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 Control; import Model.Image; import DataAccess.Image_DAL; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.nio.file.Path; import java.sql.SQLException; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.RequestDispatcher; 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.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author HP EliteBook */ @WebServlet(name = "LoadImage", urlPatterns = { "/LoadImage" }) public class LoadImage 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"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here. You may use following sample code. */ out.println("<!DOCTYPE html>"); out.println("<html>"); out.println("<head>"); out.println("<title>Servlet LoadImage</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Servlet LoadImage at " + request.getContextPath() + "</h1>"); out.println("</body>"); out.println("</html>"); } } private Boolean isImageFile(Path filePath) { String[] supportedExtensions = { ".jpg", ".png", ".JPG", ".PNG" }; for (String extension : supportedExtensions) { if (filePath.toString().endsWith(extension)) { return true; } } return false; } private List<Image> loadImages(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, SQLException, ClassNotFoundException { // this code only runs with java 8 String nameImage = request.getParameter("nameImage"); String typeImage = request.getParameter("typeImage"); String authorImage = request.getParameter("authorImage"); List<Image> images = Image_DAL.Search(nameImage, typeImage, authorImage, ""); return images; } // <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 { try { List<Image> images = loadImages(request, response); request.setAttribute("images", images); } catch (SQLException | ClassNotFoundException ex) { Logger.getLogger(LoadImage.class.getName()).log(Level.SEVERE, null, ex); } RequestDispatcher dispatcher = request.getRequestDispatcher("/LoadImage.jsp"); dispatcher.forward(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 { String tempPath = "/temp"; String absoluteTempPath = this.getServletContext().getRealPath(tempPath); String absoluteFilePath = this.getServletContext().getRealPath("/data/Image"); int maxFileSize = 50 * 1024; int maxMemSize = 4 * 1024; try { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(maxMemSize); File file = new File(absoluteTempPath); if (file == null) { // tao thu muc } factory.setRepository(file); ServletFileUpload upload = new ServletFileUpload(factory); //upload.setProgressListener(new MyProgressListener(out)); List<FileItem> items = upload.parseRequest(request); if (items.size() > 0) { for (FileItem item : items) { if (!item.isFormField()) { if ("images".equals(item.getFieldName())) { if (item.getName() != null && !item.getName().isEmpty()) { String extension = null; if (item.getName().endsWith("jpg")) { String newLink = "/Image/" + Image.LengthListImg() + ".jpg"; file = new File(absoluteFilePath + "//" + Image.LengthListImg() + ".jpg"); // G?i hm add hnh vo database, link hnh l newLink item.write(file); } else if (item.getName().endsWith("png")) { String newLink = "/Image/" + Image.LengthListImg() + ".png"; file = new File(absoluteFilePath + "//" + Image.LengthListImg() + ".png"); // G?i hm add hnh vo database, link hnh l newLink item.write(file); } else if (item.getName().endsWith("JPG")) { String newLink = "/Image/" + Image.LengthListImg() + ".JPG"; file = new File(absoluteFilePath + "//" + Image.LengthListImg() + ".JPG"); // G?i hm add hnh vo database, link hnh l newLink item.write(file); } else if (item.getName().endsWith("PNG")) { String newLink = "/Image/" + Image.LengthListImg() + ".PNG"; file = new File(absoluteFilePath + "//" + Image.LengthListImg() + ".PNG"); // G?i hm add hnh vo database, link hnh l newLink item.write(file); } } } } else { } } response.sendRedirect(request.getContextPath() + "/LoadImage.jsp"); return; } List<Image> images = loadImages(request, response); request.setAttribute("images", images); request.setAttribute("error", "No file upload"); RequestDispatcher dispatcher = this.getServletContext().getRequestDispatcher("/LoadImage.jsp"); dispatcher.forward(request, response); } catch (Exception ex) { System.err.println(ex); } } /** * Returns a short description of the servlet. * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }