Properties file value change

Hi,

I have a situation where I need to change the value of properties file after the successful execution of a program.

I have a filename called myProperties.properties here I have value process.time='03/24/2010' and I have few other values in this property file. What I need to do is change the process.time value after successful execution of a program with out touching other values.

Thanks for your help in advance.

Just read the file into a Properties object, update the property and write it to a file.

I tried in the following way

SystemProperties.properties
### PAWS details
db.username=test
db.password=test

## Export paths
xml.file.recordsPerFile=10

## Process date and time
process.time=test
--------------------------------

Program:
public static void main(String a[]) throws Exception {
		String aPropertiesFileName = "./SystemProperties.properties";
		String errorString;
		Properties loadedProperties;
		FileInputStream fis;

try {
			loadedProperties = new Properties();

fis = new FileInputStream(aPropertiesFileName);

loadedProperties.load(fis);
			fis.close();
			FileOutputStream outfile = new FileOutputStream ( aPropertiesFileName) ;
			System.out.println(loadedProperties.getProperty("process.time"));
			
			loadedProperties.setProperty("process.time", "test");
			loadedProperties.store(outfile, "test");
			System.out.println("After");
			System.out.println(loadedProperties.getProperty("process.time"));
		} catch (FileNotFoundException fnfe) {
			fnfe.printStackTrace();
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}
	}

Output:
db.password=test
process.time=test
db.username=test

The problem is I have some format in the actual file when write the content using ouputstream I lost my format.

Thanks for your help.

That's correct. You'll lose the format but the data is the same.

You could also do it manually. Or you could store that property in a completely separate file and reduce the risk of trashing your properties file. Or put it in a DB, which is where often-changed values really belong, IMO.

I agree but 1 change at the end of the program is not much. I don't think a DB is the solution because then people can't easily read the content and I'm assuming that's what the poster wants because otherwise we wouldn't mind that the format gets ruined.

Hi,

Thanks for your help guys. As per the replies I have created another properties file and always I update this file only.

Thanks
Have a Good day.