我想在具有Java的计算机的目录中创建一个文件 [英] I want to create a file in a directory in computers with Java

问题描述

我正在玩游戏，该游戏需要在用户帐户的AppData文件夹中创建一个特定的目录。现在的问题是，由于每个用户不一样，我无法确切地知道放在哪里。这是在Windows上的方式。我想知道我是否应该写一些特殊的东西或者... ...

 文件文件=新建文件（C：\\\ \\Users\\％USER％\\AppData\\Roaming\\ [gameName]）; 
  

是否有一些特殊的名称，我必须给％USER％（我刚刚使用作为一个例子），还是有其他的东西我要做？

解决方案

你可以使用APPDATA环境变量，通常是 C：\Users\username\AppData\Roaming

您可以使用System.getenv（）函数获取它：

  String appData = System.getenv（）。get（APPDATA）; 
  

---

编辑： / p>

看这个例子（创建一个目录myGame并在这个目录中创建一个文件myGameFile）。
代码很糟糕，但这只是给你一个如何工作的想法。

  String gameFolderPath，gameFilePath; 
 gameFolderPath = System.getenv（）。get（APPDATA）+\\myGame; 
 gameFilePath = gameFolderPath +\\\mymyGameFile; 
 
文件gameFolder = new File（gameFolderPath）; 
 if（！gameFolder.exists（））{
 //文件夹不存在。创建它
如果（gameFolder.mkdir（））{
 //文件夹创建
文件gameFile =新文件（gameFilePath）; 
 if（！gameFile.exists（））{
 //文件不存在，创建它
 try {
 if（gameFile.createNewFile（））{
 //在％APPDATA％\myGame中创建mGameFile！ 
} 
 else {
 //错误
} 
} catch（IOException ex）{
 //处理这里的异常
} 
} 
 else {
 //文件存在
} 
} 
 else {
 //错误
} 
} 
 else {
 //文件夹存在
} 
  

I'm making a game, and that game requires a certain directory to be made in the AppData folder of the user's account. Now the problem is, I can't exactly know where to put it, as every user is different. This is on windows by the way. I want to know if I should write something special or...

File file = new File("C:\\Users\\%USER%\\AppData\\Roaming\\[gameName]");

Is there some special name that I have to give the "%USER%" (I just used that as an example), or is there something else I gotta do?

解决方案

You can use the APPDATA environment variable which is usually "C:\Users\username\AppData\Roaming"

And you can get it using System.getenv() function :

String appData = System.getenv().get("APPDATA");

---

EDIT :

Look at this example (create a directory "myGame" and create a file "myGameFile" into this directory). The code is awful but it's just to give you an idea of how it works.

String gameFolderPath, gameFilePath;
gameFolderPath = System.getenv().get("APPDATA") + "\\myGame";
gameFilePath = gameFolderPath + "\\myGameFile";

File gameFolder = new File(gameFolderPath);
if (!gameFolder.exists()) {
    // Folder doesn't exist. Create it
    if (gameFolder.mkdir()) {
        // Folder created
        File gameFile = new File(gameFilePath);
        if (!gameFile.exists()) {
            // File doesn't exists, create it
            try {
                if (gameFile.createNewFile()) {
                    // mGameFile created in %APPDATA%\myGame !
                }
                else {
                    // Error
                }
            } catch (IOException ex) {
                // Handle exceptions here
            }
        }
        else {
            // File exists
        }
    }
    else {
        // Error
    }
}
else {
    // Folder exists
}

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