I'm using fileuplod primefaces. I have 3 buttons. Every button is responsible for uploading a file. My first steep is to use 3 methods on my bean to upload every file.
Is there a way to make the same method for all types? Every file has his own directory.
<h:form enctype="multipart/form-data" style="height:125px;width:75px;">
<p:fileUpload auto="true"
fileUploadListener="#{composantbean.handleFileUpload(???,1)}"
sizeLimit="2097152"
label="Choose"
allowTypes="/(\.|\/)(pdf)$/"
description="Images"/>
</h:form>
On my managed bean, I'm thinking of this solution:
public void handleFileUpload(FileUploadEvent event,int i) {
String lienPDN =destination+"PDN\\"+FilenameUtils.getName(event.getFile().getFileName());
File result = new File(lienPDN);
try {
FileOutputStream fileOutputStream = new FileOutputStream(result);
byte[] buffer = new byte[BUFFER_SIZE];
int bulk;
InputStream inputStream = event.getFile().getInputstream();
while (true) {
bulk = inputStream.read(buffer);
if (bulk < 0) {
break;
}
fileOutputStream.write(buffer, 0, bulk);
fileOutputStream.flush();
}
fileOutputStream.close();
inputStream.close();
FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName()+ " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
selcetitem.setLienPdn(lienPDN);
} catch (IOException e) {
e.printStackTrace();
FacesMessage error = new FacesMessage(FacesMessage.SEVERITY_ERROR,"The files were not uploaded!", "");
FacesContext.getCurrentInstance().addMessage(null, error);
}
}
I think a better way might be to implements three handleFileUpload() methods. Each can handle their unique code (e.g. passing the right filepath). From there you can call a private void wrapUpUpload(String path, (...)).
Most of all this keeps your code readable. If also prevents the need for changing the default implementation of handleFileUpload().
E.g.: make sure to replace 1, 2, 3 with something meaningful
void handleFileUpload1(FileUploadEvent event) {
String path = "/uploads/1/";
wrapUpUpload(path);
}
void handleFileUpload2(FileUploadEvent event) {
String path = "/uploads/2/";
wrapUpUpload(path);
}
void handleFileUpload3(FileUploadEvent event) {
String path = "/uploads/3/";
wrapUpUpload(path);
}
private void wrapUpUpload(String path, (...)) {
// Upload the file
}
Related
I'm trying to implement a wrapped "move" function with Xodus, but something is not working out right:
#Override
public boolean move(String appId, String name, String targetName) {
final boolean[] success = new boolean[1];
final Environment env = manager.getEnvironment(xodusRoot, appId);
final VirtualFileSystem vfs = manager.getVirtualFileSystem(env);
env.executeInTransaction(
new TransactionalExecutable() {
#Override
public void execute(#NotNull final Transaction txn) {
File file = vfs.openFile(txn, name, false);
InputStream input = vfs.readFile(txn, file);
if(input != null) {
File targetFile = vfs.openFile(txn, targetName, true);
DataOutputStream output = new DataOutputStream(vfs.writeFile(txn, targetFile));
try {
output.write(ByteStreams.toByteArray(input));
} catch (IOException e) {
e.printStackTrace();
}
vfs.deleteFile(txn, name);
success[0] = true;
}
}
});
// vfs.shutdown();
// env.close();
return success[0];
}
The problem is the file gets moved but the byte array is not getting copied, not sure if the problem is because of multiple VFS operation in the same transaction. Can someone give me a hint of why the bytes from the source file are not getting copied properly?
Looks like you are trying to implement another version of VirtualFileSystem.renameFile(..).
I'm creating a little java app and I'm trying to load the yml files based on config.yml lang set (en/it) but I can't find a way to load them, only the last one in an array is loaded which is "it" for me.
I know that my method is probably the worst solution for a language file, I'm open to every method that will help me with the problem. But I prefer an external lang_en/it file instead of internal ones (Or is it better internal?)
