Get the client IP address

Question

Hello everybody, I'm a student new with java, I'm developing a little server application - running standalone, and I'm trying to get the client Ip address, have a look on my code snippet:
InetAddress fromcli;
while(true){
welcomeSKT.accept()
fromcli = welcomeSKT.getInetAddress();
System.out.println("The client Ip Address is: " + fromcli.getHostAddress() + '\n');
The sysout println returns the 0.0.0.0 that is the server address, mapped to more than one interface eg:(loopback and eth0) - But if with the getInetAddress() method I get the server address where is the difference with the getLocalHost()? - By the way, anyone has a suggestion to print out the client remote address.
Thank you in advance....
Jeppojeps
Edited by: jeppojeps on Mar 24, 2008 3:36 AM

Answer 1

Oh, sorry of course welcomeSKT is a ServerSocket, actually the snippet that I put is a part of the code, here below I put the complete program, in order to clarify my question, however I would like to know if it's possible to understand from the server side the client IP address, and if yes how...
Thank you in advance...
* THIS simple TCP server receives some numbers in input by the client and give back the sum - actually the exceptions are managed in a uncomplete way....but this is my first java program...be patient with me...
* @jeppojeps
* @0.1
import java.io.*;
import java.net.*;
public class ServerTCP
// instance variables - replace the example below with your own
public static void main(String[] args) throws Exception
String clientSentence;
String capitalized;
InetAddress fromcli;
String clientIp;
String portIp;
int z=0;
int port=0;
if (args.length == 0 ){
System.out.println("Usage: ServerTCP lport" + '\n');
System.exit(-1);
else
port = Integer.parseInt(args[0]);
if(port <= 1024) {
System.out.println("Remember dude, only root can use a portnumber < 1024" + '\n');
else{
ServerSocket welcomeSKT = new ServerSocket(port);
System.out.println("Server instance started:" + '\n');
while(true){
Socket connectionSocket = welcomeSKT.accept();
BufferedReader InfromClient = new BufferedReader (new
InputStreamReader(connectionSocket.getInputStream()));
DataOutputStream outToClient =
new DataOutputStream(connectionSocket.getOutputStream());
outToClient.writeBytes("Hello give me some numbers and I'll give you the sum" + '\n');
fromcli = welcomeSKT.getInetAddress();
System.out.println("The client Ip Address is: " + fromcli.getHostAddress() + '\n');
clientSentence = InfromClient.readLine();
for(int i = 0 ; i < clientSentence.length() ; i++) {
try {
Character c = new Character(clientSentence.charAt(i));
capitalized = c.toString();
int x = Integer.parseInt(capitalized);
System.out.println("Number digited from the client: " + x + '\n');
z+=x;
catch(NumberFormatException nfe) {
System.out.println("Text: " + clientSentence.charAt(i));
capitalized = Integer.toString(z);
outToClient.writeBytes("The sum of the given number is: " + capitalized + '\n');
welcomeSKT.close();
}