Ext ajax 上传文件
页面代码

<form id="upForm">请选择文件:<input type="file" name="file1"><br /> 文件描述:<textarea cols="70" rows="5" name="desc"></textarea><br /> <input type="button" id="btn" value="上传"></form><script type="text/javascript">Ext.onReady(function() {Ext.MessageBox.alert("测试", "测试Ext是否运行");Ext.get("btn").on("click", function() {Ext.Ajax.request({url : "FileUpServlet",isUpload : true,form : "upForm",success : function(response) {Ext.MessageBox.alert("上传成功", response.responseText);}});});});</script>

public class FileUpServlet extends HttpServlet {private static final long serialVersionUID = 1L;public FileUpServlet() {super();}@Overridepublic void service(ServletRequest request, ServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");ServletContext ctx = this.getServletContext();String userFilePath = ctx.getRealPath("userFile");DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024 * 1024);factory.setRepository(new File(userFilePath));ServletFileUpload upload = new ServletFileUpload(factory);upload.setSizeMax(10 * 1024 * 1024);try {List<FileItem> fileItems = upload.parseRequest((HttpServletRequest) request); System.out.println(fileItems.size());Iterator<FileItem> iter = fileItems.iterator();while (iter.hasNext()) {FileItem fi = iter.next();if (fi.isFormField()) {String fieldName = fi.getFieldName();String fieldvalue = fi.getString(); System.out.println("name:" + fieldName);System.out.println("value:" + fieldvalue);} else {String filePath = fi.getName();if (filePath != null) {System.out.println(filePath);}if (StringUtil.isBlank(filePath)) {continue;}String extensionName = filePath.substring(filePath.lastIndexOf("."), filePath.length());//String contentType = fi.getContentType();//boolean isInMemory = fi.isInMemory();//long sizeInBytes = fi.getSize();String url = userFilePath +"\\"+ StringUtil.getUUID()+ extensionName;File uploadedFile = new File(url);if (!uploadedFile.exists()) {uploadedFile.getParentFile().mkdirs();}fi.write(uploadedFile);}}PrintWriter out = response.getWriter();out.print("创建成功");out.flush();out.close();} catch (Exception e) {e.printStackTrace();}}}