java - How to get and change System password using servlet? -

i have system(windows) username , system(windows) current password , change current password new password using servlet code.

getting current windows password not possible. if jvm running under user account admin rights, can reset users password using processbuilder class , windows net user command.

processbuilder pb = new processbuilder("net", "user", "someusername", "somepassword"); process pro = pb.start(); 

to check result of command, read it's error stream , input stream of process object returned exec method.

bufferedreader bre = null; bufferedreader bri = null; try{     bre = new bufferedreader(new inputstreamreader(pro.geterrorstream()));     bri = new bufferedreader(new inputstreamreader(pro.getinputstream()));     pro.waitfor(); //wait command finish     string line;     while((line = bre.readline()) != null)         system.out.println(line);     while((line = bri.readline()) != null)         system.out.println(line); } {     if(bre != null)         bre.close();     if(bri != null)         bri.close(); }