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List:       groovy-user
Subject:    Re: [groovy-user] How to easily read from System.in?
From:       Vaclav Pech <vaclav.pech () seznam ! cz>
Date:       2009-06-21 6:52:20
Message-ID: 4A3DD8A4.9010702 () seznam ! cz
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Hello Michael,

you'll have to keep the reader open until you're done processing the input.

System.in.withReader {
    print 'input'
    println it.readLine()

...
//do something else
...

    print 'input'
    println it.readList()
}

Leaving the withReader block closes the stream.

Regards,

Vaclav


MichaelM wrote:
> If I try this idiom in more than one place in my script, it results in
> java.io.IOException: Stream closed.
> Is this a bug, or the expected bahavior? If expected, what is the
> recommended way to get user input at more than one place in the script?
>
> System.in.withReader {
>         print  'input: '
>         println it.readLine()
> } 
>
> // Repeat further down in the script for other input:
>
> System.in.withReader {
>         print  'input: '
>         println it.readLine()
> } 
>
> Caught: java.io.IOException: Stream closed
>  at test$_run_closure2.doCall(test.groovy:10)
>  at test.run(test.groovy:8)
>
>
> Dierk König wrote:
>   
>> a bit more Groovy idiomatic:
>>
>> System.in.withReader {
>> 	print  'input: '
>> 	println it.readLine()
>> }
>>
>> cheers
>> Dierk
>>
>> Am 27.11.2008 um 21:27 schrieb Claus Hausberger:
>>
>>     
>>> Hello
>>>
>>> I want to port some old Perl scripts to Groovy. In those scripts I  
>>> have to read a lot from System.in.
>>>
>>> I got this program working:
>>>
>>>
>>> BufferedReader br = new BufferedReader(new  
>>> InputStreamReader(System.in))
>>> print "input:"
>>> String input = br.readLine()
>>> println "input was:$input:"
>>>
>>>
>>> It does exactly what I want but I wanted to ask if there is a  
>>> shorter, more Groovy way to do this.
>>>
>>>
>>> Claus
>>> -- 
>>> Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit  
>>> allen: http://www.gmx.net/de/go/multimessenger
>>>
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>>>
>>>
>>>       
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>>
>>
>>     
>
>   


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