I'm not experiences with Windows API at all, so please excuse my ignorance.
I want to delete files to the trash. How to do that using JNA and how to detect if this would not be possible, e.g., because the files are located on a network share?
Use com.sun.jna.platform.FileUtils instead of com.sun.jna.platform.win32.W32FileUtils directly.
import java.io.File;
import java.io.IOException;
import com.sun.jna.platform.FileUtils;
public class MoveToTrash {
public static void main(String[] args){
FileUtils fileUtils = FileUtils.getInstance();
if (fileUtils.hasTrash()) {
try {
fileUtils.moveToTrash( new File[] {new File("c:/temp/dummy.txt") });
}
catch (IOException ioe) {
ioe.printStackTrace();
}
}
else {
System.out.println("No Trash available");
}
}
}
Use com.sun.jna.platform.win32.W32FileUtils, which has moveToTrash and hasTrash methods defined.
Related
I'm trying to load a file from resources/ path using
getClassLoader().getResourceAsStream("file.LIB")
but the method always returns null, unless I rename the file into another extension, say ".dll".
I've looked into the official Java documentation, but to no avail.
Why does the method acts strange on that file type?
Note: I'm using JDK 1.8.0_111 x86 (due to constraints on that lib file, which only works well with a 32-bit JVM)
It does works for me, you need to be sure what exactly you are doing with lib file.
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class FileHelper {
public String getFilePathToSave() {
Properties prop = new Properties();
String filePath = "";
try {
InputStream inputStream =
getClass().getClassLoader().getResourceAsStream("abc.lib");
prop.load(inputStream);
filePath = prop.getProperty("json.filepath");
} catch (IOException e) {
e.printStackTrace();
}
return filePath;
}
public static void main(String args[]) {
FileHelper fh = new FileHelper();
System.out.println(fh.getFilePathToSave());
}
}
I am working on an audio player and need to add pause() and play() features in it to connect with JButtons. The problem is I am not able to import Media package as it says package does not exist. I cannot find anywhere it online to download the package. Same goes for AudioPlayer class which gives bad class file error.
you need the JMF libraries , you can get them from there , for windows there is a typic installer :
JMF Download
Based on your question,
You can down load java.media
then use
import javax.media.*;
then you can declare like
Player audioplayer = Manager.createRealizedPlayer(file.toURI().toURL());
And
audioplayer.start(); and audioplayer.stop();
Here file means where the source file saved.
NB: you can use JMF jar file
Try like this
try {
audioplayer = Manager.createRealizedPlayer(file.toURI().toURL());
} catch (IOException ex) {
Logger.getLogger(MY_MP3_PLAYER.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoPlayerException ex) {
Logger.getLogger(MY_MP3_PLAYER.class.getName()).log(Level.SEVERE, null, ex);
} catch (CannotRealizeException ex) {
Logger.getLogger(MY_MP3_PLAYER.class.getName()).log(Level.SEVERE, null, ex);
}
OR Try the sample code given below
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import javax.media.CannotRealizeException;
import javax.media.Manager;
import javax.media.NoPlayerException;
import javax.media.Player;
public class Mp3Player {
public static void main(String[] args) throws IOException, NoPlayerException, CannotRealizeException {
// Source of song file
File f=new File("your path in which mp3 file is saved");
// Create a Player object that realizes the audio
final Player p=Manager.createRealizedPlayer(f.toURI().toURL());
// Start the music
p.start();
// Create a Scanner object for taking input from cmd
Scanner s=new Scanner(System.in);
// Read a line and store it in st
String st=s.nextLine();
// If user types 's', stop the audio
if(st.equals("s"))
{
p.stop();
}
}
}
It is a late answer, but you can use the Maven dependency:
<!-- https://mvnrepository.com/artifact/javax.media/jmf -->
<dependency>
<groupId>javax.media</groupId>
<artifactId>jmf</artifactId>
<version>2.1.1e</version>
</dependency>
Following four packages will solve your problem. They contains most of helpful methods to deal with audio player.
import javazoom.jl.decoder.JavaLayerException;
import javazoom.jl.player.AudioDevice;
import javazoom.jl.player.FactoryRegistry;
import javazoom.jl.player.advanced.AdvancedPlayer;
You can use .stop(), start(), .play() etc. from above packages.
Hope that will help.
Here is my code:
import com.bmc.arsys.api.ARException;
import com.bmc.arsys.api.ARServerUser;
public class ARServer {
public static void main(String[] args) {
ARServerUser ar = new ARServerUser();
ar.setServer("ServerName");
ar.setUser("Username");
ar.setPassword("Password");
ar.connect();
ar.login();
try {
ar.verifyUser();
} catch (ARException e) {
System.out.println(e.getMessage());
}
}
}
I have created build path for this jar file "ardoc7604_build002.jar" but still i am getting errors like:
import com.bmc.arsys.api.ARException can not be resolved
import com.bmc.arsys.api.ARServerUser; can not be resolved
ARserver can not be resolved
ARException can not be resolved to a type.
