How to run external file in java program?

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jacekfoo@gmail.com - 23 Aug 2006 13:14 GMT

Main reason I need this facility is to convert .properties file from
UTF-16 to ISO-8859-1. And I created a very simple program to do this.
Is searches current dir for any files without an extension and then
calls:
Runtime.getRuntime().exec(/*Path to native2ascii*/ + "native2ascii.exe"
+ " " + Command).waitFor(). Where command is string containing
-encoding UTF-16 sourcefile outputfile.
And that command does nothing :(. Can you find error.

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Soren Kuula - 23 Aug 2006 13:30 GMT

> Main reason I need this facility is to convert .properties file from
> UTF-16 to ISO-8859-1. And I created a very simple program to do this.
[quoted text clipped - 3 lines]
> + " " + Command).waitFor(). Where command is string containing
> -encoding UTF-16 sourcefile outputfile

Consider doing the re-coding internally in your Java program instead of
using an external program. I think it will be much less trouble (with
things like the character encoding on streams between your Java program
and the external one...)..

Open a Reader with the source encoding, read the whole file into a
String or StringBuilder. Then, open a Writer with the target enocoding
and write the string back.

Søren

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jacekfoo@gmail.com - 23 Aug 2006 15:16 GMT

> Open a Reader with the source encoding, read the whole file into a
> String or StringBuilder. Then, open a Writer with the target enocoding
> and write the string back.

Didn't do tha job. Id would be good if I converted between UTF-16 and
UTF-8, or anything else. Point is that ISO-8859-1 doesnt support that
chars i want in my files. Native2ascii conwerts them to unicode escape
chars.
ie. (hope servers don't mess it)
Source: alejezuzzy
native2ascii output: \u0163\u02d9 B j e z u z | y
HandConvertedOutput: ???je?uz?y

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Soren Kuula - 24 Aug 2006 02:29 GMT

>>Open a Reader with the source encoding, read the whole file into a
>>String or StringBuilder. Then, open a Writer with the target enocoding
[quoted text clipped - 4 lines]
> chars i want in my files. Native2ascii conwerts them to unicode escape
> chars.

Aah, got it.

If it were me, I would probably just scan through the (properly decoded)
string for chars > 255, and replace then by the escaped value then...
the numerical value of the char is the value you want to print as hex .
with a & in front of it and a ; at the tail.

But OK, if you insist on the external program (after all it works),
sorry I don't know how to make it work reliably from Java.

Søren

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Arne Vajhøj - 24 Aug 2006 02:51 GMT

> Main reason I need this facility is to convert .properties file from
> UTF-16 to ISO-8859-1. And I created a very simple program to do this.
[quoted text clipped - 4 lines]
> -encoding UTF-16 sourcefile outputfile.
> And that command does nothing :(. Can you find error.

The correct form is:

Runtime.getRuntime().exec(new String[] { /*Path to native2ascii*/ +
"native2ascii.exe", "-encoding", "UTF-16", sourcefile,
outputfile}).waitFor()

The one used accidentally works on window,s but it will fail on Linux.

I would suggest you try and get the output from the program:

Process p = Runtime.getRuntime().exec("...");
BufferedReader br = new BufferedReader(new
InputStreamReader(p.getInputStream()));
String line;
while((line = br.readLine()) != null) {
System.out.println(line);
}

and see if there are any clues in the output.

Typical it is a directory problem.

Arne

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jb - 24 Aug 2006 12:05 GMT

> I would suggest you try and get the output from the program:
>
[quoted text clipped - 5 lines]
> System.out.println(line);
> }

OK thanks. I have found a different solution - ResourceBoundle Editor
plugin in Eclipse. But I'll remember that hint next time I'll need to
run some program.

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How to run external file in java program?

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