Here is the code that instead of streaming the video (which is what I want) downloads the video to the disk.
#GET
#Path("/articleVideo/{videoID}")
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getArticleVideo(#PathParam("videoID") int videoID) {
MediaDAO mediaDAO = new MediaDAO();
MediaEntity video = mediaDAO.getMediaById(videoID);
if(video == null) {
throw new WebApplicationException("Requested user not found");
}
File file = new File(video.getLink());
if (!file.exists()) {
throw new WebApplicationException(404);
}
StreamingOutput out = new StreamingOutput() {
#Override
public void write(OutputStream output) throws IOException, WebApplicationException {
try {
InputStream input = new FileInputStream(file);
IOUtils.copy(input, output);
output.flush();
}
}
};
return Response.ok(out).build();
}
I have tried many combinations and looked up many other posts here on stack overflow but none of them is working.
Related
I want to stream video file instead of Downloading it. I tried with the below code. But it is downloading.
#GET
#Path("video")
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response video() {
File file = new File("/home/lvaddi/Downloads/demoVideoFile.flv");
ResponseBuilder response = Response.ok(file, MediaType.APPLICATION_OCTET_STREAM);
response.header("Content-Disposition", "filename=videofile.flv");
return response.build();
}
You should use StreamingOutput to do that not return the file as body (which will send the whole file in bulk), something like:
new StreamingOutput() {
#Override
public void write(OutputStream output) throws IOException, WebApplicationException {
try {
InputStream input = <get input stream from your file>
IOUtils.copy(input, output);
output.flush();
} finally {
EntityUtils.consume(response.getEntity());
IOUtils.closeQuietly(response);
}
}
};
There's also an example here
I have a CAS consumer AE which is expected to iterates over CAS objects in a pipeline, serialize them and add the serialized CASs to an xml file.
public class DataWriter extends JCasConsumer_ImplBase {
private File outputDirectory;
public static final String PARAM_OUTPUT_DIRECTORY = "outputDir";
#ConfigurationParameter(name=PARAM_OUTPUT_DIRECTORY, defaultValue=".")
private String outputDir;
CasToInlineXml cas2xml;
public void initialize(UimaContext context) throws ResourceInitializationException {
super.initialize(context);
ConfigurationParameterInitializer.initialize(this, context);
outputDirectory = new File(outputDir);
if (!outputDirectory.exists()) {
outputDirectory.mkdirs();
}
}
#Override
public void process(JCas jCas) throws AnalysisEngineProcessException {
String file = fileCollectionReader.fileName;
File outFile = new File(outputDirectory, file + ".xmi");
FileOutputStream out = null;
try {
out = new FileOutputStream(outFile);
String xmlAnnotations = cas2xml.generateXML(jCas.getCas());
out.write(xmlAnnotations.getBytes("UTF-8"));
/* XmiCasSerializer ser = new XmiCasSerializer(jCas.getCas().getTypeSystem());
XMLSerializer xmlSer = new XMLSerializer(out, false);
ser.serialize(jCas.getCas(), xmlSer.getContentHandler());*/
if (out != null) {
out.close();
}
}
catch (IOException e) {
throw new AnalysisEngineProcessException(e);
}
catch (CASException e) {
throw new AnalysisEngineProcessException(e);
}
}
I am using it inside a pipeline after all my annotators, but it couldn't read CAS objects (I am getting NullPointerException at jCas.getCas()). It looks like I don't seem to understand the proper usage of CAS consumer. I appreciate any suggestions.
I want to download csv file , i take the response content and write to it , apprently wicket write after me and the content iam getting is the page html where it should be my csv
I have seen in the example the usage of throw new AbortException();
I am using version 6.7 , do you know if my version wicket has somthing instead of it ?
or rather I am doing somthing wrong ....
can you please help me ...
