获取文件夹大小

public class Test {
public static void main(String[] args) {

System.out.println(getFileSize(new File("d:/android")));
}

public static long getFileSize(File file) {
long size = 0;

File[] files = file.listFiles();
for (File f : files) {
if (f.isDirectory()) {
size = size + getFileSize(f);
} else {
size = size + f.length();
}
}
return size;
}
}