Java Socket：小小的C/S

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ChatServer extends JFrame implements ActionListener {
    JFrame frame = null;
    static JTextArea info = null;
    JTextField input = null;
    JButton btn = null;
    JPanel panel = null;
    static ServerSocket serversocket = null;
    static Socket connectToClient = null;
    static DataInputStream inFromClient = null;
    static DataOutputStream outToClient = null;
    ChatServer() {
        super("ChatServer");
        info = new JTextArea();
        input = new JTextField(15);
        btn = new JButton("Send");
        panel = new JPanel();
        btn.addActionListener(this);
        panel.add(input);
        panel.add(btn);
        add(info,BorderLayout.CENTER);
        add(panel,BorderLayout.SOUTH);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        setBounds(300,300,600,300);
    }
    public void actionPerformed(ActionEvent ae) {
        String outStr;
        try {
            outStr = input.getText().toString();
            outToClient.writeUTF(outStr);
            outToClient.flush();
            input.setText("");
            info.append("me: " + outStr + ‘\n‘);
        }catch(IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String args[]) {
        String inStr;
        new ChatServer();
        try {
            InetAddress inet = InetAddress.getLocalHost();
            info.append(inet.getHostAddress() + ‘\n‘);
            info.append(InetAddress.getLocalHost().toString() + ‘\n‘);
            serversocket = new ServerSocket(5500);
            connectToClient = serversocket.accept();
            inFromClient = new DataInputStream(connectToClient.getInputStream());
            outToClient = new DataOutputStream(connectToClient.getOutputStream());
            while(true) {
                inStr = inFromClient.readUTF();
                info.append("opposite: " + inStr + ‘\n‘);
            }
        }catch(IOException e) {
            e.printStackTrace();
        }
    }
}

import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class ChatClient extends JFrame implements ActionListener {
    JButton btn = null;
    JPanel panel = null;
    static JTextArea info = null;
    JTextField input = null;
    static String host = "202.199.116.102";
    static Socket connectToServer = null;
    static DataInputStream inFromServer = null;
    static DataOutputStream outToServer = null;
    ChatClient() {
        JFrame client = new JFrame("ChatClient");
        btn = new JButton("Send");
        panel = new JPanel();
        info = new JTextArea();
        input = new JTextField(15);
        panel.add(input);
        panel.add(btn);
        client.add(info,BorderLayout.CENTER);
        client.add(panel,BorderLayout.SOUTH);
        btn.addActionListener(this);
        client.setDefaultCloseOperation(EXIT_ON_CLOSE);
        client.setVisible(true);
        client.setBounds(300,300,600,300);
    }
    public void actionPerformed(ActionEvent ae) {
        String outStr;
        try {
        outStr = input.getText().toString();
        outToServer.writeUTF(outStr);
        outToServer.flush();
        info.append("me: " + outStr + ‘\n‘);
        }catch(IOException e) {
            e.printStackTrace();
        }
        input.setText("");
    }
    public static void main(String args[]) {
        String inStr;
        new ChatClient();
        try {
            connectToServer = new Socket(host,1080);
            inFromServer = new DataInputStream(connectToServer.getInputStream());
            outToServer = new DataOutputStream(connectToServer.getOutputStream());
            while(true) {
                inStr = inFromServer.readUTF();
                info.append("opposite: " + inStr + ‘\n‘);
            }
        }catch(IOException e) {
            e.printStackTrace();
        }
    }
}