I have researched and tried to refer back to my fileChooser.getSeletedFile() in my save as action but can not work out how to check whether or not a file has been created. Here is my attempted code so far:
Save as code(works well):
public void Save_As() {
fileChooserTest.setApproveButtonText("Save");
int actionDialog = fileChooserTest.showOpenDialog(this);
File fileName = new File(fileChooserTest.getSelectedFile() + ".txt");
try {
if (fileName == null) {
return;
}
BufferedWriter outFile = new BufferedWriter(new FileWriter(fileName));
outFile.write(this.jTextArea2.getText());//put in textfile
outFile.flush(); // redundant, done by close()
outFile.close();
} catch (IOException ex) {
}
}
"Save" code doesn't work:
private void SaveActionPerformed(java.awt.event.ActionEvent evt) {
File f = fileChooserTest.getSelectedFile();
try {
if (f.exists()) {
BufferedWriter bw1 = new BufferedWriter(new FileWriter(fileChooserTest.getSelectedFile() + ".txt"));
bw1 = new BufferedWriter(new FileWriter(fileChooserTest.getSelectedFile() + ".txt"));
String text = ((JTextArea) jTabbedPane1.getSelectedComponent()).getText();
bw1.write(text);
bw1.close();
} else {
Save_As();
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
Instead of storing an instance to the JFileChooser rather store an instance to the File (wich will be null before any save has been performed). In your SaveActionPerformed method check if the file is null. If it is null then do a Save_As and store the selected file in your file variable, if it is not null then do a normal save into the file.
Related
This is re-worded from a previous question (which was probably a bit unclear).
I want to download a text file via FTP from a remote server, read the contents of the text file into a string and then discard the file. I don't need to actually save the file.
I am using the Apache Commons library so I have:
import org.apache.commons.net.ftp.FTPClient;
Can anyone help please, without simply redirecting me to a page with lots of possible answers on?
Not going to do the work for you, but once you have your connection established, you can call retrieveFile and pass it an OutputStream. You can google around and find the rest...
FTPClient ftp = new FTPClient();
...
ByteArrayOutputStream myVar = new ByteArrayOutputStream();
ftp.retrieveFile("remoteFileName.txt", myVar);
ByteArrayOutputStream
retrieveFile
Normally I'd leave a comment asking 'What have you tried?'. But now I'm feeling more generous :-)
Here you go:
private void ftpDownload() {
FTPClient ftp = null;
try {
ftp = new FTPClient();
ftp.connect(mServer);
try {
int reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
throw new Exception("Connect failed: " + ftp.getReplyString());
}
if (!ftp.login(mUser, mPassword)) {
throw new Exception("Login failed: " + ftp.getReplyString());
}
try {
ftp.enterLocalPassiveMode();
if (!ftp.setFileType(FTP.BINARY_FILE_TYPE)) {
Log.e(TAG, "Setting binary file type failed.");
}
transferFile(ftp);
} catch(Exception e) {
handleThrowable(e);
} finally {
if (!ftp.logout()) {
Log.e(TAG, "Logout failed.");
}
}
} catch(Exception e) {
handleThrowable(e);
} finally {
ftp.disconnect();
}
} catch(Exception e) {
handleThrowable(e);
}
}
private void transferFile(FTPClient ftp) throws Exception {
long fileSize = getFileSize(ftp, mFilePath);
InputStream is = retrieveFileStream(ftp, mFilePath);
downloadFile(is, buffer, fileSize);
is.close();
if (!ftp.completePendingCommand()) {
throw new Exception("Pending command failed: " + ftp.getReplyString());
}
}
private InputStream retrieveFileStream(FTPClient ftp, String filePath)
throws Exception {
InputStream is = ftp.retrieveFileStream(filePath);
int reply = ftp.getReplyCode();
if (is == null
|| (!FTPReply.isPositivePreliminary(reply)
&& !FTPReply.isPositiveCompletion(reply))) {
throw new Exception(ftp.getReplyString());
}
return is;
}
private byte[] downloadFile(InputStream is, long fileSize)
throws Exception {
byte[] buffer = new byte[fileSize];
if (is.read(buffer, 0, buffer.length)) == -1) {
return null;
}
return buffer; // <-- Here is your file's contents !!!
