Answer / Basant Singh Yadav

To write a Servlet for file upload, you need to implement the doPost method and use apache commons FileUpload API. Here's a simple example:nn```javanimport java.io.*;nimport javax.servlet.*;nimport javax.servlet.http.*;nimport org.apache.commons.fileupload.*;nimport org.apache.commons.fileupload.disk;npublic class FileUploadServlet extends HttpServlet {n private String saveDir = "uploads/";n public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {n DiskFileUpload upload = new DiskFileUpload();n List items = upload.parseRequest(request);n Iterator iter = items.iterator();n FileItem item;n while (iter.hasNext()) {n item = (FileItem)iter.next();n if (!item.isFormField()) {n String path = saveDir + FileUtils.getFileName(item.getName());n File file = new File(path);n item.write(file);n }n }n }n}

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