socket编程——局域网聊天

        这是前段时间写的一个局域网多对多聊天系统，使用socket编程和TCP/IP协议进行数据传输。总体就两个部分，一个是客户端，还有一个是服务器端。其实这个系统编写起来还是很容易的。我这个小程序：

1、有一个登陆界面；

2、登陆之后进入聊天界面后会有一个服务器的欢迎语句。

在这里给出程序的源代码。

package org.zsl.server;//服务器部分import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.EOFException;import java.io.IOException;import java.net.BindException;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;import java.util.Date;import java.util.List;/* * ChatServer类服务器 *  main() 启动程序入口 *  start1()启动服务器，无线循环等待客户端 *  * ServerThread类实现了Runnable接口  *ServerThread(Socket s)构造方法 *send()发送数据给客户端 *run()覆写方法，接收数据并发送给所有的客户端 * */public class ChatServer {private static boolean isRun = false;//标识符private ServerSocket serverSocket = null;//服务器private Socket client = null;private String name = null;List<ServerThread> st = new ArrayList<ServerThread>();//st集合用来装产生的服务器线程public static void main(String[] args) {//启动方法System.out.println("服务器启动！");new ChatServer().start1();}private void start1() {try {serverSocket = new ServerSocket(8888);//实例化服务器，开启端口isRun = true;//改变标识符} catch (BindException e) {System.out.println("端口使用中");System.exit(0);} catch (IOException e) {e.printStackTrace();}try {while (isRun) {//无限循环client = serverSocket.accept();//等待客户端连接,阻塞ServerThread serverThread = new ServerThread(client);//一个客户端连接产生了一个服务器的线程st.add(serverThread);//将线程加入结合name = serverThread.dis.readUTF();serverThread.setName(name);new Thread(serverThread).start();//启动线程for (int i = 0; i < st.size(); i++) {//遍历所有的线程ServerThread temp = st.get(i);temp.send("<服务器> 欢迎 "+this.name+" 进入聊天室！\n");//向所有的线程发送信息}// dis.close();}} catch (IOException e) {e.printStackTrace();} finally {try {serverSocket.close();//关闭服务器} catch (IOException e) {e.printStackTrace();}}}class ServerThread implements Runnable {private Socket client;//定义客户端private DataInputStream dis = null;//定义输入流private DataOutputStream dos = null;//定义输出流private boolean bConnected = false;//定义标志位private boolean flag = true;private String name = null;//定义用户姓名public String getName() {return name;}public void setName(String name) {this.name = name;}public ServerThread(Socket s) {this.client = s;try {dis = new DataInputStream(s.getInputStream());//实例化接收客户端的信息的对象dos = new DataOutputStream(s.getOutputStream());//实例化向客户端发送信息对象bConnected = true;} catch (IOException e) {e.printStackTrace();}}public void send(String str) {//发送信息的方法try {dos.writeUTF(str);} catch (IOException e) {st.remove(this);}}@Overridepublic void run() {try {while (bConnected) {String str = dis.readUTF();for (int i = 0; i < st.size(); i++) {//遍历所有的线程ServerThread temp = st.get(i);temp.send("<"+this.name+"  "+new Date()+">\n"+"  "+str);//向所有的线程发送信息}}} catch (EOFException e) {System.out.println("client closed");} catch (IOException e) {e.printStackTrace();} finally {try {if (client != null) {client.close();client = null;}if (dis != null)dis.close();if (dos != null)dos.close();} catch (IOException e1) {e1.printStackTrace();}}}}}

<pre code_snippet_id="137770" snippet_file_name="blog_20140101_2_5626823" name="code" class="java">package org.zsl.client;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;//登陆界面public class Register {private JFrame frame = new JFrame("聊天系统登陆界面");private JLabel lab = new JLabel("请输入姓名：",JLabel.CENTER);private JTextField name = new JTextField();private JButton submit=new JButton("登陆");private JButton reset=new JButton("重置");private String c_name = null;public String getName(){//取得用户注册姓名return c_name;}public Register(){submit.addActionListener(new ActionListener(){//采用匿名内部类,注册submit的事件监听public void actionPerformed(ActionEvent arg0){if(arg0.getSource()==submit){//判断触发源是否是提交按钮c_name=name.getText();new ChatClient(c_name);//将c_name传递到了ChatClient中frame.dispose();//关闭本窗口}}});reset.addActionListener(new ActionListener(){//注册reset的时间监听public void actionPerformed(ActionEvent arg1){if(arg1.getSource()==reset){//这个按钮没有反应name.setText("");}}});frame.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent arg0){System.exit(1);}});frame.setLayout(null);lab.setBounds(25, 50, 100, 50);name.setBounds(135, 60, 150, 30);submit.setBounds(75, 120, 80, 30);reset.setBounds(190, 120, 80, 30);frame.add(lab);frame.add(name);frame.add(submit);frame.add(reset);int width = 350;int high = 240;int w = (Toolkit.getDefaultToolkit().getScreenSize().width - width) / 2;int h = (Toolkit.getDefaultToolkit().getScreenSize().height - high) / 2;frame.setSize(width, high);frame.setLocation(w, h);frame.setVisible(true);}public static void main(String[] args) {new Register();}}