After I set the language, the app will self-update every text in every class.
static final Properties props = new Properties();
static WelcomeMessage main = new WelcomeMessage();
static File file = null;
static File folder = null;
static boolean os = main.os.startsWith("Windows");
public static void create() {
String[] lang = {"en", "it"};
for (String s : lang) {
file = new File(WelcomeMessage.user + "/AppData/Roaming/MyApp/lang_" + s + ".yml");
folder = new File(file.getParent());
SetLanguages(s);
}
if (!file.exists()) {
try {
if (os) {
folder.mkdir();
file.createNewFile();
} else {
file = new File(main.user + "/Library/Application Support/MyApp/config.yml");
folder.mkdir();
file.createNewFile();
}
} catch (Exception e) {
System.out.println(e + " " + file);
}
}
}
public static void SetLanguages(String lang) {
if (lang.equals("en")) {
store("Settings.Save", "Save");
store("Settings.ConfigPath", "Config Path");
store("Settings.Language", "Language");
store("Settings.Title", "Settings");
} else if (lang.equals("it")) {
store("Settings.Save", "Salva");
store("Settings.ConfigPath", "Percorso config");
store("Settings.Language", "Lingua");
store("Settings.Title", "Impostazioni");
}
}
public static String get(String value) {
String key = null;
try {
FileInputStream in = new FileInputStream(file);
props.load(in);
key = props.getProperty(value);
in.close();
} catch (Exception fnf) {
System.out.println(fnf);
}
return key;
}
public static void store(String value, String key) {
try {
FileOutputStream out = new FileOutputStream(file);
props.setProperty(value, key);
props.store(out, null);
out.close();
} catch (Exception fnf) {
System.out.println(fnf);
}
}
This is how I get a text from yml:
path.setText(Language.get("Settings.ConfigPath"));
language.setText(Language.get("Settings.Language"));
f.setTitle(Language.get("Settings.Title"));
save.setText(Language.get("Settings.Save"));
And this my Language.get(key)
public static String get(String value) {
String key = null;
try {
FileInputStream in = new FileInputStream(file);
props.load(in);
key = props.getProperty(value);
in.close();
} catch (Exception fnf) {
System.out.println(fnf);
}
return key;
}
I suggest the following changes:
Create a Settings class to hold the properties save, configPath, language and title. Even better if this class uses an immutable builder pattern, because once set, the properties will never change.
Create a SettingsFactory class with method getSettings(language). This class shall also have a field Map<String, Settings>. In the constructor (or a static block), first check if a file exists on the disk, and if yes, load it into the map. If not, populate the map, one entry for each language, and persist to the disk.
getSettings would simply return the value from the map corresponding to the given language.
The format of the file written to the disk is a different matter. You say YAML, but I'm not seeing any YAML specific code in your snippet. If you don't know how to write a map to YAML, open a different question.
I'm not sure if that's the right way to ask this, but I'm gonna try to explain my case and what I need.
I have a big java project, that upload files in many different java classes, like too many, and I have around 7 different main folders where the files are uploaded. The files at the moment are saved inside the webapp context, and I need to save them outside of context.
If there were only a few classes that upload these files I could spend a few days changing every class and direct it to a path outisde of context, but there are way too many classes, so I have to figure out a way to do it without changing every class, or any class at all, which would be ideal.
Every upload is done in the following way:
I get real path of one of my main folders:
String realpath = httpServletRequest.getSession()
.getServletContext()
.getRealPath("/mainfolder1/mainsubfolder1/");
Then I get the file and set custom file name:
FormFile file = myForm.getFile();
String contentType = file.getContentType();
String fileName = file.getFileName();
int fileSize = file.getFileSize();
customFileName = "anyName" + fileName.substring(fileName.lastIndexOf("."));
Then I validate and save the file:
if (fileSize > 0 && contentType != null && fileName.length() > 0){
InputStream in = file.getInputStream();
OutputStream bos = new FileOutputStream(realpath + "/" + customFileName);
int byteRead = 0;
byte[] buffer = new byte[8192];
while ((byteRead = in.read(buffer, 0, 8192)) != -1){
bos.write(buffer, 0, byteRead);
}
bos.close();
in.close();
}
Very simple way to save my files, and as you can see, they are saved inside context.
So if I could somehow override java.io.FileOutputStream, to not only save it inside context, but to make a copy outside of context too, that would be great, like save it in the specified path and also on some other path outside of context.
