java - 无论操作系统如何创建文件和文件夹

Question

我写了一个程序，下面是它的一部分。当我在我的电脑上运行它时，它工作得很好。但是当我将此复制到我 friend 的 PC 时，它在第四行显示 FileNotFoundException。

String d = System.getProperty("user.home");
String dir = d + "\\Documents\\CarPark";
new File(dir + "\\abnormal").mkdir();
PrintWriter restoreNo = new PrintWriter(new FileOutputStream(dir + "\\abnormal\\restoreNo.txt"));

谁知道问题出在哪里？谢谢!

Answer 1

将 mkdir 更改为 mkdirs。对于其他操作系统，使用 File.separator 而不是 '\'

String d = System.getProperty("user.home");
String dir = d + File.separator+"Documents"+File.separator+"CarPark";
final File file = new File(dir, "abnormal");
file.mkdirs();// all directories down
PrintWriter restoreNo = new PrintWriter(new FileOutputStream(new File(file, "restoreNo.txt"));

文件分隔符:

The system-dependent default name-separator character, represented as a string for convenience. This string contains a single character, namely separatorChar.

创建目录:

Creates the directory named by this abstract pathname.

mkdirs，来自 JavaDoc:

Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.