Ajax 上传图片并预览的简单实现

     
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); String path = request.getServletContext().getRealPath("/upload"); String name = null; try { List items = upload.parseRequest(request); for (FileItem item : items) { if(item.isFormField()){ System.out.println(item.getFieldName() + ": " + item.getString()); } else { name = item.getName(); item.write(new File(path,name)); } } PrintWriter out = response.getWriter(); out.print("{"); out.print("url:\"" + name +"\""); out.print("}"); } catch (Exception e) { e.printStackTrace(); } }