[英]Can I compose two file paths without needing their toString() methods?
Imagine I have a 'base' path object, denoting a directory, and a 'relative' path object denoting some file within the base. 想象一下,我有一个“基础”路径对象,表示一个目录,一个“相对”路径对象表示基础内的某个文件。
I would expect that code to look somewhat like 我希望代码看起来有点像
AbsolutePath base = new AbsolutePath("/tmp/adirectory");
RelativePath relativeFilePath = new RelativePath("filex.txt");
AbsolutePath absoluteFile = base.append( relativeFilePath );
But in the Java API (which I don't yet know very well) I find only File
, with which I can do nothing better than 但是在Java API(我还不太了解)中,我只找到了
File
,我无法做到这一点
File base = new File("/tmp/adirectory");
File relativeFilePath = new File("filex.txt");
File absoluteFile = base.toString()
+ File.separator
+ relativeFilePath.toString();
Is there a better way? 有没有更好的办法?
The closest you can get with java.io.File
is the File(File, String)
constructor : java.io.File
最接近的是File(File, String)
构造函数 :
File base = ...;
File relative = ...;
File combined = new File(base, relative.toString());
If you can use the Path
class introduced in Java 7, then you can use the resolve()
method , which does exactly what you want: 如果您可以使用Java 7中引入的
Path
类,那么您可以使用resolve()
方法 ,它完全符合您的要求:
Path base = ...;
Path relative = ...;
Path combined = base.resolve(relative);
Please note that if base
is not an absolute path, then combined
won't be absolute either! 请注意,如果
base
不是绝对路径,那么combined
也不是绝对的! If you need an absolute path, then for a File
you'd use getAbsoluteFile()
and for a Path
you'd use toAbsoutePath()
. 如果您需要绝对路径,那么对于
File
您将使用getAbsoluteFile()
而对于您将使用toAbsoutePath()
的Path
。
Yes. 是。
new File(base, "filex.txt")
will create a file names "filex.txt" in the directory base. new File(base, "filex.txt")
将在目录库中创建文件名“filex.txt”。
There is no need to create a relativeFilePath
File instance with just the relative name if what you want to do is make it relative to another directory than the current one. 如果您要执行的操作是使其相对于当前目录而不是另一个目录,则无需仅使用相对名称创建
relativeFilePath
文件实例。
how about: 怎么样:
File base = new File("/tmp/adirectory");
File absoluteFile = new File(base, "filex.txt");
EDIT: Too late @JB Nizet pipped me at the post... 编辑:太晚了@JB Nizet在帖子里揍了我一下......
The File class has some constructors which may be of interest to you: File类有一些您可能感兴趣的构造函数:
File base = new File("/tmp/adirectory");
File absolute = new File(base, "filex.txt");
File absolute2 = new File("/tmp/adirectory", "filex.txt");
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