Read and update a ini file

[eranga262154]

Hi all.

I want to read and update a ini file to do some processing. Here is what I have try.

public static void main(String[] args) {
        // TODO code application logic here
        new ReadINIFile().readIt();
        //new ReadINIFile().writeIt();
    }
    
    private void readIt() {
        try {
            Properties pro = new Properties();
            pro.load(new FileInputStream("temp.ini"));
            
        // Try to display them          
            System.out.println("Key is: " + pro.getProperty("Key"));            
            System.out.println("Here is: " + pro.getProperty("Here"));
            
        }
        catch(Exception ex) {
            System.out.println(ex.getMessage());
        }
    }
    
    private void writeIt() {
        // Try to update values
        try {
            Properties pri = new Properties();
            pri.store(new FileOutputStream("temp.ini"), "Just a comment");
            pri.setProperty("Here", "New");
            
        }
        catch(IOException ioe) {
            System.out.println(ioe.getMessage());
        }
    }

Reading part is ok, it's read all data I want. When I write all content of the ini file is deleted and following is the content.

#Just a comment
#Fri May 09 10:41:51 IST 2008

Can anyone of you tell me where I'm going wrong. Here is the structure of the ini file.

[Head]
Text=Java
Key=14
Name=Old
[More]
Here=New

[mukulbhave]

Hi , The problem is obvious, you are opening up a file for overwriting. so you need to open for appending. Use the FileOutputStream constructor that takes an additional boolen parameter e.g.

pri.store(new FileOutputStream("temp.ini",true), "Just a comment");

It will work as expected. Also whenever you open up a stream do close it when workl is done. hope this helps

[eranga262154]

It's wrong pal. If I append the file, what happened if my application runs thousand times. It's obvious right?

[mukulbhave]

I dont get you . It depends what you are trying to achieve. Nothing is wrong here

[Ezzaral]

Set your property values before you write it to the file. Setting values on the Properites object after you wrote it isn't going to update the file for you.

[jwenting]

And do realise that there is no such thing as a section header ("[xxxxx]") in a Java Properties file so those parts won't be persisted (in fact you can't even add them to a Properties object).

[sridharjakkula]

store the file after setting properties. It works.

Properties pri = new Properties();pri.setProperty("Here", "New");
pri.store(new FileOutputStream("temp.ini"), "Just a comment");

If you want add new properties, open output file stream in append mode.
If you want to update existing keys, wrap proper logic around.

Cheers,
Sridhar

Hi all.

I want to read and update a ini file to do some processing. Here is what I have try.

public static void main(String[] args) {
        // TODO code application logic here
        new ReadINIFile().readIt();
        //new ReadINIFile().writeIt();
    }
    
    private void readIt() {
        try {
            Properties pro = new Properties();
            pro.load(new FileInputStream("temp.ini"));
            
        // Try to display them          
            System.out.println("Key is: " + pro.getProperty("Key"));            
            System.out.println("Here is: " + pro.getProperty("Here"));
            
        }
        catch(Exception ex) {
            System.out.println(ex.getMessage());
        }
    }
    
    private void writeIt() {
        // Try to update values
        try {
            Properties pri = new Properties();
            pri.store(new FileOutputStream("temp.ini"), "Just a comment");
            pri.setProperty("Here", "New");
            
        }
        catch(IOException ioe) {
            System.out.println(ioe.getMessage());
        }
    }

Reading part is ok, it's read all data I want. When I write all content of the ini file is deleted and following is the content.

#Just a comment
#Fri May 09 10:41:51 IST 2008

Can anyone of you tell me where I'm going wrong. Here is the structure of the ini file.

[softswing]

Hai friends, same problem comes for me also, how i do this?

[Boazb]

try this to read windows ini files in java:
http://ini4j.sourceforge.net/
Cheers,
Boaz.

[softswing]

Hi Boazb , Thanks for your information, am used ini4j only for this problem.
Thankyou.

[riahc3]

try this to read windows ini files in java:
http://ini4j.sourceforge.net/
Cheers,
Boaz.

Does this process Unicode text (accents and such)?