How to input to a Process using its streams?

Question

Hi here is my program to call the mysqldump using the Runtime.exec(), but i don't know how to pass the password.
if I run this commad in the dos console it will ask for password. but i don't know how to give the password thru the streams. please help me
public static void dump(Connection _con ,String _host,String _userName,String _password,String _database,String _fileName)throws SQLException,IOException,InterruptedException
    String dumpCommand="D:\\mysql\\bin\\mysqldump -h "+_host+" -u "+_userName+" -p "+_database+" > "+_fileName;
       System.out.println(" command "+dumpCommand);
   Runtime rt=Runtime.getRuntime();
     Process p=rt.exec(dumpCommand);
  OutputStream os=p.getOutputStream();
     byte[] buf=_password.getBytes();
// here i dont know what is happening
    os.write(buf);
    System.out.println(" after os.write ");
    System.out.println(" exit value="+p.waitFor());
  }

Answer 1

http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html