Java IO & NIO - Files.isWritable() Examples

Code Snippets Java IO & NIO Java 


Class:

java.nio.file.Files

java.lang.Objectjava.lang.Objectjava.nio.file.Filesjava.nio.file.FilesLogicBig

Method:

public static boolean isWritable(Path path)

Tests whether a file is writable. This method checks that a file exists and that this Java virtual machine has appropriate privileges that woul

Parameters:
path - the path to the file to check
Returns:
true if the file exists and is writable; false if the file does not exist, write access would be denied because the Java virtual machine has insufficient privileges, or access cannot be determined


Examples


package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class IsWritableExample {

public static void main(String... args) throws IOException {
Path tempFile = Files.createTempFile("test-file", ".txt");
boolean writable = Files.isWritable(tempFile);
System.out.println(writable);
}
}

Output

true




package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.DosFileAttributeView;

public class IsWritableExample2 {

public static void main(String... args) throws IOException {
Path tempFile = Files.createTempFile("test-file", ".txt");
//on windows
DosFileAttributeView fileAttributeView =
Files.getFileAttributeView(tempFile, DosFileAttributeView.class);
fileAttributeView.setReadOnly(true);

//create new Path
Path path = Paths.get(tempFile.toString());
boolean writable = Files.isWritable(path);
System.out.println(writable);
}
}

Output

false




If file is not writable then attempting to write to that file will throw exception.

package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.DosFileAttributeView;

public class IsWritableExample3 {

public static void main(String... args) throws IOException {
Path tempFile = Files.createTempFile("test-file", ".txt");
//on windows
DosFileAttributeView fileAttributeView =
Files.getFileAttributeView(tempFile, DosFileAttributeView.class);
fileAttributeView.setReadOnly(true);

//create new Path
Files.write(tempFile, "some content...".getBytes());
}
}

Output

Caused by: java.nio.file.AccessDeniedException: C:\Users\Joe\AppData\Local\Temp\test-file16696522405727936981.txt
at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:89)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:231)
at java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:434)
at java.base/java.nio.file.Files.newOutputStream(Files.java:218)
at java.base/java.nio.file.Files.write(Files.java:3352)
at com.logicbig.example.files.IsWritableExample3.main(IsWritableExample3.java:24)
... 6 more




See Also