You can achieve that like this :
public void saveParamChanges() {
try {
// create and set properties into properties object
Properties props = new Properties();
props.setProperty("Prop1", "toto");
props.setProperty("Prop2", "test");
props.setProperty("Prop3", "tata");
// get or create the file
File f = new File("app-properties.properties");
OutputStream out = new FileOutputStream( f );
// write into it
DefaultPropertiesPersister p = new DefaultPropertiesPersister();
p.store(props, out, "Header COmment");
} catch (Exception e ) {
e.printStackTrace();
}
}
source
EDIT : updated with the defaultPropertiesPersiter from org.springframework.Util
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