I wrote the below code for file upload, but once submit is done it is redirecting to the action url.
My requirement is, once submit is done page should not forward and should present (redirect) in the same page.
---------------------Client code----------------------
public class MywebApp implements EntryPoint {
public void onModuleLoad() {
Canvas page = new Canvas();
final DynamicForm form = new DynamicForm();
form.setWidth100();
form.setNumCols(2);
final UploadItem upload = new UploadItem();
upload.setName("upload");
form.setEncoding(Encoding.MULTIPART);
form.setMethod(FormMethod.POST);
form.setAction(GWT.getModuleBaseURL()+"fileupload");
SubmitItem submit = new SubmitItem();
submit.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
form.setCanSubmit(true);
}
});
form.setItems(upload,submit);
form.draw();
page.addChild(form);
page.draw();
}
}
------------------------ servlet Code -------------------------------
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// process only multipart requests
if (ServletFileUpload.isMultipartContent(req)) {
// 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 item : items) {
// process only file upload - discard other form item types
if (item.isFormField())
continue;
String fileName = item.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()) {
item.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.");
}
}
My requirement is, once submit is done page should not forward and should present (redirect) in the same page.
---------------------Client code----------------------
public class MywebApp implements EntryPoint {
public void onModuleLoad() {
Canvas page = new Canvas();
final DynamicForm form = new DynamicForm();
form.setWidth100();
form.setNumCols(2);
final UploadItem upload = new UploadItem();
upload.setName("upload");
form.setEncoding(Encoding.MULTIPART);
form.setMethod(FormMethod.POST);
form.setAction(GWT.getModuleBaseURL()+"fileupload");
SubmitItem submit = new SubmitItem();
submit.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
form.setCanSubmit(true);
}
});
form.setItems(upload,submit);
form.draw();
page.addChild(form);
page.draw();
}
}
------------------------ servlet Code -------------------------------
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// process only multipart requests
if (ServletFileUpload.isMultipartContent(req)) {
// 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 item : items) {
// process only file upload - discard other form item types
if (item.isFormField())
continue;
String fileName = item.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()) {
item.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.");
}
}
Comment