</pre><pre code_snippet_id="137770" snippet_file_name="blog_20140101_4_5943251" name="code" class="java"><pre code_snippet_id="137770" snippet_file_name="blog_20140101_4_5943251" name="code" class="java">package org.zsl.client;//客户端部分import java.awt.Frame;import java.awt.TextArea;import java.awt.TextField;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.EOFException;import java.io.IOException;import java.net.Socket;import java.net.SocketException;import java.net.UnknownHostException;import javax.swing.JButton;import javax.swing.JPanel;public class ChatClient extends Frame {Socket socket = null;TextField inputChat = new TextField(); // 定义文本框用来输入数据TextArea showChat = new TextArea(); // 展示数据的地方JButton submit = new JButton("发送");JPanel pan = new JPanel();DataInputStream dis = null; // 接收流DataOutputStream dos = null; // 输出流private String c_name = null;private static boolean isRun = false;private boolean flag = true; // 让c_name的传递只有一次public ChatClient() {}public static void main(String[] args) {new ChatClient().launchFrame();}public ChatClient(String name) {this.c_name = name;this.launchFrame();}public void launchFrame() { // Swing 界面this.setTitle("局域网聊天系统");int width = 510;int high = 360;this.setLayout(null);this.setSize(width, high);showChat.setBounds(5, 5, 490, 295);pan.setBounds(5, 305, 490, 45);pan.setLayout(null);inputChat.setBounds(5, 5, 400, 40);submit.setBounds(405, 5, 95, 40);// 居中地位int w = (Toolkit.getDefaultToolkit().getScreenSize().width - width) / 2;int h = (Toolkit.getDefaultToolkit().getScreenSize().height - high) / 2;pan.add(inputChat);pan.add(submit);this.add(showChat);this.add(pan);this.setLocation(w, h);this.setVisible(true);addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {disconnect();System.exit(0);}});inputChat.addActionListener(new TextFieldListener()); // 输入窗口中添加监听submit.addActionListener(new TextFieldListener()); // 输入窗口中添加监听connectToServer(); // 连接服务器Thread clientThread = new Thread(new ClientThread());clientThread.start(); // 启动客户端线程}private void connectToServer() {try {socket = new Socket("125.221.225.105", 8888);dis = new DataInputStream(socket.getInputStream());dos = new DataOutputStream(socket.getOutputStream());isRun = true;} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}public void disconnect() { // 如果没连接上服务器则关闭输入输出流和客户端套接字// 关闭各种流之前必须先关闭接受线程try {if (dos != null) {dos.close();}if (dis != null) {dis.close();}if (socket != null) {socket.close();}} catch (IOException e) {e.printStackTrace();}}private class ClientThread implements Runnable {@Overridepublic void run() {try {if (flag) { // 启动客户端只传递一次姓名dos.writeUTF(c_name);flag = false;}while (isRun) { // 无线循环String str = dis.readUTF(); // 取得服务器端发送的消息// System.out.println(str);// showChat中的部分由以前的 和 现在的组成showChat.setText(showChat.getText() + str + '\n'); // 在showChat中显示}} catch (SocketException e) {System.out.println("bye");} catch (EOFException e) {} catch (IOException e) {e.printStackTrace();}}}private class TextFieldListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent e) {String s = inputChat.getText().trim();if (e.getSource() == submit) {if(!("".equals(s))){// showChat.setText(s);inputChat.setText("");try {dos.writeUTF(s);dos.flush();// dos.close();} catch (IOException e1) {e1.printStackTrace();}}} else {// showChat.setText(s);inputChat.setText("");try {dos.writeUTF(s);dos.flush();// dos.close();} catch (IOException e1) {e1.printStackTrace();}}}}}