Develop Reference

I'm trying to lock file exclusively on read

I'm trying to lock a file exclusively on read.
I am using Java 7 on Windows 7.
The files are copied to a directory, and then I want to to read them correctly after copy. That's why I'm trying lock file exclusively on read.
But my program read file in the middle.
Can anyone please help me with this? Thanks!
package test;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
public class FileLockMove {
public static void main(String[] args) {
FileSystem fs = FileSystems.getDefault();
File dir = new File("c:/test_source/");
while(true){
for (File file : dir.listFiles()) {
try (FileChannel fc = (new RandomAccessFile(file, "rw")).getChannel()){
FileLock lock = fc.tryLock();
if(lock != null){
System.out.println("lock is not null\t" + file.getName());
System.out.println("addBody: " + file.getAbsolutePath() + "\t" + file.length());
}else{
System.out.println("lock is null\t" + file.getName());
continue;
}
} catch (Exception e) {
System.out.println("fail:" + file.getName()+"\t" + e.getMessage());
}
try {
Files.move(file.toPath(), fs.getPath("c:/test_dest/",file.getName()));
} catch (IOException e) {
e.printStackTrace();
}
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
Originally, the copy file is not Java, but I created a copy of my program slowly to confirm that I can lock exclusively.
package test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
public class FileCopySlow{
public static void main(String[] args) {
String source = "C:/test_orig/";
String dst ="C:/test_source/";
File file = new File(source);
File[] files = file.listFiles(new FilenameFilter() {
#Override
public boolean accept(File dir, String name) {
if(name.matches(".*\\.bmp")){
return true;
}
return false;
}
});
for(File f: files){
copyStream(f, dst);
}
}
static void copyStream(File source,String dst){
try(BufferedInputStream br = new BufferedInputStream(new FileInputStream(source))){
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dst+source.getName()));
byte[] buff = new byte[100];
int len = -1;
while((len = br.read(buff)) >-1){
out.write(buff,0,len);
out.flush();
Thread.sleep(100);
}
out.close();
System.out.println(source.getName() + "\tfinish");
}catch(Exception e){
e.printStackTrace();
}
}
}

unzipping files in /data/data/ folder - Android Java Programming

How would I programmatically unzip backed up data directly into a /data/data/com.appname folder from the SD Card?
I am able to directly unzip folders in the /data/data/com.appname folder using ES File Explorer, however I need to automate this via the app I'm developing.
I've tried the following code, Unfortunately I am only able to unzip to the SD Card and data folder of my app.
I'm guessing this is due to some form of app/folder security?
MainActivity.java
package fb.ziptester;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void buttonOnClick(View v) {
TextView zipSource = (TextView)findViewById(R.id.zip_source);
TextView zipDest = (TextView)findViewById(R.id.zip_dest);
String sZipSource = "/storage/sdcard1/ACC/BU.zip";
String sZipDest = "/data/data/com.appname/";
zipSource.setText(sZipSource);
zipDest.setText(sZipDest);
UnzipUtility zipUtil = new UnzipUtility();
try {
zipUtil.unzip(sZipSource, sZipDest);
} catch(Exception ex) {
//TODO
}
}
}
package fb.ziptester;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
UnzipUtility.java
public class UnzipUtility {
/**
* Size of the buffer to read/write data
*/
private static final int BUFFER_SIZE = 4096;
/**
* Extracts a zip file specified by the zipFilePath to a directory specified by
* destDirectory (will be created if does not exists)
* #param zipFilePath
* #param destDirectory
* #throws IOException
*/
public void unzip(String zipFilePath, String destDirectory) throws IOException {
File destDir = new File(destDirectory);
if (!destDir.exists()) {
destDir.mkdir();
}
ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath));
ZipEntry entry = zipIn.getNextEntry();
// iterates over entries in the zip file
while (entry != null) {
String filePath = destDirectory + File.separator + entry.getName();
if (!entry.isDirectory()) {
// if the entry is a file, extracts it
extractFile(zipIn, filePath);
} else {
// if the entry is a directory, make the directory
File dir = new File(filePath);
dir.mkdir();
}
zipIn.closeEntry();
entry = zipIn.getNextEntry();
}
zipIn.close();
}
/**
* Extracts a zip entry (file entry)
* #param zipIn
* #param filePath
* #throws IOException
*/
private void extractFile(ZipInputStream zipIn, String filePath) throws IOException {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
byte[] bytesIn = new byte[BUFFER_SIZE];
int read = 0;
while ((read = zipIn.read(bytesIn)) != -1) {
bos.write(bytesIn, 0, read);
}
bos.close();
}
}
Any help would be much appreciated.
Thank you.

Java - how to print the PDF to a specific printer?

