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 servletServices; import control.studentControl; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Iterator; import java.util.List; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author Carlos */ @WebServlet(name = "serviceFile", urlPatterns = { "/serviceFile" }) public class serviceFile 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(); int pkStudent = 0; if (session.getAttribute("pkStudent") != null) { pkStudent = Integer.parseInt(session.getAttribute("pkStudent").toString()); } if (request.getParameter("update") != null) { String field_name = request.getParameter("update"); String field_value; try (PrintWriter out = response.getWriter()) { if (session.getAttribute("pkStudent") != null) { File file; int maxFileSize = 5000 * 1024 * 50; int maxMemSize = 5000 * 1024 * 50; // Verify the content type String contentType = request.getContentType(); if ((contentType.contains("multipart/form-data"))) { DiskFileItemFactory factory = new DiskFileItemFactory(); // maximum size that will be stored in memory factory.setSizeThreshold(maxMemSize); // Location to save data that is larger than maxMemSize. // Path String enrollment = session.getAttribute("enrollmentStudent").toString(); String path = "C:/temp/" + enrollment; File filePath = new File(path); if (filePath.exists()) { factory.setRepository(filePath); } else { filePath.mkdirs(); factory.setRepository(filePath); } // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // maximum file size to be uploaded. upload.setSizeMax(maxFileSize); try { // Parse the request to get file items. List fileItems = upload.parseRequest(request); // Process the uploaded file items Iterator i = fileItems.iterator(); while (i.hasNext()) { FileItem fi = (FileItem) i.next(); if (!fi.isFormField()) { // Get the uploaded file parameters String fieldName = fi.getFieldName(); String fileName = fi.getName(); boolean isInMemory = fi.isInMemory(); long sizeInBytes = fi.getSize(); // Write the file if (sizeInBytes <= 1048576) { field_value = field_name.replace("fl_", ""); if (fileName.lastIndexOf("\\") >= 0) { file = new File(filePath + "/" + field_value + ".pdf"); } else { file = new File(filePath + "/" + field_value + ".pdf"); //file = new File( filePath +"/"+ fileName.substring(fileName.lastIndexOf("\\")+1)); } fi.write(file); //out.println("Archivo cargado en " +filePath +""); //Establecer los parametros a la BD if (new studentControl() .UpdateStudent(pkStudent, field_name, (path + "/" + field_value + ".pdf")) .equals("Datos Modificados")) { out.print("Cargado"); } else { out.print("Fail"); } } else { out.print("File much long"); } } } } catch (Exception ex) { out.println(ex); } } else { out.println("<p>No existe un archivo en este campo</p>"); } } else { response.sendRedirect("siut/alumnos.jsp"); } } } if (request.getParameter("viewFile") != null) { try (ServletOutputStream out = response.getOutputStream()) { String fileType = request.getParameter("viewFile"); String enrollment = session.getAttribute("enrollmentStudent").toString(); if (enrollment != null) { String pdfPath = "C://temp/" + enrollment + "/" + fileType + ".pdf"; File existFile = new File(pdfPath); if (existFile.exists()) { ServletOutputStream outs = response.getOutputStream(); response.setContentType("application/pdf"); File file = new File(pdfPath); response.setHeader("Content-disposition", "inline; filename=" + enrollment + "-" + fileType + ".pdf"); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { InputStream isr = new FileInputStream(file); bis = new BufferedInputStream(isr); bos = new BufferedOutputStream(outs); byte[] buff = new byte[2048]; int bytesRead; // Simple read/write loop. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (Exception e) { response.setContentType("text/html;charset=UTF-8"); out.println("Exception ----- Message ---" + e); } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } } else { response.setContentType("text/html;charset=UTF-8"); out.print("Lo sentimos no se encuentra el archivo :("); } } else { response.sendRedirect("siut/alumnos.jsp"); } } } //Load files of databases binary /*if(request.getParameter("viewFile")!=null){ try(ServletOutputStream out = response.getOutputStream()){ String file=request.getParameter("viewFile"); byte[] pdfFile; pdfFile =new studentControl().SelectFile(file, pkStudent); if((pdfFile.length>0)){ response.setContentType("application/pdf"); out.write(pdfFile); }else{ out.print("<h1>No Hay Archivo en la Base de Datos</h1>"); } if(Arrays.toString(pdfFile).equals("null")){ out.print("<h1>Parametros incorrectos!</h1>"); } } }*/ } // <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> }