file.toURI（）返回错误值？

Question

I work in a Java RCP application. I am doing the following lines of code:

File file = new File(location);
String filePath = file.toURI().toString();
Desktop desktop = Desktop.getDesktop();
desktop.browse((new URL(filePath)).toURI());

where location is a String.

When the value of location is: http://www.google.com ,

file.toURI() 

is appending "file:/C:/eclipse%203.7.2/eclipse/" to the value and hence it becomes file:/C:/eclipse%203.7.2/eclipse/http:/www.google.com

But when the value is: C:\\Program Files,

file.toURI() 

is not appending anything and returning the same value correctly.

Is there a limitation related to paths starting with http:// or something. Does anyone have any idea on this ?

Answer 1

java.io.File works with file paths not URLs.

So it transforms the supplied initialization parameters into the representation that is your local file system supports.

"http://" means nothing to your local file system, it's just a file name (well, wrong file name but anyway).

In the first case with " http://www.google.com " it does not see disk drive letter in the supplied value so it is considered as relative path and current working dir absolute path added as a prefix ("user.home" env var if I'm not mistaken).

In the second case, you added an absolute path "C:\\Program Files". It sees disk drive letter inside and there is no sense to add anything as a prefix.

Answer 2

We have 2 types of file locations: relative and absolute. When the location is something like C:\\User in MS Windows or /home in Linux the location is absolute and there is no need to append something at the beginning of them! But when the location is http://google.com the program append your program location at the beginning of it.

I think you need to search about URI and URL . You used them incorrectly!