I'm new to GWT app and I need help with file download
My file upload is so
clint
//-------------------upload--------------------------
final FormPanel form = new FormPanel();
form.setAction(UPLOAD_ACTION_URL);
// Because we're going to add a FileUpload widget, we'll need to set
the
// form to use the POST method, and multipart MIME encoding.
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);
// Create a panel to hold all of the form widgets.
VerticalPanel panel = new VerticalPanel();
form.setWidget(panel);
// Create a TextBox, giving it a name so that it will be submitted.
final TextBox tb = new TextBox();
tb.setName("textBoxFormElement");
panel.add(tb);
// Create a FileUpload widget.
final FileUpload upload = new FileUpload();
upload.setName("uploadFormElement");
panel.add(upload);
// Add a 'submit' button.
panel.add(new Button("Submit", new ClickHandler() {
public void onClick(ClickEvent event) {
form.submit();
}
}));
// Add an event handler to the form.
form.addSubmitHandler(new FormPanel.SubmitHandler() {
public void onSubmit(SubmitEvent event) {
// This event is fired just before the form is submitted. We can
// take this opportunity to perform validation.
//if (tb.getText().length() == 0) {
//Window.alert("The text box must not be empty");
//event.cancel();
//}
}
});
form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
// When the form submission is successfully completed, this
// event is fired. Assuming the service returned a response of
type
// text/html, we can get the result text here (see the FormPanel
// documentation for further explanation).
Window.alert(event.getResults());
FileName=upload.getFilename();
tb.setText(FileName);
}
});
RootPanel.get().add(form);
Servlet:
package de.tuberlin.pjel2009.server;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;
/**
* servlet to handle file upload requests
*
*
*
*/
public class FileUploadServlet extends HttpServlet {
//private static final String UPLOAD_DIRECTORY = "d:\\uploaded\\";
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse
resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse
resp)
throws ServletException, IOException {
// process only multipart requests
final String UPLOAD_DIRECTORY=req.getSession().getServletContext
().getRealPath("/")+ "job\\";
if (ServletFileUpload.isMultipartContent(req)) {
File tempDir = getTempDir(UPLOAD_DIRECTORY);
if (!tempDir.exists()) {
tempDir.mkdirs();
}
// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new
ServletFileUpload(factory);
// Parse the request
try {
List<FileItem> items = upload.parseRequest(req);
for (FileItem fileItem : items) {
// process only file upload
if (fileItem.isFormField()) continue;
String fileName = fileItem.getName();
// get only the file name not whole path
if (fileName != null) {
fileName =
FilenameUtils.getName(fileName);
}
File uploadedFile = new
File(UPLOAD_DIRECTORY, fileName);
if (uploadedFile.createNewFile()) {
fileItem.write(uploadedFile);
resp.setStatus(HttpServletResponse.SC_CREATED);
resp.getWriter().print("The
file was created successfully.");
resp.flushBuffer();
} else
throw new IOException("The file
already exists in repository.");
}
} catch (Exception e) {
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"An error occurred while
creating the file : " + e.getMessage
());
}
} else {
resp.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE,
"Request contents type
is not supported by the servlet.");
}
}
private File getTempDir(String Dir) {
return new File(Dir);
}
we upload the file in a folder called job
on hyperlink or button --> download file from this folder
Can you give me an example to:
1) client-side
2) server-side
3) web.xml
Thanks!!
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