Java Examples - Get File Size
Java ExamplesThe following example demonstrates using the file.exists() and file.length() methods of the File class to get the file size, calculated in bytes (1KB = 1024 bytes):
Main.java file
import java.io.File;
public class Main {
public static long getFileSize(String filename) {
File file = new File(filename);
if (!file.exists() || !file.isFile()) {
System.out.println("File does not exist");
return -1;
}
return file.length();
}
public static void main(String[] args) {
long size = getFileSize("c:/java.txt");
System.out.println("The size of java.txt file is:" + size);
}
}
The output of the above code is (the java.txt file is located on the C drive):
java.txt文件大小为: 480Other Extensions