add(new Link<Void>("export") {
#Override
public void onClick() {
WebResponse response = (WebResponse) getResponse();
response.setAttachmentHeader("export.csv");
response.setContentType("text/csv");
OutputStream out = getResponse().getOutputStream();
try {
c.exportData(dataSource.getListForExport(), columns, out);
} catch (Exception ex) {
System.err.println(ex);
}
}
});
public <T> void exportData(List<T> list, List<IGridColumn<IDataSource<T>, T, String>> columns, OutputStream outputStream)
throws IOException {
long startTime = System.nanoTime();
PrintWriter out = new PrintWriter(new OutputStreamWriter(outputStream, Charset.forName(characterSet)));
try {
if (isExportHeadersEnabled()) {
boolean first = true;
for (IGridColumn<IDataSource<T>, T, String> col : columns) {
if (first) {
first = false;
} else {
out.print(delimiter);
System.out.println(delimiter);
}
if (col.getId().equals("checkBox")) {
continue;
}
out.print(quoteValue(col.getId()));
System.out.println(col.getId());
}
out.print("\r\n");
System.out.println("\r\n");
}
Iterator<? extends T> rowIterator = list.iterator();
while (rowIterator.hasNext()) {
T row = rowIterator.next();
boolean first = true;
for (IGridColumn<IDataSource<T>, T, String> col : columns) {
if (first) {
first = false;
} else {
out.print(delimiter);
System.out.println(delimiter);
}
if (col.getId().equals("checkBox")) {
continue;
}
Object o = (new PropertyModel<>(row, col.getId())).getObject();// ((AbstractColumn<T,
if (o != null) {
Class<?> c = o.getClass();
String s;
IConverter converter = Application.get().getConverterLocator().getConverter(c);
if (converter == null) {
s = o.toString();
} else {
s = converter.convertToString(o, Session.get().getLocale());
}
out.print(quoteValue(s));
System.out.println(quoteValue(s));
}
}
out.print("\r\n");
System.out.println("\r\n");
}
} catch (Exception ex) {
System.out.println(ex);
} finally {
System.out.println(out);
out.close();
// measure
System.out.print(System.nanoTime() - startTime);
}
}
The best way to do this is using dynamic resources. I'll suggest you to read chapter "Resource managment with Wicket" of this magnific free Wicket guide: https://code.google.com/p/wicket-guide/.
Here you have a similar example given in this guide in the section "Custom resources".
public class RSSProducerResource extends AbstractResource {
#Override
protected ResourceResponse newResourceResponse(Attributes attributes) {
ResourceResponse resourceResponse = new ResourceResponse();
resourceResponse.setContentType("text/xml");
resourceResponse.setTextEncoding("utf-8");
resourceResponse.setWriteCallback(new WriteCallback()
{
#Override
public void writeData(Attributes attributes) throws IOException
{
OutputStream outputStream = attributes.getResponse().getOutputStream();
Writer writer = new OutputStreamWriter(outputStream);
SyndFeedOutput output = new SyndFeedOutput();
try {
output.output(getFeed(), writer);
} catch (FeedException e) {
throw new WicketRuntimeException("Problems writing feed to response...");
}
}
});
return resourceResponse;
}
// method getFeed()...
}
And then you need to add the link in the desired page or component:
add(new ResourceLink("rssLink", new RSSProducerResource()));
i have created fileupload widget using UI.xml. Written Servlet. My servlet is calling but no file contents are retrieving. I have pasted my code here. can you please answer what is the problem and how to retrieve the contents? This is first time using this. Please let me know .
UI
<g:FormPanel ui:field="uploadDPAFormPanel">
<g:HorizontalPanel>
<g:Label> File
Upload: </g:Label>
<g:FileUpload ui:field="fileUpload" />
<g:Button ui:field="uploadButton" title="Upload"
Upload</g:Button>
</g:HorizontalPanel>
</g:FormPanel>
Following is my imple class:
#UiHandler("uploadButton")
void onClickUploadButton(ClickEvent event) {
GWT.log("You selected: " + fileUpload.getFilename(), null);
uploadDPAFormPanel.submit();
}
public void init() {
uploadDPAFormPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
uploadDPAFormPanel.setMethod(FormPanel.METHOD_POST);
uploadDPAFormPanel.setAction(GWT.getHostPageBaseURL()
+ uploadServlet);
uploadDPAFormPanel.addSubmitHandler(new FormPanel.SubmitHandler() {
#Override
public void onSubmit(SubmitEvent event) {
if (!"".equalsIgnoreCase(fileUpload.getFilename())) {
GWT.log("UPLOADING FILE????", null);
// NOW WHAT????
}
else{
GWT.log("UPLOA event cancel");
event.cancel(); // cancel the event
}
}
});
uploadDPAFormPanel
.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
#Override
public void onSubmitComplete(SubmitCompleteEvent event) {
//TODO need to write code to refresh the page
doAlert("Uploaded sucessfully");
}
});
}
Following is my servlet class:
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ServletFileUpload upload = new ServletFileUpload();
log.debug("UploadServlet upload:"+upload);
try {
FileItemIterator iter = upload.getItemIterator(request);
log.debug("UploadServlet iter:"+iter);
System.out.println("UploadServlet iter:"+iter);
while (iter.hasNext()) {
FileItemStream item = iter.next();
log.debug("UploadServlet iter:Field Name:"+item.getFieldName());
System.out.println(":Field Name:"+item.getFieldName());
System.out.println(":Name:"+item.getName());
System.out.println(":is form field:"+item.isFormField());
String name = item.getFieldName();
InputStream stream = item.openStream();
// Process the input stream
ByteArrayOutputStream out = new ByteArrayOutputStream();
int len;
byte[] buffer = new byte[8192];
while ((len = stream.read(buffer, 0, buffer.length)) != -1) {
out.write(buffer, 0, len);
}
int maxFileSize = 10 * (1024 * 2); // 10 megs max
if (out.size() > maxFileSize) {
throw new RuntimeException("File is > than " + maxFileSize);
}
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
You should set a name="..." on your FileUpload.