Thanks in advance for help.
you have put the javadoc jar in your path - you need to use the java api jar instead.
arapi7604_build002.jar
are you Only Java person or do you understand C# aswell if so I can give you some examples
I'm using Watcher in JDK7 which relies on inotify events. If the file is on a NFS, I want my program to fallback and use polling instead. Is there a way to detect if a file is on a remote drive (other than using Runtime.exec and parsing the mount table)? I'm only concerned with Linux compatibility for now.
I suppose one option is to use both inotify and polling when the program starts, but then disable the polling thread if an inotify event for my file is created.
You should be able to get relatively reliable info about the underlying file system type with FileStore.type().
It will definitely tell you if it's an NFS, or CIFS, not sure about other network mount types.
However I have no info about how reliable it is, #hoaz's suggestion to check if events are coming through might be a good idea.
I had the same problem. I have solved it by creating a new thread in de main class and touching the files periodically so a new change event gets fired.
The sample polls the dir for every 10 seconds does a touch.
Here a sample of the code:
package com.ardevco.files;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;
import java.util.ArrayList;
import java.util.List;
public class Touch implements Runnable {
private Path touchPath;
public Touch(Path touchPath) {
this.touchPath = touchPath;
this.checkPath = checkPath;
}
public static void touch(Path file) throws IOException {
long timestamp = System.currentTimeMillis();
touch(file, timestamp);
}
public static void touch(Path file, long timestamp) throws IOException {
if (Files.exists(file)) {
FileTime ft = FileTime.fromMillis(timestamp);
Files.setLastModifiedTime(file, ft);
}
}
List<Path> listFiles(Path path) throws IOException {
final List<Path> files = new ArrayList<>();
try (DirectoryStream<Path> stream = Files.newDirectoryStream(path)) {
for (Path entry : stream) {
if (Files.isDirectory(entry)) {
files.addAll(listFiles(entry));
}
files.add(entry);
}
}
return files;
}
#Override
public void run() {
while (true) {
try {
for (Path path : listFiles(touchPath)) {
touch(path);
}
} catch (IOException e) {
System.out.println("Exception: " + e);
}
try {
Thread.sleep(10000L);
} catch (InterruptedException e) {
System.out.println("Exception: " + e);
}
}
}
}
I've been digging around but can't find anything useful.
I'm working on an Android App.
Basically I have a package and there are three java files in it so far; my main screen page, a settings page and what I have called my 'subs.java' where I am putting useful functions, routines.
What I am trying to do is create this 'subs.java' file where routines that get used in more than one place can be stored.
So I have my main app page and I have a settings page. Both of these 'pages' need to use these common functions.
So I was going to put them in my 'subs.java' so I don't end up doubling up code.
Where I am stuck is now I have this subs.java file how do I link to it ?
In PHP if I want to use another file I just include it and I have access to all it's functions.
I suppose I am trying to build up a library, but Java is new to me.
How then would I do this in Eclipse/Java please ?
Here's my subs file, with some useful functions that I found else where :
package com.example.helloandroid;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import android.app.Activity;
import android.content.Context;
import android.widget.Toast;
public class Subs extends Activity {
// Read settings
public String ReadSettings(Context context){
FileInputStream fIn = null;
InputStreamReader isr = null;
char[] inputBuffer = new char[255];
String data = null;
try {
fIn = openFileInput("settings.dat");
isr = new InputStreamReader(fIn);
isr.read(inputBuffer);
data = new String(inputBuffer);
Toast.makeText(context, "Settings read",Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Settings not read",Toast.LENGTH_SHORT).show();
}
finally {
try {
isr.close();
fIn.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return data;
}
// Save settings
public void WriteSettings(Context context, String data){
FileOutputStream fOut = null;
OutputStreamWriter osw = null;
try {
fOut = openFileOutput("settings.dat",MODE_PRIVATE);
osw = new OutputStreamWriter(fOut);
osw.write(data);
osw.flush();
Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show();
}
finally {
try {
osw.close();
fOut.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
The closest thing to PHP's include in Java is import. Read more about using import and package in Java.
If you've created a project as a package then any class using that package can access any other ones. So if you had SomeFileA.java and it uses package com.something.me, and SomeFileB.java that uses package com.something.me then they can reference each other. Typically Eclipse will auto-add any imports if you just flat out write SomeFileB b = new SomeFileB(); inside SomeFileA. If not you can just do use
import com.something.me.SomeFileB;
You would use the import statement to import your subs class. Then you can refer to any function in the subs class as subs.functionName()
If subs.java is in the same folder as your other java files, you can simply type import subs.
Read more about packages and imports at http://www.particle.kth.se/~lindsey/JavaCourse/Book/Part1/Java/Chapter05/packagesImport.html
What about "import" ? You can import a simple class, not only a library...
Put your common routines as static methods in a class ("MyAppHelper" for example), and call them in your "screens" :
MyAppHelper.function1(...)