一、实验目的

​ 1．掌握Java中GUI程序的编写，包括事件监听机制。

​ 2．掌握Java的网络通信编程，ServerSocket，Socket类的使用。

​ 3．掌握Java中多线程的编程，Thread类，Runnable接口的使用。

​ 4．掌握用面向对象的方法分析和解决复杂问题。

二、实验原理

1编写程序完成以下功能：

1.设计一个基于GUI的客户-服务器的通信应用程序，如图1，图2所示。

​ 图1 Socket通信服务器端界面

​ 图2 Socket通信客户端界面

2.图1为Socket通信服务器端界面，点击该界面中的【Start】按钮，启动服务器监听服务（在图1界面中间的多行文本区域显示“Server starting…”字样）。图2为Socket通信客户端界面，点击该界面中的【Connect】按钮与服务器建立链接，并在图2所示界面中间的多行文本区域显示“Connect to server…”字样，当服务器端监听到客户端的连接后，在图1界面中间的多行文本区域追加一行“Client connected…”字样，并与客户端建立Socket连接。

3.当图1所示的服务器端和图2所示的客户机端建立Socket连接后，编程实现服务端、客户端之间的“单向通信”：在客户端的输入界面发送消息，在服务端接收该消息，并将接收到对方的数据追加显示在多行文本框中。

三、使用硬件、软件环境

Windows10，内存8g，硬盘1TB，JDK1.8，eclipse

四、实验过程、步骤及原始记录(算法、原程序、测试结果，分析等)

客户端：

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.*;

import java.net.Socket;

public class Client {

private static Socket socket = null;

public static void main(String[] args){

​ JFrame.setDefaultLookAndFeelDecorated(true);

​ JFrame frame = new JFrame(“客户端”);

​ frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

​ frame.setResizable(false);

​ frame.setBounds(300, 200, 500, 300);

​ frame.setLayout(new BorderLayout(10, 0));

​ JPanel northPanel = new JPanel();

​ JLabel ipLabel = new JLabel("Server Ip: ");

​ JTextField ipField = new JTextField(10);

​ JLabel portLabel = new JLabel("Server Port: ");

​ JTextField portField = new JTextField(6);

​ northPanel.setBorder(BorderFactory.createTitledBorder("客户机设置: "));

​ JButton connectBtn = new JButton(“Connect”);

​ northPanel.add(ipLabel);

​ northPanel.add(ipField);

​ northPanel.add(portLabel);

​ northPanel.add(portField);

​ northPanel.add(connectBtn);

​ JPanel centerPanel = new JPanel();

​ JTextArea area = new JTextArea(10, 35);

​ area.setMargin(new Insets(10, 10, 10, 10));

​ area.setEnabled(false);

​ centerPanel.add(area);

​ JPanel southPanel = new JPanel();

​ JLabel sayLabel = new JLabel("Say: ");

​ JTextField sayField = new JTextField(30);

​ JButton sayBtn = new JButton(“Say”);

​ southPanel.add(sayLabel);

​ southPanel.add(sayField);

​ southPanel.add(sayBtn);

​ frame.add(northPanel, BorderLayout.NORTH);

​ frame.add(centerPanel, BorderLayout.CENTER);

​ frame.add(southPanel, BorderLayout.SOUTH);

​ frame.setVisible(true);

​ connectBtn.addActionListener(new ActionListener() {

​ @Override

​ public void actionPerformed(ActionEvent e) {

​ area.append(“Connect to server…\n”);

​ try {

​ socket = new Socket(ipField.getText(), Integer.parseInt(portField.getText()));

​ }catch (IOException ex){

​ ex.printStackTrace();

​ }

​ new Thread(new Runnable() {

​ @Override

​ public void run() {

​ try {

​ while(true){

​ BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

​ String res = null;

​ while((res = br.readLine()) != null){

​ area.append(res + “\n”);

​ }

​ }

​ } catch (IOException ex) {

​ ex.printStackTrace();

​ }

​ }

​ }).start();

​ }

​ });

​ sayBtn.addActionListener(new ActionListener() {

​ @Override

​ public void actionPerformed(ActionEvent e) {

​ try{

​ PrintWriter pw = new PrintWriter(socket.getOutputStream());

​ pw.println(sayField.getText());

​ pw.flush();

​ area.append(sayField.getText() + “\n”);

​ }catch (IOException ex){

​ ex.printStackTrace();

​ }

​ }

​ });

}

服务器端：

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.*;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

private static ServerSocket serverSocket = null;

private static Socket socket = null;

public static void main(String[] args){

​ JFrame.setDefaultLookAndFeelDecorated(true);

​ JFrame frame = new JFrame(“服务端”);

​ frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

​ frame.setResizable(false);

​ frame.setBounds(300, 200, 500, 300);

​ frame.setLayout(new BorderLayout(10, 0));

​ JPanel northPanel = new JPanel();

​ JLabel portLabel = new JLabel("Port: ");

​ JTextField portField = new JTextField(28);

​ northPanel.setBorder(BorderFactory.createTitledBorder("服务器设置: "));

​ JButton startBtn = new JButton(“Start”);

​ northPanel.add(portLabel);

​ northPanel.add(portField);

​ northPanel.add(startBtn);

​ JPanel centerPanel = new JPanel();

​ JTextArea area = new JTextArea(10, 35);

​ area.setMargin(new Insets(10, 10, 10, 10));

​ area.setEnabled(false);

​ centerPanel.add(area);

​ JPanel southPanel = new JPanel();

​ JLabel sayLabel = new JLabel("Say: ");

​ JTextField sayField = new JTextField(30);

​ JButton sayBtn = new JButton(“Say”);

​ southPanel.add(sayLabel);

​ southPanel.add(sayField);

​ southPanel.add(sayBtn);

​ frame.add(northPanel, BorderLayout.NORTH);

​ frame.add(centerPanel, BorderLayout.CENTER);

​ frame.add(southPanel, BorderLayout.SOUTH);

​ frame.setVisible(true);

​ startBtn.addActionListener(new ActionListener() {

​ @Override

​ public void actionPerformed(ActionEvent e) {

​ area.append(“Server starting…\n”);

​ new Thread(new Runnable() {

​ @Override

​ public void run() {

​ try {

​ serverSocket = new ServerSocket(Integer.parseInt(portField.getText()));

​ socket = serverSocket.accept();

​ area.append(“Client connected…\n”);

​ while(true){

​ BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

​ String res = null;

​ while((res = br.readLine()) != null){

​ area.append(res + “\n”);

​ }

​ }

​ } catch (IOException ex) {

​ ex.printStackTrace();

​ }

​ }

​ }).start();

​ }

​ });

​ sayBtn.addActionListener(new ActionListener() {

​ @Override

​ public void actionPerformed(ActionEvent e) {

​ try{

​ PrintWriter pw = new PrintWriter(socket.getOutputStream());

​ pw.println(sayField.getText());

​ pw.flush();

​ area.append(sayField.getText() + “\n”);

​ }catch (IOException ex){

​ ex.printStackTrace();

​ }

​ }

​ });

}

}

程序截图：

客户端：

服务器端：

五、实验结论、分析、思考题与心得体会

1.实验心得：

通过此次实验掌握了图形界面的设计，掌握了各种组件的设计如何进行布局，学会了如何布置监听器，通过Socket网络通信实现网络通信，掌握了多线程变成方法。

2.双向通信的功能

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() {

​ @Override

​ public 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() {

​ @Override

​ public 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();

​ }

}