java 聊天程序

package cn.apr.chart;

import java.net.*;
import java.io.*;
import java.util.*;

public class ChatServer {
    /**
     * @param args
     *            m_threads是一个Vector静态变量，维护所有Server方的ServerThread对象，
     *            通过该变量能向所有加入聊天室的聊天者ChatApplet广播信息，撤销退出的聊天者。
     *            聊天服务者ChatServer的主方法。该方法监听聊天者Chat Applet的请求， 并为新连接的聊天者创建一个服务线程。
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ServerSocket socket = null;
        Vector m_threads = new Vector();
        System.out.println("listen...");
        try {
            // 设置ServerSocket监听端口号为5555，这个数字必须和程序聊天者ChatApplet中的port参数一致
            socket = new ServerSocket(5555);
        } catch (Exception e) {
            System.out.println("new ServerSocket() failed!");
            return;
        }
        try {
            int nid = 0;
            while (true) {
                // 监听是否有新聊天者Chat Applet连接到聊天Server，
                // 线程运行到该语句会封锁，直到有新的连接产生
                Socket s = socket.accept();
                System.out.println("accepted");
                // 创建一个新的ServerThread
                ServerThread st = new ServerThread(s, m_threads);
                // 为该线程设置一个ID号
                st.setID(nid++);
                // 将线程加入到m_threads Vector中
                m_threads.addElement(st);
                // 启动服务线程
                new Thread(st).start();
                // 通知所有ChatApplet有一个新的网友加入
                for (int i = 0; i < m_threads.size(); i++) {
                    ServerThread st1 = (ServerThread) m_threads.elementAt(i);
                    st1.write("<#>welcome" + st.getID() + "to enter chatroom!");
                }
                System.out.println("Listen again...");
            }
        } catch (Exception e) {
            System.out.println("Server is down...");
        }
    }
}

// 监听线程，监听对应的Chat Applet是否有信息传来
class ServerThread implements Runnable {
    Vector m_threads;
    Socket m_socket = null;
    DataInputStream m_in = null;
    DataOutputStream m_out = null;
    int m_nid;

    // 初始化线程
    public ServerThread(Socket s, Vector threads) {
        m_socket = s;
        m_threads = threads;
        try {
            // 构造数据输入、输出流对象
            m_in = new DataInputStream(m_socket.getInputStream());
            m_out = new DataOutputStream(m_socket.getOutputStream());
        } catch (Exception e) {
        }
    }

    public void run() // 线程的执行体
    {
        System.out.println("thread is running");
        try {
            while (true) {
                // 监听对应的ChatApplet是否传来消息
                // 线程封锁在m_in.readUTF()中，直到有信息传来才返回
                String s = m_in.readUTF();
                if (s == null)
                    break;
                // 如果Chat Applet传来的信息为“leave”,则通知所有其他的ChatApplet自己推出了
                if (s.trim().equals("leave"))
                    for (int i = 0; i < m_threads.size(); i++) {
                        ServerThread st = (ServerThread) m_threads.elementAt(i);
                        st.write("***" + getID() + "leave..." + "***");
                    }
                else
                    // 向所有ChatApplet广播该消息
                    for (int i = 0; i < m_threads.size(); i++) {
                        ServerThread st = (ServerThread) m_threads.elementAt(i);
                        st.write("<" + getID() + ">" + s);
                    }
            } // while(true)
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 从m_threads Vector中删除该线程，表示该线程已经离开聊天室
        m_threads.removeElement(this);
        System.out.println("remove element!");
        try {
            m_socket.close();
        } catch (Exception e) {
        }
    }

    // 将msg送回对应的Applet
    public void write(String msg) {
        synchronized (msg) {
            try {
                m_out.writeUTF(msg);
            } catch (IOException e) {
            }
        }
    }

    public int getID() // 获得该线程的ID
    {
        return m_nid;
    }

    public void setID(int nid) // 设置线程的ID
    {
        m_nid = nid;
    }
}

//////////////

package cn.apr.chart;

import java.awt.*;
import java.applet.*;
import java.io.*;
import java.net.*;

//继承Applet，实现Runnable
public class ChatApplet1 extends Applet implements Runnable {
    TextArea m_textarea; // 接受消息显示窗口
    TextField m_textfield; // 发送消息输入窗口
    DataInputStream m_in; // 消息输入流
    DataOutputStream m_out; // 消息输出流