I have 5 printers in Windows 8.1 and the PDF file is not in local system its generated in PHP server.
Question. how can i get the PDF file from the server and print to a specific printer?
I am trying with Apache PDFBox 2.0.0
EDIT:
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.print.DocPrintJob;
import javax.print.PrintService;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.printing.PDFPageable;
public class JPrint {
public static boolean saveFile(URL url, String file) throws IOException {
boolean download_status = false;
System.out.println("[OK] - open");
InputStream in = url.openStream();
FileOutputStream fos = new FileOutputStream(new File(file));
System.out.println("[OK] - reading file...");
int length = -1;
byte[] buffer = new byte[1024];
while ((length = in.read(buffer)) > -1) {
fos.write(buffer, 0, length);
}
fos.close();
in.close();
download_status = true;
System.out.println("[OK] - downloaded");
return download_status;
}
public static void main(String[] args) throws IOException, PrinterException {
String downloaded_filename = "C:/Users/tpt/Downloads/pdf.pdf";
String download_pdf_from = "https://github.com/msysgit/msysgit/releases/download/Git-1.9.2-preview20140411/Git-1.9.2-preview20140411.exe";
String downloaded_filename_open_as_pdf = "C:\\Users\\tpt\\Downloads\\pdf.pdf";
String printerNameDesired = "DYMO LabelWriter 450"; // Brother HL-6180DW series
// Get printers
PrintService[] services = PrinterJob.lookupPrintServices();
DocPrintJob docPrintJob = null;
try{
URL url = new URL(download_pdf_from);
if(saveFile(url, downloaded_filename)) {
try {
PDDocument pdf = PDDocument.load(new File(downloaded_filename_open_as_pdf));
PrinterJob job = PrinterJob.getPrinterJob();
for (int i = 0; i < services.length; i++) {
if (services[i].getName().equalsIgnoreCase(printerNameDesired)) {
docPrintJob = services[i].createPrintJob();
}
}
job.setPrintService(docPrintJob.getPrintService());
job.setPageable(new PDFPageable(pdf));
//docPrintJob = service[i].createPrintJob();
job.print();
} catch (Exception e) {
System.out.println("[FAIL]" + e);
}
} else {
System.out.println("[FAIL] - download fail");
}
} catch (Exception ae) {
System.out.println("[FAIL]" + ae);
}
}
}

This gives you back a list of available printers:
PrintService[] services = PrinterJob.lookupPrintServices();
You can loop through this array and select the printer by name (services[i].getName())

java - FTPClient, multithread upload doesn't work.

I am making an application that let's you upload up to 5 files at once to server. I am using apache FTPClient and Filezilla server. when I upload one file at a time it works but when I try to get 2 or more uploads going I get socket exception, the first file that was uploading stops and the new one starts. Here's my UploadThread class:
package uploaduptofive;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import org.apache.commons.net.ftp.FTPClient;
public class ThreadUpload implements Runnable {
FileInputStream inputStream;
long fileLength;
File selFile;
JFrameClass jFrame;
static String fajl;
FTPClient ftpClient;
String ime;
long progress = 0;
int i;
public ThreadUpload(JFrameClass jFrame, FTPClient ftpClient) {
this.jFrame = jFrame;
this.ftpClient = ftpClient;
}
#Override
public synchronized void run() {
i = jFrame.i;
JFileChooser fc = new JFileChooser();
fc.setDialogTitle("Upload file");
fc.setAcceptAllFileFilterUsed(true);
if (fc.showOpenDialog(jFrame) == JFileChooser.APPROVE_OPTION) {
selFile = fc.getSelectedFile();
System.out.println(selFile.length());
Path path = Paths.get(selFile.toString());
fileLength = selFile.length();
fajl = selFile.toString();
ime = selFile.getName();
System.out.println(ime);
try {
upload();
} catch (FileNotFoundException ex) {
Logger.getLogger(ThreadUpload.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ThreadUpload.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
jFrame.indeksProgress[jFrame.i] = -1;
}
}
protected void upload() throws FileNotFoundException, IOException {
File secondLocalFile = new File(fajl);
String secondRemoteFile = ime;
inputStream = new FileInputStream(secondLocalFile);
OutputStream outputStream = ftpClient.storeFileStream(secondRemoteFile);
byte[] bytesIn = new byte[4096];
int read = 0;
jFrame.nizProgress.get(jFrame.indeksProgress[i]).setValue(0);
while ((read = inputStream.read(bytesIn)) != -1) {
outputStream.write(bytesIn, 0, read);
progress = progress + 4096;
System.out.println("" + ((progress * 100 / fileLength)));
jFrame.nizProgress.get(jFrame.indeksProgress[i]).setValue((int) ((progress * 100 / fileLength)));
}
System.out.println("" + ((((progress) / fileLength) * 100)));
jFrame.nizProgress.get(jFrame.indeksProgress[i]).setValue(100);
inputStream.close();
outputStream.close();
boolean completed = ftpClient.completePendingCommand();
if (completed) {
System.out.println("Uploaded!");
}
}
}
I run threads from class name JFrameClass:
Runnable run = new ThreadUpload(JFrameClass.this, ftpClient);
new Thread(run).start();
here is the error I get:
mar 07, 2013 4:39:01 PM uploaduptofive.ThreadUpload run
SEVERE: null
java.net.SocketException: Software caused connection abort: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
at org.apache.commons.net.io.SocketOutputStream.write(SocketOutputStream.java:71)
at uploaduptofive.ThreadUpload.upload(ThreadUpload.java:79)
at uploaduptofive.ThreadUpload.run(ThreadUpload.java:57)
at java.lang.Thread.run(Thread.java:722)
ThreadUpload.java:57 is where upload(); is, and (ThreadUpload.java:79) is where outputStream.write(bytesIn, 0, read); is.