But I don't know if this is possible, or how to reproduce this behaviour.
What I need is to keep the class code exactly as it is but write the file 2 times:
First here: "/insideContext/mainfolder1/mainsubfolder1/"
Then here: "/outsideContext/mainfolder1/mainsubfolder1/"
Is this possible? If not, what would be the best way to accomplish this?
I'd refactor and use Decorator or Wrapper pattern. More about it here
Below some simple idea you could use.
public class ContextAwareDuplicatorOutputStream extends OutputStream {
FileOutputStream insideContext;
FileOutputStream outsideContext;
public ContextAwareDuplicatorOutputStream(String insideContextPath,
String outsideContextPath, String fileName)
throws FileNotFoundException {
insideContext = new FileOutputStream(insideContextPath
+ File.pathSeparator + fileName);
outsideContext = new FileOutputStream(outsideContextPath
+ File.pathSeparator + fileName);
}
#Override
public void close() throws IOException {
insideContext.close();
outsideContext.close();
}
#Override
public void flush() throws IOException {
insideContext.flush();
outsideContext.flush();
}
#Override
public void write(byte[] b) throws IOException {
insideContext.write(b);
outsideContext.write(b);
}
#Override
public void write(byte[] b, int off, int len) throws IOException {
insideContext.write(b, off, len);
outsideContext.write(b, off, len);
}
#Override
public void write(int b) throws IOException {
insideContext.write(b);
outsideContext.write(b);
}
}
Since you don't want to edit anything on your code, create a ServletContextListener that monitor the folder where you upload, and on the new file event, you copy it to the proper directory. Here is awnsered how to monitor a directory. Directory listener in Java
Below here is a small code, not really perfect, but the idea is there
public class FileMonitorServletContextListener implements
ServletContextListener {
public interface FileMonitor {
void start(String fromFolder, String toFolder);
void stop();
}
public class SimpleThreadedWatcher implements FileMonitor {
private class SimpleThread extends Thread {
private boolean running = true;
private String fromFolder;
private String toFolder;
public SimpleThread(String fromFolder, String toFolder) {
this.fromFolder = fromFolder;
this.toFolder = toFolder;
}
private void copy(Path child, String toFolder) {
// Copy the file to the folder
}
#Override
public void run() {
try {
WatchService watcher = FileSystems.getDefault()
.newWatchService();
Path fromPath = Paths.get(fromFolder);
watcher = FileSystems.getDefault().newWatchService();
WatchKey key = fromPath.register(watcher,
StandardWatchEventKinds.ENTRY_CREATE);
while (running) {
for (WatchEvent<?> event : key.pollEvents()) {
// Context for directory entry event is the file
// name of
// entry
#SuppressWarnings("unchecked")
WatchEvent<Path> ev = (WatchEvent<Path>) event;
Path name = ev.context();
Path child = fromPath.resolve(name);
// print out event
System.out.format("%s: %s\n", event.kind().name(),
child);
copy(child, toFolder);
boolean valid = key.reset();
if (!valid) {
break;
}
}
Thread.sleep(1000);
}
} catch (Exception e) {
throw new RuntimeException("Error: ", e);
}
}
public void stopWorking() {
running = false;
}
}
private SimpleThread worker;
#Override
public void start(String fromFolder, String toFolder) {
worker = new SimpleThread(fromFolder, toFolder);
worker.start();
}
#Override
public void stop() {
worker.stopWorking();
}
}
FileMonitor fileMonitor = new SimpleThreadedWatcher();
#Override
public void contextDestroyed(ServletContextEvent arg0) {
fileMonitor.stop();
}
#Override
public void contextInitialized(ServletContextEvent arg0) {
fileMonitor.start("FROM", "TO");
}
}
I got a problem when files were download , I can't get any actions or events when clicking any links , butttons and menues after download process was done.
Below is my codes for excel file download button ...
