Java网络编程——TCP实例

1、客户端

　　1.1：创建服务端点

　　1.2：获取已有数据

　　1.3：通过socket输出流将数据发送给服务端

　　1.4：读取服务端反馈信息

　　1.5：关闭socket

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class TCPClient
{

    static Socket socket;
    public static void main(String[] args)
    {
        BufferedReader br = null;
        BufferedInputStream bi = null;
        BufferedOutputStream bo = null;
        try
        {
            socket = new Socket("10.9.194.71", 8638);
            bi = new BufferedInputStream(socket.getInputStream());
            bo = new BufferedOutputStream(socket.getOutputStream());

            br = new BufferedReader(new InputStreamReader(System.in));
            String line = null;
            while ((line = br.readLine()) != null)
            {
                bo.write(line.getBytes());
                bo.flush();
                if (line.equals("quit"))
                {
                    bi.close();
                    bo.close();
                    br.close();
                    socket.close();
                    break;
                }
                byte[] buf = new byte[1024];
                int len = bi.read(buf);

                System.out.println(new String(buf, 0, len));
            }

        } catch (UnknownHostException e)
        {
            e.printStackTrace();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if (bi != null)
                    bi.close();
                if (br != null)
                    br.close();
                if (bo != null)
                    bo.close();
                if (socket != null)
                    socket.close();
            } catch (IOException e)
            {

                e.printStackTrace();
            }
        }
    }

}

2、服务器

import java.io.IOException;
import java.net.ServerSocket;

public class TCPServer
{
    static int acount = 0;

    public static void main(String[] args)
    {

        try
        {
            ServerSocket serverSocket = new ServerSocket(8638);
            while (true)
                new Thread(new MultiClient(serverSocket.accept(), ++acount))
                        .start();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Date;

public class MultiClient implements Runnable
{

    private Socket client;
    private int acount;
    private BufferedInputStream bi = null;
    private BufferedOutputStream bo = null;

    public MultiClient(Socket client, int acount)
    {

        this.client = client;
        this.acount = acount;
    }

    @Override
    public void run()
    {
        try
        {
            Date start = new Date();

            String recordStart = start + " :: "
                    + client.getInetAddress().getHostAddress() + " :: 第"
                    + acount + "用户成功连接";
            System.out.println(recordStart);
            WriteLog.writeLog(recordStart);
            bi = new BufferedInputStream(client.getInputStream());
            BufferedOutputStream bo = new BufferedOutputStream(
                    client.getOutputStream());

            while (true)
            {
                byte[] buf = new byte[1024];
                int len = bi.read(buf);
                String info = new String(buf, 0, len);
                System.out.println(info);
                bo.write(("Has Receive:" + info).getBytes());
                bo.flush();
                if (info.equals("quit"))
                    break;
            }
            Date end = new Date();

            String recordEnd = end + " :: "
                    + client.getInetAddress().getHostAddress() + " :: 第"
                    + acount + "用户退出连接";
            System.out.println(recordEnd);
            WriteLog.writeLog(recordEnd);

        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            try
            {
                if (bi != null)
                    bi.close();
                if (bo != null)
                    bo.close();
                if (client != null)
                    client.close();
            } catch (IOException e)
            {

                e.printStackTrace();
            }
        }
    }
}

import java.io.File;
import java.io.FileWriter;

public class WriteLog
{
    public static void writeLog(String str)
    {
        File logFile = new File("server-log.txt");
        try
        {
            FileWriter out = new FileWriter(logFile, true);
            out.append(str + '\n');
            out.close();
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}