Apache Commons IO - FileUtils
Provides method to manipulates files like moving, opening, checking existence, reading of file etc. These methods use File Object.
Class Declaration
Following is the declaration for org.apache.commons.io.FileUtils Class −
public class FileUtils
extends Object
Features
- Methods to write to a file.
- Methods to read from a file.
- Methods to make a directory including parent directories.
- Methods to copy files and directories.
- Methods to delete files and directories.
- Methods to convert to and from a URL.
- Methods to list files and directories by filter and extension.
- Methods to compare file content.
- Methods to file last changed date.
- Methods to calculating a checksum.
Example of FileUtils Class
Here is the input file we need to parse −
Welcome to TutorialsPoint. Simply Easy Learning.
IOTester.java
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import org.apache.commons.io.FileUtils;
public class IOTester {
public static void main(String[] args) {
try {
//Using FileUtils
usingFileUtils();
} catch(IOException e) {
System.out.println(e.getMessage());
}
}
public static void usingFileUtils() throws IOException {
//get the file object
File file = FileUtils.getFile("input.txt");
//get the temp directory
File tmpDir = FileUtils.getTempDirectory();
System.out.println(tmpDir.getName());
//copy file to temp directory
FileUtils.copyFileToDirectory(file, tmpDir);
//create a new file
File newTempFile = FileUtils.getFile(tmpDir, file.getName());
//get the content
String data = FileUtils.readFileToString(newTempFile, Charset.defaultCharset());
//print the content
System.out.println(data);
}
}
Output
It will print the following result.
Temp
Welcome to TutorialsPoint. Simply Easy Learning.