Intermediate Java(41) - Waiting for a Connection

import java.io.*;

import java.net.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Server extends JFrame {

private JTextField userText;

private JTextArea chatwindow;

private ObjectOutputStream output;

private ObjectInputStream input;

private ServerSocket server;

private Socket connection;

//constructor

public Server(){

super("My Awesome Instant Messenger");

userText = new JTextField();

userText.setEditable(false);

userText.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

sendMessage(event.getActionCommand());

userText.setText("");

}

}

);

add(userText,BorderLayout.NORTH);

chatwindow = new JTextArea();

add(new JScrollPane(chatwindow));

setSize(400,200);

setVisible(true);

}

//設置和運行server

public void startRunning(){

try{

server = new ServerSocket(6789,10); → 服務器端口(port)和多少人可以等待

while(true){

try{

//連接並有談話

waitForConnection(); → 等待有人連接服務器的函數

setupStreams(); → 設置Stream可以接收和發送的函數

whileChatting(); → 聊天時做什麼的函數

}catch(EOFException eofException){ → 當連接結束例外處理

showMessage("\n Server ended the connection");

}finally{

closeCrap();

}

}

}catch(IOException ioException){

ioException.printStackTrace();

}

}

//等待連接，然後顯示連接信息

private void waitForConnection() throws IOException{

showMessage("Waiting for someone connect....\n");

connection = server.accept(); → 當有人嘗試連接server，接受連接

showMessage("Now connected to "+connection.getInetAddress().getHostName());

}

}

connection.getInetAddress().getHostName()) → 獲得IP地址和主機名