Use of properties class

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ffellico@inwind.it - 31 Dec 2005 08:17 GMT

I have the following Ascii file named wscnt:

#Sat Oct 08 08:34:32 CEST 2005

#contatore progressivo corrente
contatore=0000100

#contatore iniziale
iniziale=0000100

#limite contatore
limite=0000110

I like to read the value of "contatore" wich initially is 0000100

Increment it of 1 unit

and write it back in the file wscnt.

I am able to read it but I am unable to rewrite the file updated.

Can anyone write for me the few correct statements to do this?

Thank you and Happy new year. Franco

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sherazi - 31 Dec 2005 10:10 GMT

Hi Franco ;

String fileName="wscnt.properties";
FileInputStream fis = new FileInputStream(fileName);
Properties prop=new Properties();
prop.load(fis);
fis.close();
prop.setProperty("contatore","0000101");
FileOutputStream fos = new FileOutputStream(fileName);
prop.store(fos,"");
fos.close();

try it it will solve ur problem

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ffellico@inwind.it - 01 Jan 2006 10:00 GMT

Thank you sherazi. Naturally it work!

Before I was uncertain about the statement:
prop.store(fos,"");

because I was dubious on what was necessary to put in the second
parameter!

Happy new year. Franco.

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Roedy Green - 02 Jan 2006 16:15 GMT

> prop.store(fos,"");

Beware. This method scrambled the order, turfs you comments and blank
lines. See http://mindprod.com/jgloss/properties.html

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Roedy Green - 02 Jan 2006 14:58 GMT

On 31 Dec 2005 00:17:46 -0800, "ffellico@inwind.it"
<ffellico@inwind.it> wrote, quoted or indirectly quoted someone who
said :

>I like to read the value of "contatore" wich initially is 0000100
>
[quoted text clipped - 7 lines]
>
>Thank you and Happy new year. Franco

You load the properties, then you put a new value for a property, then
you save the properties as a whole. There is no way to just modify a
little piece of the file.

See http://mindprod.com/jgloss/properties.html

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Use of properties class

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