Java Reference
In-Depth Information
Upload
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The servlet FileUploadServlet.java can be found in the tut-install /examples/
web/fileupload/src/java/fileupload/ directory. The servlet begins as fol-
lows:
Click here to view code image
@WebServlet(name = "FileUploadServlet", urlPatterns = {"/upload"})
@MultipartConfig
public class FileUploadServlet extends HttpServlet {
private final static Logger LOGGER =
Log-
ger.getLogger(FileUploadServlet.class.getCanonicalName());
The @WebServlet annotation uses the urlPatterns property to define servlet map-
pings.
The @MultipartConfig annotation indicates that the servlet expects requests to made
using the multipart/form-data MIME type.
The processRequest method retrieves the destination and file part from the request,
then calls the getFileName method to retrieve the file name from the file part. The
method then creates a FileOutputStream and copies the file to the specified des-
tination. The error-handling section of the method catches and handles some of the
most common reasons why a file would not be found. The processRequest and
getFileName methods look like this:
Click here to view code image
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
// Create path components to save the file
final String path = request.getParameter("destination");
final Part filePart = request.getPart("file");
final String fileName = getFileName(filePart);
OutputStream out = null;
InputStream filecontent = null;
final PrintWriter writer = response.getWriter();
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