jQuery_file_upload-Servlet上传版本

package com.yc.servlet; import java.awt.image.BufferedImage; import java.io.*; import java.util.List; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.imgscalr.Scalr; import org.json.JSONArray; import org.json.JSONObject; public class UploadServlet extends HttpServlet { /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) * */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (request.getParameter("getfile") != null && !request.getParameter("getfile").isEmpty()) { //设施上传路径 File file = new File(request.getSession().getServletContext().getRealPath("/")+"imgs/"+request.getParameter("getfile")); if (file.exists()) { int bytes = 0; ServletOutputStream op = response.getOutputStream(); response.setContentType(getMimeType(file)); response.setContentLength((int) file.length()); response.setHeader( "Content-Disposition", "inline; filename=\"" + file.getName() + "\"" ); byte[] bbuf = new byte[1024]; DataInputStream in = new DataInputStream(new FileInputStream(file)); while ((in != null) && ((bytes = in.read(bbuf)) != -1)) { op.write(bbuf, 0, bytes); } in.close(); op.flush(); op.close(); } } else if (request.getParameter("delfile") != null && !request.getParameter("delfile").isEmpty()) { File file = new File(request.getSession().getServletContext().getRealPath("/")+"imgs/"+ request.getParameter("delfile")); if (file.exists()) { file.delete(); // TODO:check and report success } } else if (request.getParameter("getthumb") != null && !request.getParameter("getthumb").isEmpty()) { File file = new File(request.getSession().getServletContext().getRealPath("/")+"imgs/"+request.getParameter("getthumb")); if (file.exists()) { System.out.println(file.getAbsolutePath()); String mimetype = getMimeType(file); //判断文件类型 if (mimetype.endsWith("png") || mimetype.endsWith("jpeg")|| mimetype.endsWith("jpg") || mimetype.endsWith("gif")) { BufferedImage im = ImageIO.read(file); if (im != null) { BufferedImage thumb = Scalr.resize(im, 75); ByteArrayOutputStream os = new ByteArrayOutputStream(); if (mimetype.endsWith("png")) { ImageIO.write(thumb, "PNG" , os); response.setContentType("image/png"); } else if (mimetype.endsWith("jpeg")) { ImageIO.write(thumb, "jpg" , os); response.setContentType("image/jpeg"); } else if (mimetype.endsWith("jpg")) { ImageIO.write(thumb, "jpg" , os); response.setContentType("image/jpeg"); } else { ImageIO.write(thumb, "GIF" , os); response.setContentType("image/gif"); } ServletOutputStream srvos = response.getOutputStream(); response.setContentLength(os.size()); response.setHeader( "Content-Disposition", "inline; filename=\"" + file.getName() + "\"" ); os.writeTo(srvos); srvos.flush(); srvos.close(); } } } // TODO: check and report success } else { PrintWriter writer = response.getWriter(); writer.write("call POST with multipart form data"); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) * */ @SuppressWarnings("unchecked") @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (!ServletFileUpload.isMultipartContent(request)) { throw new IllegalArgumentException("Request is not multipart, please 'multipart/form-data' enctype for your form."); } response.setContentType("application/json;charset=UTF-8"); ServletFileUpload uploadHandler = new ServletFileUpload(new DiskFileItemFactory()); PrintWriter writer = response.getWriter(); JSONArray json = new JSONArray(); try { List<FileItem> items = uploadHandler.parseRequest(request); for (FileItem item : items) { if (!item.isFormField()) { File file = new File(request.getSession().getServletContext().getRealPath("/")+"imgs/", item.getName()); item.write(file); JSONObject jsono = new JSONObject(); jsono.put("name", item.getName()); jsono.put("size", item.getSize()); jsono.put("url", "UploadServlet?getfile=" + item.getName()); jsono.put("thumbnail_url", "UploadServlet?getthumb=" + item.getName()); jsono.put("delete_url", "UploadServlet?delfile=" + item.getName()); jsono.put("delete_type", "GET"); json.put(jsono); System.out.println(json.toString()); } } } catch (FileUploadException e) { throw new RuntimeException(e); } catch (Exception e) { throw new RuntimeException(e); } finally { writer.write(json.toString()); writer.close(); } } private String getMimeType(File file) { String mimetype = ""; if (file.exists()) { if (getSuffix(file.getName()).equalsIgnoreCase("png")) { mimetype = "image/png"; }else if(getSuffix(file.getName()).equalsIgnoreCase("jpg")){ mimetype = "image/jpg"; }else if(getSuffix(file.getName()).equalsIgnoreCase("jpeg")){ mimetype = "image/jpeg"; }else if(getSuffix(file.getName()).equalsIgnoreCase("gif")){ mimetype = "image/gif"; }else { javax.activation.MimetypesFileTypeMap mtMap = new javax.activation.MimetypesFileTypeMap(); mimetype = mtMap.getContentType(file); } } return mimetype; } private String getSuffix(String filename) { String suffix = ""; int pos = filename.lastIndexOf('.'); if (pos > 0 && pos < filename.length() - 1) { suffix = filename.substring(pos + 1); } return suffix; } }