    /**
     * @param args
     *  ChatApplet的初始化方法
     */
    public void init() {
        // 创建窗口
        setLayout(null);
        setSize(426, 266);
        m_textarea = new TextArea(10, 10);
        m_textfield = new TextField();
        m_in = null;
        m_out = null;
        // 初始化Appleton，并连接到聊天服务者
        try {
            // 获取applet的URL，即通过服务器地址
            URL url = getCodeBase();
            // 获取服务器IP地址
            InetAddress inetaddr = InetAddress.getByName(url.getHost());
            Socket m_socket;
            // 屏幕显示服务器IP地址、通信协议
            System.out.println("Server:" + inetaddr + "" + url.getHost() + ""
                    + url.getProtocol());
            // 创建与服务器IP地址连接的套接口，5555是聊天服务器套接口端口
            m_socket = new Socket(inetaddr, 5555);
            // 在套接口上建立输入流
            m_in = new DataInputStream(m_socket.getInputStream());
            // 在套接口上建立输出流
            m_out = new DataOutputStream(m_socket.getOutputStream());
        } catch (Exception e) {
            System.out.println("Error:" + e);
        }
        setLayout(new BorderLayout());
        add("Center", m_textarea);
        add("South", m_textfield);
        m_textarea.setEditable(false);
        // 启动监听线程
        new Thread(this).start();
    }

    // 当聊天者在消息输入窗口键入回车后，读取字符串，发送给聊天服务者。

    public boolean handleEvent(Event event) {
        String b = m_textfield.getText();
        if ((event.target == m_textfield) && (event.id == Event.ACTION_EVENT)) {
            m_textfield.setText("");
            // 将聊天者输入的消息发送给ChatServer
            try {
                m_out.writeUTF(b); // 向聊天服务者发送一个UFT格式字符串
            } catch (IOException e) {
            }
            return true;
        } else
            return super.handleEvent(event);
    }

    // 聊天者监听对应的服务线程，在读取对应服务线程传来的消息，并显示在通信显示窗口中

    public void run() {
        try {
            while (true) {
                // 聊天者监听对应服务线程发来的消息，它将封锁在该语句中，直到消息到来
                String s = m_in.readUTF(); // 读一个UTF格式字符串
                if (s != null)
                    // 将消息显示在信息显示窗口中
                    m_textarea.append(s + " ");
            }
        } catch (Exception e) {
            m_textarea.append("Network problem or Server down. ");
            m_textfield.setVisible(false);
        }
    }

    public void stop() {
        try {
            m_out.writeUTF("leave");
        } catch (IOException e) {
        }
    }

    public static void main(String[] args) {
        // TODO 自动生成方法存根
    }
}

package cn.apr.socket;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class MyClient  {

    protected Shell shell;
    private Text textChatInfo;
    private Text textMsg;

    /**
     * Launch the application.
     *
     * @param args
     */
    public static void main(String[] args) {
        try {
            MyClient window = new MyClient();
            window.open();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Open the window.
     */
    public void open() {
        Display display = Display.getDefault();
        createContents();
        shell.open();
        shell.layout();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }

    /**
     * Create contents of the window.
     */
    protected void createContents() {
        shell = new Shell();
        shell.setSize(450, 300);
        shell.setText("SWT Application");
        GridLayout layout = new GridLayout(3, false);
        shell.setLayout(layout);

        /* line begin */
        Label lblServerIp = new Label(shell, SWT.NONE);
        lblServerIp.setAlignment(SWT.RIGHT);
        lblServerIp.setText("IP:");

        Text textServerIP = new Text(shell, SWT.BORDER);
        GridData gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.grabExcessHorizontalSpace = true;
        gd.horizontalSpan  = 2;
        gd.widthHint = 200;
        textServerIP.setLayoutData(gd);
        textServerIP.setText("127.0.0.1");

        /* line begin */
        Label lblPort = new Label(shell, SWT.NONE);
        lblPort.setAlignment(SWT.RIGHT);
        lblPort.setText("Port:");

        Text textServerPort = new Text(shell, SWT.BORDER);
        gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.grabExcessHorizontalSpace = true;
        gd.horizontalSpan  = 2;
        textServerPort.setLayoutData(gd);
        textServerPort.setText("6666");

        /* line begin */
        new Label(shell, SWT.NONE);
        Text textChatInfo = new Text(shell, SWT.BORDER|SWT.MULTI);
        gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.verticalAlignment = GridData.FILL;
        gd.grabExcessHorizontalSpace = true;
        gd.grabExcessVerticalSpace = true;
        gd.horizontalSpan = 2;
        gd.heightHint = 150;
        textChatInfo.setLayoutData(gd);

        /* line begin */
        new Label(shell, SWT.NONE);
        Text textMsg = new Text(shell, SWT.BORDER );
        gd = new GridData();
        gd.horizontalAlignment = GridData.FILL;
        gd.horizontalSpan = 1;
        gd.grabExcessHorizontalSpace = true;
        textMsg.setLayoutData(gd);

        Button btnSend = new Button(shell, SWT.NONE);
        btnSend.setText("Send");
        gd = new GridData();
        gd.grabExcessHorizontalSpace = true;
        btnSend.setLayoutData(gd);
    }
}