Apparently, you use the same FtpClient for the two upload processes.
You should re-instantiate a new FtpClient to open a new socket and allow several files being downloaded at the same time:
FtpClient ftpClient = new FtpClient() ;
...
//Opens a new socket
ftpClient.connect("ftp.example.com");
...
Runnable run = new ThreadUpload(JFrameClass.this, ftpClient);
new Thread(run).start();

How to unzip a zip folder containing different file formats using Java

I need to unzip a zipped directory containing different files' format like .txt, .xml, .xls etc.
I am able to unzip if the directory contains only .txt files but it fails with other files format. Below is the program that I am using and after a bit of googling, all I saw was similar approach -
import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class ZipUtils {
public static void extractFile(InputStream inStream, OutputStream outStream) throws IOException {
byte[] buf = new byte[1024];
int l;
while ((l = inStream.read(buf)) >= 0) {
outStream.write(buf, 0, l);
}
inStream.close();
outStream.close();
}
public static void main(String[] args) {
Enumeration enumEntries;
ZipFile zip;
try {
zip = new ZipFile("myzip.zip");
enumEntries = zip.entries();
while (enumEntries.hasMoreElements()) {
ZipEntry zipentry = (ZipEntry) enumEntries.nextElement();
if (zipentry.isDirectory()) {
System.out.println("Name of Extract directory : " + zipentry.getName());
(new File(zipentry.getName())).mkdir();
continue;
}
System.out.println("Name of Extract fille : " + zipentry.getName());
extractFile(zip.getInputStream(zipentry), new FileOutputStream(zipentry.getName()));
}
zip.close();
} catch (IOException ioe) {
System.out.println("There is an IoException Occured :" + ioe);
ioe.printStackTrace();
}
}
}
Throws the below exception -
There is an IoException Occured :java.io.FileNotFoundException: myzip\abc.xml (The system cannot find the path specified)
java.io.FileNotFoundException: myzip\abc.xml (The system cannot find the path specified)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:212)
at java.io.FileOutputStream.<init>(FileOutputStream.java:104)
at updaterunresults.ZipUtils.main(ZipUtils.java:43)

When you try to open the file that is going to contain the extracted content, the error occurs.
This is because the myzip folder is not available.
So check if it indeed is not available and create it before extracting the zip:
File outputDirectory = new File("myzip");
if(!outputDirectory.exists()){
outputDirectory.mkdir();
}
As #Perception pointed out in the comments: The output location is relative to the active/working directory. This is probably not very convenient, so you might want to add the extraction location to the location of the extracted files:
File outputLocation = new File(outputDirectory, zipentry.getName());
extractFile(zip.getInputStream(zipentry), new FileOutputStream(outputLocation));
(of course you need also add outputLocation to the directory creation code)

This is a good example in which he showed to unzip all the formats (pdf, txt etc) have look its quite
or you can use this code might work (i haven't tried this)
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class ZipUtils
{
private static final int BUFFER_SIZE = 4096;
private static void extractFile(ZipInputStream in, File outdir, String name) throws IOException
{
byte[] buffer = new byte[BUFFER_SIZE];
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(outdir,name)));
int count = -1;
while ((count = in.read(buffer)) != -1)
out.write(buffer, 0, count);
out.close();
}
private static void mkdirs(File outdir,String path)
{
File d = new File(outdir, path);
if( !d.exists() )
d.mkdirs();
}
private static String dirpart(String name)
{
int s = name.lastIndexOf( File.separatorChar );
return s == -1 ? null : name.substring( 0, s );
}
/***
* Extract zipfile to outdir with complete directory structure
* #param zipfile Input .zip file
* #param outdir Output directory
*/
public static void extract(File zipfile, File outdir)
{
try
{
ZipInputStream zin = new ZipInputStream(new FileInputStream(zipfile));
ZipEntry entry;
String name, dir;
while ((entry = zin.getNextEntry()) != null)
{
name = entry.getName();
if( entry.isDirectory() )
{
mkdirs(outdir,name);
continue;
}
/* this part is necessary because file entry can come before
* directory entry where is file located
* i.e.:
* /foo/foo.txt
* /foo/
*/
dir = dirpart(name);
if( dir != null )
mkdirs(outdir,dir);
extractFile(zin, outdir, name);
}
zin.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
Regards