Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package kg12; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author C0114112 */ @WebServlet(name = "Ex12_2", urlPatterns = { "/Ex12_2" }) public class Ex12_2 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 { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { out.println("<!DOCTYPE html>"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet Ex12_2</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>???</h1>"); // multipart/form-data ?? if (ServletFileUpload.isMultipartContent(request)) { out.println("???<br>"); } else { out.println("?????<br>"); out.close(); return; } // ServletFileUpload?? DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload sfu = new ServletFileUpload(factory); // ??? int fileSizeMax = 1024000; factory.setSizeThreshold(1024); sfu.setSizeMax(fileSizeMax); sfu.setHeaderEncoding("UTF-8"); // ? String format = "%s:%s<br>%n"; // ??????? FileItemIterator fileIt = sfu.getItemIterator(request); while (fileIt.hasNext()) { FileItemStream item = fileIt.next(); if (item.isFormField()) { // out.print("<br>??<br>"); out.printf(format, "??", item.getFieldName()); InputStream is = item.openStream(); // ? byte ?? byte[] b = new byte[255]; // byte? b ???? is.read(b, 0, b.length); // byte? b ? "UTF-8" ??String??? result ? String result = new String(b, "UTF-8"); out.printf(format, "", result); } else { // out.print("<br>??<br>"); out.printf(format, "??", item.getName()); InputStream is = item.openStream(); String fileName = item.getName(); int len = 0; byte[] buffer = new byte[fileSizeMax]; FileOutputStream fos = new FileOutputStream( "D:\\NetBeansProjects\\ap2_www\\web\\kg12\\" + fileName); try { while ((len = is.read(buffer)) > 0) { fos.write(buffer, 0, len); } } finally { fos.close(); } } } out.println("</body>"); out.println("</html>"); } catch (FileUploadException e) { out.println(e + "<br>"); throw new ServletException(e); } catch (Exception e) { out.println(e + "<br>"); throw new ServletException(e); } finally { out.close(); } } // <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> }