How to write values in a properties file through java code

Question

I have an issue.

I have a properties file. I want to store some values in that file and will implement in the code whenever it is required. Is there any way to do that?

I am using Properties class to do that..

Answer 1

Load the properties file using java.util.Properties.

Code snippet -

Properties prop = new Properties();
InputStream in = getClass().getResourceAsStream("xyz.properties");
prop.load(in);

It provides Properties#setProperty(java.lang.String, java.lang.String) which helps to add new property.

Code snippet -

prop.setProperty("newkey", "newvalue");

This new set you can save using Properties#store(java.io.OutputStream, java.lang.String)

Code Snippet -

prop.store(new FileOutputStream("xyz.properties"), null);