I am trying to download a file from GWT client. At server side there is a servlet which generates content of file as per request and send it back to the client.
Test Scenarios:
Scenario 1 If I hit url of servlet directly, it always give me desired result without any problems.
Scenario 2
Using GWT client on IE8,I am able to download file without any code changes. However on some other computer as soon as I try to write file content on response output stream, I get EOF exception.
org.mortbay.jetty.EofException
at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:760)
at org.mortbay.jetty.AbstractGenerator$Output.flush(AbstractGenerator.java:566)
at org.mortbay.jetty.HttpConnection$Output.flush(HttpConnection.java:911)
at java.io.BufferedOutputStream.flush(Unknown Source)
atXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.doGet(ServiceDataExporterServlet.java:110)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)Creating input stream....
Code of servlet is as follows:
try
{
output = new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE);
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int length;
int bytesWritten=0;
while ((length = data.read(buffer)) > 0) {
bytesWritten+=length;
output.write(buffer, 0, length);
}
output.flush() // At this point I am facing EOF exception.
where data is inputStream
Via means of bytesWritten variable I have confirmed that in all the three scenarios content has been written in the same way in output stream. But not sure why it is not working in some computers.
Any points will be highly appereciated.
I do something like this to download files with GWT
In the server side:
public static void sendFileToClient(String path, String filename,
int contentLen, HttpServletRequest request,
HttpServletResponse response) throws UnsupportedEncodingException
{
String ua = request.getHeader("User-Agent").toLowerCase();
boolean isIE = ((ua.indexOf("msie 6.0") != -1) || (ua
.indexOf("msie 7.0") != -1)) ? true : false;
String encName = URLEncoder.encode(filename, "UTF-8");
// Derived from Squirrel Mail and from
// http://www.jspwiki.org/wiki/BugSSLAndIENoCacheBug
if (request.isSecure())
{
response.addHeader("Pragma", "no-cache");
response.addHeader("Expires", "-1");
response.addHeader("Cache-Control", "no-cache");
}
else
{
response.addHeader("Cache-Control", "private");
response.addHeader("Pragma", "public");
}
if (isIE)
{
response.addHeader("Content-Disposition", "attachment; filename=\"" + encName + "\"");
response.addHeader("Connection", "close");
response.setContentType("application/force-download; name=\"" + encName + "\"");
}
else
{
response.addHeader("Content-Disposition", "attachment; filename=\""
+ encName + "\"");
response.setContentType("application/octet-stream; name=\""
+ encName + "\"");
if (contentLen > 0)
response.setContentLength(contentLen);
}
try
{
FileInputStream zipIn = new FileInputStream(new File(path));
ServletOutputStream out = response.getOutputStream();
response.setBufferSize(8 * 1024);
int bufSize = response.getBufferSize();
byte[] buffer = new byte[bufSize];
BufferedInputStream bis = new BufferedInputStream(zipIn, bufSize);
int count;
while ((count = bis.read(buffer, 0, bufSize)) != -1)
{
out.write(buffer, 0, count);
}
bis.close();
zipIn.close();
out.flush();
out.close();
}
catch (FileNotFoundException e)
{
System.out.println("File not found");
}
catch (IOException e)
{
System.out.println("IO error");
}
}
I have a servlet that expects for an id and then I get the related file path and I serve it to the browser with the above code.
In the client side:
public class DownloadIFrame extends Frame implements LoadHandler,
HasLoadHandlers
{
public static final String DOWNLOAD_FRAME = "__gwt_downloadFrame";
public DownloadIFrame(String url)
{
super();
setSize("0px", "0px");
setVisible(false);
RootPanel rp = RootPanel.get(DOWNLOAD_FRAME);
if (rp != null)
{
addLoadHandler(this);
rp.add(this);
setUrl(url);
}
else
openURLInNewWindow(url);
}
native void openURLInNewWindow(String url) /*-{
$wnd.open(url);
}-*/;
public HandlerRegistration addLoadHandler(LoadHandler handler)
{
return addHandler(handler, LoadEvent.getType());
}
public void onLoad(LoadEvent event)
{
}
}
In you hosted page add this Iframe
<iframe src="javascript:''" id="__gwt_downloadFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe>
Then to download a file put something like this:
btnDownload.addClickHandler(new ClickHandler()
{
public void onClick(ClickEvent arg0)
{
String url = GWT.getModuleBaseURL()
+ "/downloadServlet?id=[FILE_ID]";
new DownloadIFrame(url);
}
});
I hope this helps you.
Happy coding!
It happens also if the OutputStream flushes after InputStream was closed, like this:
myInputStream.close();
myOutputStream.flush();
myOutputStream.close();
it should be like:
myOutputStream.flush();
myInputStream.close();
myOutputStream.close();
Hope it helps :-)