在 Ubuntu 中使用 Java 创建文件夹和文件
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Create a folder and a file with Java in Ubuntu
提问by Shahe Masoyan
Here is what I wanna do:
这是我想做的：
- Check if a folder exists
- If it does not exists, create the folder
- If it doest exists do nothing
- At last create a file in that folder
- 检查文件夹是否存在
- 如果不存在，则创建文件夹
- 如果它不存在什么都不做
- 最后在该文件夹中创建一个文件
Everything is working fine in Windows 7, but when I run the application in Ubuntu it doesn't create the folder, it is just creating the file with the folder name, example: (my file name is xxx.xml and the folder is d:\temp, so in Ubuntu the file is generated at d: with the name temp\xxx.xml). Here is my code:
在 Windows 7 中一切正常，但是当我在 Ubuntu 中运行该应用程序时，它不会创建文件夹，它只是使用文件夹名称创建文件，例如：（我的文件名为 xxx.xml，文件夹为 d :\temp，因此在 Ubuntu 中，该文件在 d: 处生成，名称为 temp\xxx.xml）。这是我的代码：
File folder = new File("D:\temp");
if (folder.exists() && folder.isDirectory()) {
} else {
folder.mkdir();
}
String filePath = folder + File.separator;
File file = new File(filePath + "xxx.xml");
StreamResult result = new StreamResult(file);
transformer.transform(source, result);
// more code here
回答by Jean-Rémy Revy
You directory (D:\temp) is nos appropriate on Linux.
您的目录 (D:\temp) 不适用于 Linux。
Please, consider using linux File System, and the File.SEPARATOR constant :
请考虑使用 linux 文件系统和 File.SEPARATOR 常量：
static String OS = System.getProperty("OS.name").toLowerCase();
String root = "/tmp";
if (OS.indexOf("win") >= 0) {
root="D:\temp";
} else {
root="/";
}
File folder = new File(ROOT + "dir1" + File.SEPARATOR + "dir2");
if (folder.exists() && folder.isDirectory()) {
} else {
folder.mkdir();
}
Didn't tried it, but whould work.
没试过，但行得通。
回答by codeMan
D:\tempdoes not exists in linux systems (what I mean is it interprets it as if it were any other foldername)
D:\temp在 linux 系统中不存在（我的意思是它将它解释为任何其他文件夹名称）
In Linux systems the file seperator is /instead of \as in case of Windows
在 Linux 系统中，文件分隔符/代替\了 Windows
so the solution is to :
所以解决方案是：
File folder = new File("/tmp");
instead of
代替
File folder = new File("D:\temp");
回答by Henry
Linux does not use drive letters (like D:) and uses forward slashes as file separator.
Linux 不使用驱动器号（如 D:）并使用正斜杠作为文件分隔符。
You can do something like this:
你可以这样做：
File folder = new File("/path/name/of/the/folder");
folder.mkdirs(); // this will also create parent directories if necessary
File file = new File(folder, "filename");
StreamResult result = new StreamResult(file);
回答by Michael Kazarian
On Unix-like systems no logical discs. You can try create on /tmpor /homeBelow code for create tempdirrectory in your home directory:
在类 Unix 系统上没有逻辑磁盘。您可以尝试在主目录中
创建目录/tmp或/home以下代码temp：
String myPathCandidate = System.getProperty("os.name").equals("Linux")? System.getProperty("user.home"):"D:\";
System.out.println(myPathCandidate);
//Check write permissions
File folder = new File(myPathCandidate);
if (folder.exists() && folder.isDirectory() && folder.canWrite()) {
System.out.println("Create directory here");
} else {System.out.println("Wrong path");}
or, for /tmp- system temp dicecrory. Majority of users can write here:
或者，对于/tmp- 系统临时目录。大多数用户可以在这里写：
String myPathCandidate = System.getProperty("os.name").equals("Linux")? System.getProperty("java.io.tmpdir"):"D:\";
回答by Joop Eggen
回答by Alejandro Ruiz Arias
Consider both solutions using the getProperty static method of System class.
考虑使用 System 类的 getProperty 静态方法的两种解决方案。
String os = System.getProperty("os.name");
if(os.indexOf("nix") >= 0 || os.indexOf("nux") >= 0 || os.indexOf("aix") > 0 ) // Unix
File folder = new File("/home/tmp");
else if(os.indexOf("win") >= 0) // Windows
File folder = new File("D:\temp");
else
throw Exception("your message");
回答by Tarek
Since Java 7, you can use the Filesutility class, with the new Pathclass. Note that exception handling has been omitted in the examples below.
从 Java 7 开始，您可以使用Files实用程序类和新的Path类。请注意，以下示例中省略了异常处理。
// uses os separator for path/to/folder.
Path file = Paths.get("path","to","file");
// this creates directories in case they don't exist
Files.createDirectories(file.getParent());
if (!Files.exists(file)) {
Files.createFile(file);
}
StreamResult result = new StreamResult(file.toFile());
transformer.transform(source, result);
this covers the generic case, create a folder if it doesn't exist and a file on that folder.
这涵盖了一般情况，如果文件夹不存在，则创建一个文件夹，并在该文件夹中创建一个文件。
In case you actually want to create a temporary file, as written in your example, then you just need to do the following:
如果您确实想创建一个临时文件，如您的示例中所写，那么您只需要执行以下操作：
// this create a temporary file on the system's default temp folder.
Path tempFile = Files.createTempFile("xxx", "xml");
StreamResult result = new StreamResult(Files.newOutputStream(file, CREATE, APPEND, DELETE_ON_CLOSE));
transformer.transform(source, result);
Note that with this method, the file name will not correspond exactly to the prefix you used (xxx, in this case).
请注意，使用此方法，文件名将与您使用的前缀（xxx在本例中为 ）不完全对应。
Still, given that it's a temp file, that shouldn't matter at all. The DELETE_ON_CLOSE guarantees that the file will get deleted when closed.
尽管如此，鉴于它是一个临时文件，这根本无关紧要。DELETE_ON_CLOSE 保证文件在关闭时将被删除。
