java网络编程之TCP实例

package Socket;

import java.net.DatagramPacket;
import java.net.InetAddress;

public class Dgram {

    public static DatagramPacket toDatagram(String s, InetAddress destIA,
            int destPort) {
        byte[] buf = new byte[s.length() + 1];
        s.getBytes(0, s.length(), buf, 0);
        return new DatagramPacket(buf, buf.length, destIA, destPort);
    }

    public static String toString(DatagramPacket p) {
        return new String(p.getData(), 0, p.getLength());
    }
}

package Socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

class ServeOneJabber extends Thread {
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    public ServeOneJabber(Socket s) throws IOException {
        socket = s;
        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                socket.getOutputStream())), true);
        start();
    }

    public void run() {
        try {
            while (true) {
                String str = in.readLine();
                if (str.equals("END"))
                    break;
                System.out.println("Echoing:" + str);
                out.println("From Server:"+str);
            }
            System.out.println("closing...");
        } catch (IOException e) {
        } finally {
            try {
                socket.close();
            } catch (Exception e2) {
            }
        }
    }
}

public class MultiJabberServer {
    static final int PORT = 8080;

    public static void main(String[] args) throws IOException {
        ServerSocket s = new ServerSocket(PORT);
        System.out.println("Server Started");
        try {
            while (true) {
                Socket socket = s.accept();
                try {
                    new ServeOneJabber(socket);
                } catch (IOException e) {
                    socket.close();
                }
            }
        } finally {
            s.close();
        }
    }

}

package Socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

class JabberClientThread extends Thread {
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;
    private static int counter = 0;
    private int id = counter++;
    private static int threadcount = 0;

    public static int threadCount() {
        return threadcount;
    }

    public JabberClientThread(InetAddress addr) {
        System.out.println("Making client " + id);
        threadcount++;
        try {
            socket = new Socket(addr, MultiJabberServer.PORT);
        } catch (IOException e) {
        }
        try {
            in = new BufferedReader(new InputStreamReader(
                    socket.getInputStream()));
            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                    socket.getOutputStream())), true);
            start();
        } catch (IOException e) {
            try {
                socket.close();
            } catch (IOException e2) {
            }
        }
    }

    public void run() {
        try {
            for (int i = 0; i < 25; i++) {
                out.println("Client " + id + ":" + i);
                String str = in.readLine();
                System.out.println(str);
            }
            out.println("END");
        } catch (IOException e) {
        } finally {
            try {
                socket.close();
            } catch (IOException e2) {
                threadcount--;
            }
        }
    }
}

public class MultiJabberClient {
    static final int MAX_THREADS = 40;

    public static void main(String[] args) throws IOException,
            InterruptedException {
        InetAddress addr = InetAddress.getByName(null);
        while (true) {
            if (JabberClientThread.threadCount() < MAX_THREADS)
                new JabberClientThread(addr);
            Thread.currentThread().sleep(100);
        }
    }
}