Button btnDownloadExcel = new Button("Excel Download");
btnDownloadExcel.addStyleName("downloadButton");
btnDownloadExcel.addClickListener(new ClickListener() {
#Override
public void buttonClick(final ClickEvent event) {
StringBuilder url = new StringBuilder("/myproject/filedownload.html?category=excel");
url.append("&seq=" + 111);
getUI().getPage().open(url.toString(), "_self");
}
});
Below is servlet for handle excel file download request (I used JExcel API for excel file)
#WebServlet(value = "/filedownload.html")
public class DownloadServletController extends HttpServlet {
private final Logger log = LoggerFactory.getLogger(DownloadServletController.class);
protected final void doGet(final HttpServletRequest request,
final HttpServletResponse response) throws ServletException, IOException {
String category = request.getParameter("category");
long seq = request.getParameter("seq") == null ? -1L : Long.parseLong(request.getParameter("seq"));
byte[] stream = null;
if (category.equals("excel")) {
try {
stream = getSampleExcelStream(seq);
}
catch (BusinessException e) {
log.error("Generating streams for " + category + " got Error !" + e);
}
ExcelSupport.createExcel("Test", seq, stream, response);
}
}
private byte[] getSampleExcelStream(final long seq) throws BusinessException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
String staticDir = System.getProperty("staticDir");
String templateDir = staticDir + "/templates/sample_excel_template.xls";
WorkbookSettings wsWrite = new WorkbookSettings();
wsWrite.setEncoding("UTF-8");
wsWrite.setAutoFilterDisabled(false);
WritableWorkbook workBook = Workbook.createWorkbook(baos, Workbook.getWorkbook(new File(templateDir)),
wsWrite);
workBook.write();
baos.close();
workBook.close();
}
catch (BiffException e) {
throw new BusinessException("Excel file Creating Error!");
}
catch (WriteException e) {
throw new BusinessException("Error ! writing excel file process has occured!");
}
catch (FileNotFoundException e) {
throw new BusinessException("FileNotFoundException, when getting stream for excel", e);
}
catch (IOException e) {
throw new BusinessException("IOException, when getting stream for excel", e);
}
return baos.toByteArray();
}
}
ExcelSupport.java is below
public final class ExcelSupport {
private ExcelSupport() {
}
private static final Logger LOGGER = LoggerFactory.getLogger(ExcelSupport.class);
public static void createExcel(final String fileNamePrefix, final long seq,
final byte[] stream, final HttpServletResponse response) {
StringBuffer fileName = new StringBuffer();
fileName.append(fileNamePrefix + "_");
if (seq > -1) {
fileName.append("(uid-" + seq + ")_");
}
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
fileName.append(sdf.format(new Date()));
fileName.append(".xls");
StringBuffer sbContentDispValue = new StringBuffer();
sbContentDispValue.append("inline");
sbContentDispValue.append("; filename=");
sbContentDispValue.append(fileName);
response.setContentType("application/msexcel");
response.addHeader("Cache-Control", "max-age=30");
response.addHeader("Content-disposition", sbContentDispValue.toString());
response.setContentLength(stream.length);
try {
ServletOutputStream osStream = response.getOutputStream();
osStream.write(stream);
osStream.flush();
osStream.close();
}
catch (IOException e) {
LOGGER.error("Creating Excel for " + fileName + " got Error !" + e);
}
}
}
Can somebody correct me what I am wrong ? Download process was fine , nothing error and I got excel file successfully. But I have no idea why browser was freeze. I can't see any error logs or messages in IDE console and browser's console. Thanks for reading my question !
PS : I am sure this codes work fine and did not freeze on other GWT projects.
Now I found the problem . I used Network console of Firefox 31 and here is screen-shoot for before download and here is after download. I notice that I lost all web datas because the replacing url by getUI().getPage().open(url.toString(), "_self");
So , if I use others instead of _self , everythings were fine but browsers were block popups. I can't tell the users to enable popups of their browsers . So , finally I use Link component as below ..