}
private long getFileSize(FTPClient ftp, String filePath) throws Exception {
long fileSize = 0;
FTPFile[] files = ftp.listFiles(filePath);
if (files.length == 1 && files[0].isFile()) {
fileSize = files[0].getSize();
}
Log.i(TAG, "File size = " + fileSize);
return fileSize;
}
You can just skip the download to local filesystem part and do:
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(server, port);
ftpClient.login(user, pass);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
InputStream inputStream = ftpClient.retrieveFileStream("/folder/file.dat");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "Cp1252"));
while(reader.ready()) {
System.out.println(reader.readLine()); // Or whatever
}
inputStream.close();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
try {
if (ftpClient.isConnected()) {
ftpClient.logout();
ftpClient.disconnect();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
Followed Professor Manning's suggestion to use the ProtobufAnnotationSerializer and did something wrong.
used serializer.writeCoreDocument on the correctly working document; Later read written file with pair = serializer.read; then used pair.second InputStream p2 = pair.second; p2 was empty resulting in a null pointer when running Pair pair3 = serializer.read(p2);
public void writeDoc(CoreDocument document, String filename ) {
AnnotationSerializer serializer = new
ProtobufAnnotationSerializer();
FileOutputStream fos = null;
try {
OutputStream ks = new FileOutputStream(filename);
ks = serializer.writeCoreDocument(document, ks);
ks.flush();
ks.close();
}catch(IOException ioex) {
logger.error("IOException "+ioex);
}
}
public void ReadSavedDoc(String filename) {
// Read
byte[]kb = null;
try {
File initialFile = new File(filename);
InputStream ks = new FileInputStream(initialFile);
ProtobufAnnotationSerializer serializer = new
ProtobufAnnotationSerializer();
InputStream kis = new
ByteArrayInputStream(ks.readAllBytes());
ks.close();
Pair<Annotation, InputStream> pair = serializer.read(kis);
InputStream p2 = pair.second;
int nump2 = p2.available();
logger.info(nump2);
byte[] ba = p2.readAllBytes();
Annotation readAnnotation = pair.first;
Pair<Annotation, InputStream> pair3 = serializer.read(p2);
kis.close();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (ClassCastException e) {
e.printStackTrace();
} catch(Exception ex) {
logger.error("Exception: "+ex);
ex.printStackTrace();
}
}
This line is unnecessary and should be deleted:
Pair<Annotation, InputStream> pair3 = serializer.read(p2);
If you have set up readAnnotation correctly that's the end of the read/write process. p2 is empty because you have read all its contents already.
There is a clear example of how to use serialization here:
https://github.com/stanfordnlp/CoreNLP/blob/master/itest/src/edu/stanford/nlp/pipeline/ProtobufSerializationSanityITest.java
You will have to also build a CoreDocument from an Annotation.
CoreDocument readDocument = new CoreDocument(readAnnotation);
String targetRptFile = System.getenv("LOCAL_BIRT_INPUT") + "/"+report.getMergeRptTemplates().getTargetTemplate()+".rptdesign";
String attachRptFile = System.getenv("LOCAL_BIRT_INPUT") + "/"+report.getMergeRptTemplates()
.getAttachTemplate()+".rptdesign";
DesignConfig dConfig = new DesignConfig();
IDesignEngineFactory factory = (IDesignEngineFactory) Platform.createFactoryObject(IDesignEngineFactory.EXTENSION_DESIGN_ENGINE_FACTORY);
IDesignEngine dEngine = factory.createDesignEngine(dConfig);
SessionHandle session = dEngine.newSessionHandle(null);
ReportDesignHandle targetRptDesignHandle = null;
ReportDesignHandle attachRptDesignHandle = null;
try {
targetRptDesignHandle = session.openDesign(targetRptFile);
attachRptDesignHandle = session.openDesign(attachRptFile);
} catch (DesignFileException e) {
e.printStackTrace();
}
OdaDataSourceHandle attachOdaDataSourceHandle = (OdaDataSourceHandle)attachRptDesignHandle.getAllDataSources()
.get(0);
targetRptDesignHandle.getAllDataSources().add(attachOdaDataSourceHandle);
String newTargetRptFile = System.getenv("LOCAL_BIRT_INPUT") + "/"+report
.getMergeRptTemplates().getTargetTemplate()+"-merge"+".rptdesign";
try {
targetRptDesignHandle.saveAs(newTargetRptFile);
targetRptDesignHandle.close();
attachRptDesignHandle.close();
session.closeAll(true);
} catch (IOException e) {
e.printStackTrace();
}
}
Never did this, but I remember a similar problem when I wanted to copy a JDBCDataSource. I worked around this by setting all the properties manually instead of trying to copy the whole DS.
