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accept password in dos using java

3 replies on 1 page. Most recent reply: Jun 11, 2002 5:11 AM by vinodh

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Janu

Posts: 8
Nickname: janu
Registered: May, 2002

accept password in dos using java

Posted: May 19, 2002 12:31 AM

Hi..
I want to accept the Password from the user in DOS using java.the password must be taken in astriks.was there any way?

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: accept password in dos using java

Posted: May 19, 2002 12:58 AM

This kind of thing would normally be done with functions in conio.h (like getch()), whereas Java only has buffered I/O on the console, as far as I know. It would be pretty easy to write a little native method that does the trick, by calling getch() to get characters and putting (putch()) a '*' for each character (besides backspace, enter, etc.). The same source might compile for both UNIX and DOS, as well.

Janu

Posts: 8
Nickname: janu
Registered: May, 2002

Please get me the code

Posted: May 19, 2002 1:16 AM

i am not good with native methods,cone you give the example...

vinodh

Posts: 2
Nickname: vinodh
Registered: Jun, 2002

Re: Please get me the code

Posted: Jun 11, 2002 5:11 AM

Hope this method will help u to read password.....

public String readPassword () {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
Clear clear= new Clear( System.out );
clear.start ();
String password = "";
try {
password = in.readLine();
} catch ( IOException ioe ) {
}
clear.interrupt ();
try {
Thread.sleep ( 100 );
} catch (InterruptedException inte ) {
}
return password;
}
/**thread to
* replace each character with asterisk
*/
class Clear extends Thread {
PrintStream out;
boolean finish=false;
public Clear (PrintStream out) {
this.out = out;
}
public void run () {
while ( !finish ) {
out.print ( "\010*" );
try {
sleep ( 10 );
} catch ( InterruptedException inte ) {
finish = true;
}
}
}
}

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