import java.io.File; import java.io.IOException; public class TestFile { public static void main(String[] args) { String separator = File.separator; String fileName = "myfile.txt"; String directory = "mydir1" + separator + "mydir2"; File f = new File(directory, fileName); if (f.exists()) { System.out.println("文件名：" + f.getAbsolutePath()); System.out.println("文件大小：" + f.length()); } else { f.getParentFile().mkdirs(); try { f.createNewFile(); } catch (IOException e) { System.out.println(e.getMessage()); } } } }