服务端：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;public class ChatFrameServer{private PrintWriter pw;private JFrame frame;private JPanel pane_buttom;private JSplitPane pane_center;//显示内容的文本框，输入内容的文本框，发送内容按钮private JScrollPane pane_showWindow;private JScrollPane pane_inputWindow;private JTextArea area_showWindow;private JTextArea area_inputWindow;private JButton btn_send;private Dimension dimension;//用于设置area_showWindow可拖拉的大小//初始化public ChatFrameServer() {frame = new JFrame();pane_buttom = new JPanel();pane_showWindow = new JScrollPane();pane_inputWindow = new JScrollPane();area_showWindow = new JTextArea();area_inputWindow = new JTextArea();pane_center = new JSplitPane(JSplitPane.VERTICAL_SPLIT, false, pane_showWindow, pane_inputWindow);btn_send = new JButton("发送");dimension = new Dimension(50, 300);}//调用方法显示窗口public void showFrame(){initFrame();initChatTextArea();initButton();btn_send();socket();}//主窗体public void initFrame(){frame.setTitle("服务端");int width = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();int height = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();frame.setBounds(width / 2, height / 2, 400, 450);frame.setVisible(true);}//内容显示文本框和输入内容文本框private void initChatTextArea(){//取得视图焦点pane_showWindow.getViewport().add(area_showWindow);pane_inputWindow.getViewport().add(area_inputWindow);//将显示文本域设置为不可编辑area_showWindow.setEditable(false);//设置显示文本域可拖拉的大小 pane_showWindow.setMinimumSize(dimension);frame.add(pane_center, BorderLayout.CENTER);}//发送文件，发送内容按钮public void initButton(){pane_buttom.add(btn_send);frame.add(pane_buttom, BorderLayout.SOUTH);}private void btn_send(){btn_send.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String info = area_inputWindow.getText();area_showWindow.append("服务端："+info+"\r\n");pw.println(info);area_inputWindow.setText("");}});}private void socket(){ServerSocket ss;try {ss = new ServerSocket(9988);//等待连接 客户端Socket s=ss.accept();InputStreamReader isr=new InputStreamReader(s.getInputStream());BufferedReader br=new BufferedReader(isr);//PrintWriter必须和socket有密切的关系pw=new PrintWriter(s.getOutputStream(),true);//读取从客户端法发来的信息while(true) {//读取从客户端发来的信息String info=br.readLine();//在文本栏里显示area_showWindow.append("客户端:"+info+"\r\n");}} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {ChatFrameServer chat = new ChatFrameServer();chat.showFrame();}
}

客户端：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;public class ChatFrame{private PrintWriter pw;private JFrame frame;private JPanel pane_buttom;private JSplitPane pane_center;//显示内容的文本框，输入内容的文本框,发送内容按钮private JScrollPane pane_showWindow;private JScrollPane pane_inputWindow;private JTextArea area_showWindow;private JTextArea area_inputWindow;private JButton btn_send;private Dimension dimension;//用于设置area_showWindow可拖拉的大小//初始化public ChatFrame() {frame = new JFrame();pane_buttom = new JPanel();pane_showWindow = new JScrollPane();pane_inputWindow = new JScrollPane();area_showWindow = new JTextArea();area_inputWindow = new JTextArea();pane_center = new JSplitPane(JSplitPane.VERTICAL_SPLIT, false, pane_showWindow, pane_inputWindow);btn_send = new JButton("发送");dimension = new Dimension(50, 300);}//调用方法显示窗口public void showFrame(){initFrame();initChatTextArea();initButton();btn_send();socket();}//主窗体public void initFrame(){frame.setTitle("客户端");int width = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();int height = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();frame.setBounds(width / 2, height / 2, 400, 450);frame.setVisible(true);}//内容显示文本框和输入内容文本框private void initChatTextArea(){//取得视图焦点pane_showWindow.getViewport().add(area_showWindow);pane_inputWindow.getViewport().add(area_inputWindow);//将显示文本域设置为不可编辑area_showWindow.setEditable(false);//设置显示文本域可拖拉的大小 pane_showWindow.setMinimumSize(dimension);frame.add(pane_center, BorderLayout.CENTER);}//发送文件，发送内容按钮public void initButton(){pane_buttom.add(btn_send);frame.add(pane_buttom, BorderLayout.SOUTH);}private void btn_send(){btn_send.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String info = area_inputWindow.getText();area_showWindow.append("客户端： "+info+"\r\n");pw.println(info);area_inputWindow.setText("");}});}private void socket(){try {Socket s = new Socket("127.0.0.1",9988);InputStreamReader isr=new InputStreamReader(s.getInputStream());BufferedReader br=new BufferedReader(isr);pw=new PrintWriter(s.getOutputStream(),true);while(true){//不停地读取从服务器端发来的信息String info=br.readLine();area_showWindow.append("服务端： "+info+"\r\n");}} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public static void main(String[] args) {ChatFrame chat = new ChatFrame();chat.showFrame();}
}