In my spring-batch-integration app, file polling invokes the batchjob for eachfile and this application could be running on multiple servers(nodes) but they all are supposed to read a common directory.Now, I wrote a custom locker which takes the lock on file so that any other instance will not be able to process the same file . code as below
public class MyFileLocker extends AbstractFileLockerFilter{
private final ConcurrentMap<File, FileLock> lockCache = new ConcurrentHashMap<File, FileLock>();
private final ConcurrentMap<File, FileChannel> ChannelCache = new ConcurrentHashMap<File, FileChannel>();
#Override
public boolean lock(File fileToLock) {
FileChannel channel;
FileLock lock;
try {
channel = new RandomAccessFile(fileToLock, "rw").getChannel();
lock = channel.tryLock();
if (lock == null || !lock.isValid()) {
System.out.println(" Problem in acquiring lock!!" + fileToLock);
return false;
}
lockCache.put(fileToLock, lock);
ChannelCache.put(fileToLock, channel);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
#Override
public boolean isLockable(File file) {
return file.canWrite();
}
#Override
public void unlock(File fileToUnlock) {
FileLock lock = lockCache.get(fileToUnlock);
try {
if(lock!=null){
lock.release();
ChannelCache.get(fileToUnlock).close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Now, when i invoke my Spring batch and i try to read that file using flatfileitemreader it gives me
org.springframework.batch.item.file.NonTransientFlatFileException
which i believe is coming beacuse file is locked. I did some googling and found that NIOLocker locks the file in a way that even the current thread can't read it. I found a link where it shows how to read the locked file but they are using buffer.
How can I make my file accessible to my FlatfileItemReader.
Please suggest.
Yes, you really can get access to the locked file content only over ByteBuffer:
FileChannel fileChannel = channelCache.get(lockedFile);
ByteBuffer byteBuffer = ByteBuffer.allocate((int) fileChannel.size());
fileChannel.read(byteBuffer);
System.out.println("Read File " + lockedFile.getName() + " with content: " + new String(byteBuffer.array()));
Oh! Yeah. You really pointed to my repo :-).
So, with locker you don't have choice unless copy/paste the file byte[] that way before FlatfileItemReader or just inject some custom BufferedReaderFactory into the same FlatfileItemReader, which converts the locked file to the appropriate BufferedReader:
new BufferedReader(new CharArrayReader(byteBuffer.asCharBuffer().array()));
Based on the link that you shared, looks like you could try the following.
//This is from your link (except the size variable)
FileChannel fileChannel = channelCache.get(lockedFile);
int size = (int) fileChannel.size();
ByteBuffer byteBuffer = ByteBuffer.allocate(size);
fileChannel.read(byteBuffer);
//Additional code that you could try
byte[] bArray = new byte[size];
//Write data to the byte array
byteBuffer.get(bArray);
FlatFileItemReader flatFileItemReader = new FlatFileItemReader();
flatFileItemReader.setResource(new ByteArrayResource(bArray));
//Next you can try reading from your flatFileItemReader as usual
...
Let me know if it doesn't progress your issue.
Solution : I am creating a temporary file with content of the locked file and processing it. Once processing is done i archive that file and remove the locked and temporary both files. Key here is to create a new file with locked file content. code for below is as follows :
File tmpFile = new File(inputFile.getAbsolutePath() + ".lck");
FileChannel fileChannel = MyFileLocker.getChannelCache().get(new File(inputFile.getAbsolutePath()));
InputStream inputStream = Channels.newInputStream(fileChannel);
ByteStreams.copy(inputStream, Files.newOutputStreamSupplier(tmpFile));
Here inputFile is my locked file and tmp file is new file with locked file content. I have also created a method in my locker class to unlock and delete
public void unlockAndDelete(File fileToUnlockandDelete) {
FileLock lock = lockCache.get(fileToUnlockandDelete);
String fileName = fileToUnlockandDelete.getName();
try {
if(lock!=null){
lock.release();
channelCache.get(fileToUnlockandDelete).close();
//remove from cache
lockCache.remove(fileToUnlockandDelete);
channelCache.remove(fileToUnlockandDelete);
boolean isFiledeleted = fileToUnlockandDelete.delete();
if(isFiledeleted){
System.out.println("File deleted successfully" + fileName);
}else{
System.out.println("File is not deleted."+fileName);
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
I'm trying to Open the CMD Using java + Applying code to it to open an .jar so the applications output is shown in the .bat file.
can someone tell me how to do it?
This is the code it got,it does run excecute the file but the CMD doesnt show.
btnTest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String Bat = "C:"+File.separatorChar+"Users"+File.separatorChar+"Gebruiker"+File.separatorChar+"AppData"+File.separatorChar+"Local"+File.separatorChar+"Temp"+File.separatorChar+"hexT"+File.separatorChar+"run.bat";
Runtime rt = Runtime.getRuntime();
try {
rt.exec(Bat);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
Edited: This works for me:
String Bat = "C:\\app.bat"; //Try to use \\ as path seperator
try {
Runtime.getRuntime().exec("cmd /c start " + Bat);
} catch (IOException e) {
e.printStackTrace();
}
Define this :
FileWriter writer;
then in your try/catch do the following :
try {
writer = new FileWriter("test.txt");
Process child = rt.exec(Bat);
InputStream input = child.getInputStream();
BufferedInputStream buffer = new BufferedInputStream(input);
BufferedReader commandResult = new BufferedReader(new InputStreamReader(buffer));
String line = "";
try {
while ((line = commandResult.readLine()) != null) {
writer.write(line + "\n");
}
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
This will read the output as a buffer line by line and write it into a text file