使用java创建一个新的目录和一个文件 [英] using java to create a new directory and a file within it

问题描述

我正在尝试在这个目录中创建一个新目录和一个文件，任何人都可以告诉我我在哪里错了。
i am使用Windows系统，我希望该目录存在于我的.JAVA文件的文件夹中。

i am trying to create a new directory and a file with in this directory,can any one tell me where am i going wrong. i am using a windows system and i want the directory to be present in the folder my .JAVA file is present.

   import java.io.*;
   class  PS_Task1
    {
public static void main(String[] args) 
{
    try
    {
    File file = new File("Library\\test.txt");
    file.mkdir();
    file.createNewFile();
    }
    catch(Exception e)
    {
        System.out.println("ecception");
    }


}
}

推荐答案

基本上，发生的是，您正在创建一个名为 Library\test.txt 的目录，然后尝试创建一个新的文件称为相同的东西，这显然不会工作。

Basically, what's happening is, you are creating a directory called Library\test.txt, then trying to create a new file called the same thing, this obviously isn't going to work.

所以，而不是...

File file = new File("Library\\test.txt");
file.mkdir();
file.createNewFile();

尝试...

File file = new File("Library\\test.txt");
file.getParentFile().mkdir();
file.createNewFile();

其他

mkdir 如果失败，实际上不会抛出任何异常，这很烦人，所以我会做一些更像...的

mkdir will not actually throw any kind of exception if it fails, which is rather annoying, so instead, I would do something more like...

File file = new File("Library\\test.txt");
if (file.getParentFile().mkdir()) {
    file.createNewFile();
} else {
    throw new IOException("Failed to create directory " + file.getParent());
}

所以我知道实际的问题是...

Just so I knew what the actual problem was...

其他

创建目录（在此上下文中）将位于您的位置运行程序从...

The creation of the directory (in this context) will be at the location you ran the program from...

例如，您从 C：\MyAwesomJavaProjects\FileTest ，将在此目录中创建库目录（即 C：\MyAwesomJavaProjects\FileTest\Library ）。将其创建在与 .java 文件相同的位置，通常不是一个好主意，因为您的应用程序可能实际上可以捆绑在Jar中。

For example, you run the program from C:\MyAwesomJavaProjects\FileTest, the Library directory will be created in this directory (ie C:\MyAwesomJavaProjects\FileTest\Library). Getting it created in the same location as your .java file is generally not a good idea, as your application may actually be bundled into a Jar later on.

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