java - 需要帮助解决 FileOutputStream 和 DataOutputStream 上的 IOException

Question

我试图将整数写入文本文件作为保存游戏的方法，但我同时收到 IOException 和 FileNotFound 异常(写在它们出现的行的注释中)。 saveData类存储的是字符统计数据，它们都是整数。我应该怎么做才能修复异常？

Scanner s = new Scanner(System.in);
    Character player = new Character();

    System.out.print("Enter your username: ");
    String user = s.nextLine();
    System.out.print("Give a name to the file: ");
    String filename = s.nextLine();
    s.close();

    Vector<Integer> saveData = new Vector<Integer>();
    saveData.add(player.Int);
    saveData.add(player.Vit);
    saveData.add(player.Str);
    saveData.add(player.Dex);

    FileOutputStream fos = new FileOutputStream("C:\\Users\\" + user + "\\" + filename + ".csv"); //Unhandled exception type FileNotFoundException
    DataOutputStream dos = new DataOutputStream(fos);

    for(int i = 0; i < saveData.size(); i++) {
        dos.writeInt(saveData.get(i)); //Unhandled exception type IOException
    }

    dos.close(); //Unhandled exception type IOException

Answer 1

如果您的user目录不存在，您将收到该异常。应该使用 user.name 来获取当前登录的用户名，而不是询问

尝试以下操作:

String user = System.getProperty("user.name"); //get the current logged in user name

Path path = Paths.get("C:\\Users\\" + user + "\\" + filename + ".csv");

//Try-with-resource will close DOS even upon exception
try(DataOutputStream dos = new DataOutputStream(Files.newOutputStream(path)) {
  for(int i = 0; i < saveData.size(); i++) {
    dos.writeInt(saveData.get(i)); 
  }
} catch (IOException ex) {
  ex.printStackTrace();
}