Java file upload in Servlet using Apache commons FileUpload component (sample code)
This should be a very simple program, but it took me some time to figure out how to use Apache commons FileUpload component. Since nobody will read this, I put it here only for my own reference. Be careful about how to save the uploaded files to server. The HTML code for Form is too simple and can find everywhere, so the following is only the code of doPost method in servlet.
protected void doPost(HttpServletRequest res, HttpServletResponse response) throws ServletException, IOException { // Commons file upload classes are specifically instantiated FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); ServletOutputStream out = null; try { // Parse the incoming HTTP request // Commons takes over incoming request at this point // Get an iterator for all the data that was sent List items = upload.parseRequest(res); Iterator iter = items.iterator(); // Set a response content type response.setContentType("text/html"); // Setup the output stream for the return XML data out = response.getOutputStream(); // Iterate through the incoming request data while (iter.hasNext()) { // Get the current item in the iteration FileItem item = (FileItem) iter.next(); // If the current item is an HTML form field if (item.isFormField()) { // Return an XML node with the field name and value out.println("this is a form data " + item.getFieldName() + "<br>"); // If the current item is file data } else { // Specify where on disk to write the file // Using a servlet init param to specify location on disk // Write the file data to disk // TODO: Place restrictions on upload data File disk = new File("C:\\uploaded_files\\"+item.getName()); item.write(disk); // Return an XML node with the file name and size (in bytes) //out.println(getServletContext().getRealPath("/WEB_INF")); out.println("this is a file with name: " + item.getName()); } } // Close off the response XML data and stream out.close(); // Rudimentary handling of any exceptions // TODO: Something useful if an error occurs } catch (FileUploadException fue) { fue.printStackTrace(); } catch (IOException ioe) { ioe.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } |
<pre><code> String foo = "bar"; </code></pre>
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mrun
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VIJAY GORAMBEKAR
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Meeta Pal
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ryanlr
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Meeta Pal