Comments on: How to Read/Write Java Properties Files

By: Ciaran

Ciaran — Thu, 06 May 2010 17:19:57 +0000

After I load the properties from the classpath I’m getting the BOM characters ï»¿ appended to the start – meaning when I try and use getProperty() for my first property I get null returned – any ideas what I’m doing wrong here??

By: LATESH

LATESH — Tue, 04 May 2010 17:22:05 +0000

import java.io.*;
import java.util.*;

public class WriteProperty{
String str, key, val;
public static void main(String[] args) {
WriteProperty w = new WriteProperty();
}
public WriteProperty(){
try{
int check=0;
while(check == 0){
check=1;
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
System.out.println(“Enter file name which has properties extension:”);
str = bf.readLine();
Properties pro = new Properties();
File f = new File(str + “.properties”);
if(!f.exists()){
check=0;
System.out.println(“File not found!”);
}
else{
FileInputStream in = new FileInputStream(f);
pro.load(in);
System.out.print(“Enter Key : “);
key = bf.readLine();
System.out.print(“Enter Value : “);
val = bf.readLine();
pro.setProperty(key, val);
pro.store(new FileOutputStream(str + “.properties”),null);
System.out.println(“Operation completly successfuly!”);
}
}
}
catch(IOException e){
System.out.println(e.getMessage());
}
}
}

By: Nischal Shetty

Nischal Shetty — Mon, 12 Apr 2010 07:16:32 +0000

Phew! that helped me, thnks a lot

By: Kovid

Kovid — Tue, 02 Mar 2010 17:33:04 +0000

I don’t understand this. How do I create a .properties file?
Its not making sense to me. Thanks in advance,
Kovid

By: Sandeep

Sandeep — Wed, 03 Feb 2010 02:57:20 +0000

Thank you very much,it helped me a lot

By: John, the Fisherman

John, the Fisherman — Mon, 11 Jan 2010 04:08:50 +0000

Saved my day! I was having problems trying to load the file using a relative path in my web app. Also, I did not remeber the existence of the Properties class.

By: ravil

ravil — Thu, 10 Dec 2009 16:16:55 +0000

Thanks a lot for your brief instructions. The are very helpful!!

By: ranganath

ranganath — Thu, 10 Dec 2009 06:22:20 +0000

read worth.

By: nagarajan

nagarajan — Wed, 30 Sep 2009 08:33:40 +0000

finding the path of the property file in web application is explained very well.Thanks!

By: admin

admin — Thu, 27 Nov 2008 15:10:34 +0000

Actually is not possible to write properties files in classpath, because the properties are picked up by jvm and they are read as resources. It’s the JVM to control when they are loaded and once loaded they are reloaded. In less words, it’s not possible as I know.

Of course you can modify the files, but not using them as classpath resources, and you can not use the reading methods I described earlier;l sorry for the misleading title.

Initially I intended to put all the read/write methods for property files but I ended putting only those I’m using.