequest(request, response);
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| 60 | }
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| 61 |
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| 62 | /**
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| 63 | * Handles the HTTP <code>POST</code> method.
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| 64 | * @param request servlet request
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| 65 | * @param response servlet response
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| 66 | * @throws ServletException if a servlet-specific error occurs
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| 67 | * @throws IOException if an I/O error occurs
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| 68 | */
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| 69 | @Override
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| 70 | protected void doPost(HttpServletRequest request, HttpServletResponse response)
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| 71 | throws ServletException, IOException {
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| 72 | File file = new File(request.getParameter("filepath"));
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| 73 | ServletOutputStream out = null;
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| 74 | InputStream in = null;
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| 75 | try {
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| 76 | response.setContentType("application/x-download");
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| 77 | response.setHeader("Content-Disposition", "attachment; filename=" + request.getParameter("filename"));
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| 78 | out = response.getOutputStream();
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| 79 | in = new FileInputStream(file);
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| 80 | byte[] bytes = new byte[1 * 1024 * 1024];
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| 81 | int bytesRead;
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| 82 | while ((bytesRead = in.read(bytes)) != -1) {
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| 83 | out.write(bytes, 0, bytesRead);
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| 84 | }
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| 85 | } catch (Exception e) {
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| 86 | e.printStackTrace();
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| 87 | } finally {
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| 88 | out.close();
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| 89 | in.close();
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| 90 | }
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| 91 | }
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| 92 |
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| 93 | /**
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| 94 | * Returns a short description of the servlet.
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| 95 | * @return a String containing servlet description
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| 96 | */
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| 97 | @Override
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| 98 | public String getServletInfo() {
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| 99 | return "Short description";
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| 100 | }// </editor-fold>
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| 101 | }
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