Develop Reference

Copy all the files from a directory to another

i'm trying to copy all the files inside a directory to another(but i want it to not copy the folders). I'm trying to use Files.copy but i'm getting this error:
Exception in thread "main" java.nio.file.FileAlreadyExistsException:
Here's my actual code:
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Exercici1 {
public static void copiarArchivos(String pathSource,String pathOutcome, String sufix) throws IOException {
File origen = new File(pathSource);
String[] contenidoOrigen = origen.list();
for(String string:contenidoOrigen){
File interno = new File(origen,string);
if (interno.isDirectory()){
copiarArchivos(interno.getPath(),pathOutcome,sufix);
} else {
Path targetOutcome = Paths.get(pathOutcome);
Path targetSource = Paths.get(interno.getPath());
Files.copy(targetSource,targetOutcome);
}
}
}
public static void main(String[] args) throws IOException {
copiarArchivos("Vampiro_Mascarada","pruebaPDF",".pdf");
}
}
My folder structure is like this:
/out
/pruebasPDF
/src
/Vampiro_Mascarada
/1.pdf
/2.pfdf
/Images
/1.png
/2.png

You need to use to Files.copy(source,dest,CopyOption) with the REPLACE_EXISTING option.

How to successfully return the metadata off of an mp3 file while avoiding a null pointer exception

When I attempt to run the program that takes the metadata and prints it from an mp3 file, I am returned with an "Exception in thread "main" java.lang.NullPointerException at project.mp3MetaData.main(musicdj.java:18)". For this class you need the jid3lib jar. How do I avoid this exception and do I need to pass any variables through the tags at the bottom?
package 1234;
import java.io.File;
import java.io.IOException;
import org.farng.mp3.MP3File;
import org.farng.mp3.TagException;
import org.farng.mp3.id3.ID3v1;
public class mp3MetaData {
public static void main(String[] args) throws IOException, TagException {
// TODO Auto-generated method stub
File sourceFile = new File("/Users/JohnSmith/Desktop/MusicTester/1234.mp3");
MP3File mp3file = new MP3File(sourceFile);
ID3v1 tag = mp3file.getID3v1Tag();
System.out.println(tag.getAlbum());
System.out.println(tag.getAlbumTitle());
System.out.println(tag.getTitle());
System.out.println(tag.getComment());
}
}
Any help will be greatly appreciated.

Your MP3 file might not contain an ID3 tag. So check whether tag is null or not, before using it. Something like this:
public static void main(String[] args) throws IOException, TagException
{
File sourceFile = new File("/Users/JohnSmith/Desktop/MusicTester/1234.mp3");
final MP3File mp3file = new MP3File(sourceFile);
final ID3v1 tag = mp3file.getID3v1Tag();
if (null == tag)
{
System.out.println("No ID3 tag found!");
}
else
{
System.out.println(tag.getAlbum());
System.out.println(tag.getAlbumTitle());
System.out.println(tag.getTitle());
System.out.println(tag.getComment());
}
}

JAVE Library for Mac

I'm actually trying to launch my Unix code on my Mac.
I know that I have to build ffmpeg on my Mac.
I used a Github script for that :
Script
My code :
package test1;
import it.sauronsoftware.jave.*;
import test1.MyFFMPEGExecutableLocator;
import java.io.*;
public class Test1 {
public static void main (String[] zero) throws IllegalArgumentException, InputFormatException, EncoderException{
File source = new File("/Users/Mokeight/Desktop/Test2.mp3");
File target = new File("/Users/Mokeight/Desktop/target2.wav");
System.out.println("START");
AudioAttributes audio = new AudioAttributes();
EncodingAttributes attrs = new EncodingAttributes();
//codec de wav
audio.setCodec("pcm_s16le");
attrs.setFormat("wav");
attrs.setAudioAttributes(audio);
//System.out.println(new MyFFMPEGExecutableLocator().toString());
Encoder encoder = new Encoder(new MyFFMPEGExecutableLocator());
encoder.encode(source, target, attrs);
System.out.println("END");
}
}
My second class is :
package test1;
import it.sauronsoftware.jave.FFMPEGLocator;
public class MyFFMPEGExecutableLocator extends FFMPEGLocator{
#Override
protected String getFFMPEGExecutablePath() {
// TODO Auto-generated method stub
String path = "/Users/Mokeight/Desktop/ffmpeg_mac/ffmpeg-build/workspace/bin/ffmpeg" ;
return path;
}
}
When i'm running that , i have this error :
START
Exception in thread "main" it.sauronsoftware.jave.EncoderException: Metadata:
at it.sauronsoftware.jave.Encoder.encode(Encoder.java:863)
at it.sauronsoftware.jave.Encoder.encode(Encoder.java:713)
at test1.Test1.main(Test1.java:27)
Please, help
Thanks !!

Where does Java save files to?

I ran the below code and created a file. Where can I find it in my filesystem?
import java.io.*;
public class FileReaderDemo {
public static void main(String args[]) throws Exception {
File f = new File ("wayback.txt");
f.createNewFile();
System.out.println(f.exists());
}
}

Add the following to your program, run it and it'll show you the expected location:
System.out.println(f.getCanonicalFile());

Accessing resource from a jar shared library

From test.java, how can I access for reading the Contact.xml file located in the contacts.jar library ?
The bellow code returns null.
package views;
import fr.hznteam.contacts.Contact;
import fr.hznteam.errors.ResourceException;
import java.io.InputStream;
public class Test {
private static final String TAG = "Test ";
public static void main(String[] args) throws ResourceException {
InputStream is = Contact.class.getResourceAsStream("/fr/hznteam/contacts/sql/Contact.xml");
System.out.println(TAG + "resource from jar " + is);
}
The package structure :

this works (see above comment). Inside an object instance use
getClass().getResourceAsStream("/absolute/class_path/to/resource.file"))