Hi, Also check the JDJ archives. The "Ping" / "Echo Port" subject has been discussed here in detail months ago.
sincerely, U. Penski [EMAIL PROTECTED] ----- Original Message ----- From: "Yan, Hong [IT]" <[EMAIL PROTECTED]> To: "JDJList" <[EMAIL PROTECTED]> Sent: Wednesday, September 18, 2002 8:31 PM Subject: [jdjlist] RE: Ping utilty - through Java > If I am correct, the ping is from a specific port. The PseudoPing that you > provided probably goes thru http port. > > Jeff > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, September 18, 2002 2:14 PM > To: JDJList > Subject: [jdjlist] RE: Ping utilty - through Java > > > > > Hi, > > I got this example from Real Gagnon's website at http://www.rgagnon.com : > > Ping a server > > It's not possible to really "ping" a machine to check if it's alive or not > (it's a long story, but to keep it short I will just say that the Socket > class is not low-level enough for that operation). But we can emulate a > ping by talking the "echo port". On a server, the echo port is always port > 7. We write a string to that port and the server will echo the string. > > import java.io.*; > import java.net.*; > > public class PseudoPing { > public static void main(String args[]) { > try { > Socket t = new Socket(args[0], 7); > DataInputStream dis = new DataInputStream(t.getInputStream()); > PrintStream ps = new PrintStream(t.getOutputStream()); > ps.println("Hello"); > String str = is.readLine(); > if (str.equals("Hello")) > System.out.println("Alive!") ; > else > System.out.println("Dead or echo port not responding"); > t.close(); > } > catch (IOException e) { > e.printStackTrace();} > } > } > > HTH, > Greg. > > > > > > > Shawn Quinn <[EMAIL PROTECTED]> on 2002/09/18 01:42:33 PM > > Please respond to "JDJList" <[EMAIL PROTECTED]> > > To: "JDJList" <[EMAIL PROTECTED]> > cc: > > Subject: [jdjlist] RE: Ping utilty - through Java > > > I believe java.net.InetAddress.getByName(String host) should do what you > need. > > Hope this helps, > > -Shawn > > -----Original Message----- > From: Nahid, Nazneen (CORP, Consultant) > [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, September 18, 2002 1:35 PM > To: JDJList > Subject: [jdjlist] Ping utilty - through Java > > > Hi , > > Problem :- A given set of server HostName. Have to write a program inb Java > to get there IPAddress. > ( the feature that is obtained my ping utility). > > Any help soon would be appreciated. > > > Thanks & Regards, > > Nazneen Nahid > GECIS -Tata Consultancy Services > * Phone 518-612-6826 DialComm *8-222-6826 > * E-Mail mailto:[EMAIL PROTECTED] > Visit TCS at: http://www.tcs.com > > > > > To change your JDJList options, please visit: > http://www.sys-con.com/java/list.cfm > > To change your JDJList options, please visit: > http://www.sys-con.com/java/list.cfm > > > > > > > > To change your JDJList options, please visit: > http://www.sys-con.com/java/list.cfm > > To change your JDJList options, please visit: http://www.sys-con.com/java/list.cfm To change your JDJList options, please visit: http://www.sys-con.com/java/list.cfm
