How to write to windows registry

[123456prakash]

hai,
I am tryng to write installation for an application,which require to set some values in registry using java program.

I have tried using Preference class in java.util.prefs

This allows to write keys and values under the keys

HKEY_LOCAL_MACHINE/software/JavaSoft/Prefs
or
HKEY_CURRENT_USER/software/JavaSoft/Prefs


But i want to write under

HKEY_LOCAL_MACHINE/software/ mycompanyName

Please anyone help me its urgent Is there any api it will be helpful if i get some code samples also.
thank you
prakash

[sicarie]

123456prakash-

I found this link to Sun's site after a quick Google-search of "java write windows registry".

http://forum.java.sun.com/thread.jsp...sageID=3902531

If that doesn't work, it looks like a few others in that search might.

sicarie

[rengaraj]

you can use Package java.util.prefs
here is some code
--

package com.kanad.reg;
import java.util.prefs.*;
 
public class winReg {
Preferences prefs;
String defaultValue = "NA";
String InstalledDate ="",version="";
    public static void main(String[] args)
        {
         com.kanad.reg.winReg wr=new com.kanad.reg.winReg();
         wr.setValue();
         wr.getValue();
        }
    winReg()
    {
        try
        {  
           //HKEY_CURRENT_USER\Software\JavaSoft\Prefs
           //HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs
           prefs= Preferences.userNodeForPackage(com.kanad.reg.winReg.class);//HKEY_CURRENT_USER
//           prefs= Preferences.systemNodeForPackage(com.kanad.reg.winReg.class);//HKEY_LOCAL_MACHINE
        }
        catch (Exception E)
        {
            System.out.println(E);
        }
 
    }//winReg
    public void setValue()
    {
        try
        {
        prefs.put("Installed",new java.util.Date().toString());
        prefs.put("Version","1.0.0");
        }
        catch (Exception E)
        {
            System.out.println(E);
        }
    }
    public void getValue()
    {
         try
         {
               InstalledDate = prefs.get("Installed", defaultValue);
               version= prefs.get("Version", defaultValue);
               System.out.println("Installed "+InstalledDate+"\nVersion "+version);
               prefs.flush();
         }
         catch (Exception E)
         {
             System.out.println(E);
         }
    }
}

In registry search for Prefs
you will have com/kanad/reg key
I don't know whether this code works for linux

[sicarie]

you can use Package java.util.prefs
here is some code
--

package com.kanad.reg;
import java.util.prefs.*;
 
public class winReg {
Preferences prefs;
String defaultValue = "NA";
String InstalledDate ="",version="";
    public static void main(String[] args)
        {
         com.kanad.reg.winReg wr=new com.kanad.reg.winReg();
         wr.setValue();
         wr.getValue();
        }
    winReg()
    {
        try
        {  
           //HKEY_CURRENT_USER\Software\JavaSoft\Prefs
           //HKEY_LOCAL_MACHINE\Software\JavaSoft\Prefs
           prefs= Preferences.userNodeForPackage(com.kanad.reg.winReg.class);//HKEY_CURRENT_USER
//           prefs= Preferences.systemNodeForPackage(com.kanad.reg.winReg.class);//HKEY_LOCAL_MACHINE
        }
        catch (Exception E)
        {
            System.out.println(E);
        }
 
    }//winReg
    public void setValue()
    {
        try
        {
        prefs.put("Installed",new java.util.Date().toString());
        prefs.put("Version","1.0.0");
        }
        catch (Exception E)
        {
            System.out.println(E);
        }
    }
    public void getValue()
    {
         try
         {
               InstalledDate = prefs.get("Installed", defaultValue);
               version= prefs.get("Version", defaultValue);
               System.out.println("Installed "+InstalledDate+"\nVersion "+version);
               prefs.flush();
         }
         catch (Exception E)
         {
             System.out.println(E);
         }
    }
}

In registry search for Prefs
you will have com/kanad/reg key
I don't know whether this code works for linux

Probably not, as Linux doesn't have a registry. (Unless a program such as Symantec specifically creates it).

[jetblackstar]

Actually i believe Linux is covered. Wonders of the Abstract Java concept.
For the UserRoot for package it stores them in a hidden .java folder using the package as a series of directories in the users home directory.
For System i believe it stores it in /etc but not 100% sure of the latter.

I was pleasantly surprised when one of our apps just "worked" on Linux.
The only thing that didn't was running up .csv files in the default because it executed "cmd"

Preferences class allows access to HK_CURRENT_USER and HK_LOCAL_MACHINE but does anyone know how you can access the other registry roots under windows. i.e. HKEY_CLASS_ROOT for example, i need to alter default file associates.
Many thanks

[JosAH]

Preferences class allows access to HK_CURRENT_USER and HK_LOCAL_MACHINE but does anyone know how you can access the other registry roots under windows. i.e. HKEY_CLASS_ROOT for example, i need to alter default file associates.
Many thanks

You can't; the Preferences classes define their own two roots as you might have
noticed. There is no way to get 'above' those. Those Preferences are not a general
MS Windows registry manipulation package.

kind regards,

Jos