Link linkDownloadExcel = new Link("Excel Download", new ExternalResource(
"/myproject/filedownload.html?category=excel&seq=" + 111), "_blank", -1, -1, BorderStyle.DEFAULT);
linkDownloadExcel.addStyleName("downloadButton");
linkDownloadExcel.setIcon(new ExternalResource("/myproject/images/excel-icon.png"));
hlButtonLayout.addComponent(linkDownloadExcel);
How can I use the library to download a file and print out bytes saved? I tried using
import static org.apache.commons.io.FileUtils.copyURLToFile;
public static void Download() {
URL dl = null;
File fl = null;
try {
fl = new File(System.getProperty("user.home").replace("\\", "/") + "/Desktop/Screenshots.zip");
dl = new URL("http://ds-forums.com/kyle-tests/uploads/Screenshots.zip");
copyURLToFile(dl, fl);
} catch (Exception e) {
System.out.println(e);
}
}
but I cannot display bytes or a progress bar. Which method should I use?
public class download {
public static void Download() {
URL dl = null;
File fl = null;
String x = null;
try {
fl = new File(System.getProperty("user.home").replace("\\", "/") + "/Desktop/Screenshots.zip");
dl = new URL("http://ds-forums.com/kyle-tests/uploads/Screenshots.zip");
OutputStream os = new FileOutputStream(fl);
InputStream is = dl.openStream();
CountingOutputStream count = new CountingOutputStream(os);
dl.openConnection().getHeaderField("Content-Length");
IOUtils.copy(is, os);//begin transfer
os.close();//close streams
is.close();//^
} catch (Exception e) {
System.out.println(e);
}
}
If you are looking for a way to get the total number of bytes before downloading, you can obtain this value from the Content-Length header in http response.
If you just want the final number of bytes after the download, it is easiest to check the file size you just write to.
However if you want to display the current progress of how many bytes have been downloaded, you might want to extend apache CountingOutputStream to wrap the FileOutputStream so that everytime the write methods are called it counts the number of bytes passing through and update the progress bar.
Update
Here is a simple implementation of DownloadCountingOutputStream. I am not sure if you are familiar with using ActionListener or not but it is a useful class for implementing GUI.
public class DownloadCountingOutputStream extends CountingOutputStream {
private ActionListener listener = null;
public DownloadCountingOutputStream(OutputStream out) {
super(out);
}
public void setListener(ActionListener listener) {
this.listener = listener;
}
#Override
protected void afterWrite(int n) throws IOException {
super.afterWrite(n);
if (listener != null) {
listener.actionPerformed(new ActionEvent(this, 0, null));
}
}
}
This is the usage sample :
public class Downloader {
private static class ProgressListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
// e.getSource() gives you the object of DownloadCountingOutputStream
// because you set it in the overriden method, afterWrite().
System.out.println("Downloaded bytes : " + ((DownloadCountingOutputStream) e.getSource()).getByteCount());
}
}
public static void main(String[] args) {
URL dl = null;
File fl = null;
String x = null;
OutputStream os = null;
InputStream is = null;
ProgressListener progressListener = new ProgressListener();
try {
fl = new File(System.getProperty("user.home").replace("\\", "/") + "/Desktop/Screenshots.zip");
dl = new URL("http://ds-forums.com/kyle-tests/uploads/Screenshots.zip");
os = new FileOutputStream(fl);
is = dl.openStream();
DownloadCountingOutputStream dcount = new DownloadCountingOutputStream(os);
dcount.setListener(progressListener);
// this line give you the total length of source stream as a String.
// you may want to convert to integer and store this value to
// calculate percentage of the progression.
dl.openConnection().getHeaderField("Content-Length");
// begin transfer by writing to dcount, not os.
IOUtils.copy(is, dcount);
} catch (Exception e) {
System.out.println(e);
} finally {
IOUtils.closeQuietly(os);
IOUtils.closeQuietly(is);
}
}
}
commons-io has IOUtils.copy(inputStream, outputStream). So:
OutputStream os = new FileOutputStream(fl);
InputStream is = dl.openStream();
IOUtils.copy(is, os);
And IOUtils.toByteArray(is) can be used to get the bytes.
Getting the total number of bytes is a different story. Streams don't give you any total - they can only give you what is currently available in the stream. But since it's a stream, it can have more coming.
That's why http has its special way of specifying the total number of bytes. It is in the response header Content-Length. So you'd have to call url.openConnection() and then call getHeaderField("Content-Length") on the URLConnection object. It will return the number of bytes as string. Then use Integer.parseInt(bytesString) and you'll get your total.