TCP网络编程例子

//客户端
package socket;


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;

public class Client001 {
    public void client() {
        Socket socket = null;
        OutputStream os = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        try {
            //创建IP对象，指明服务器端的IP地址
            InetAddress inet = InetAddress.getByName("127.0.0.1");
            //1.创建Socket对象，指明服务器的ip和端口号
            socket = new Socket(inet, 43333);
            //2.获取一个输出流，用于输出数据
            os = socket.getOutputStream();
            //3.写出数据操作
            os.write("你好,我是客户端".getBytes());
            //关闭数据输出流
            socket.shutdownOutput();
            is = socket.getInputStream();
            baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[20];
            int len1 = 0;
            while ((len1 = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len1);

            }

            System.out.println(baos.toString());

        } catch (IOException e) {
            e.printStackTrace();

        } finally {
            //4.资源关闭
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }
    }


    public static void main(String[] args) {
        Client001 tcp = new Client001();
        tcp.client();

    }
}

//服务端

package socket;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class ServiceDem001 {
    public void server() {
        ServerSocket ss = null;
        Socket socket = null;
        InputStream is = null;
        ByteArrayOutputStream baos = null;
        OutputStream os = null;
        try {
            //1.创建服务器端的ServeSocket,指明自己的端口号
            ss = new ServerSocket(43333);
            //2.调用accept()表示接受来自于客户端的Socket;
            socket = ss.accept();
            //3.创建一个输入流
            is = socket.getInputStream();
            //读取输入流中的数据
            baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[20];
            int len;
            while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            System.out.println(baos.toString());
            System.out.println("收到了来自于：" + socket.getInetAddress().getHostName());
            os = socket.getOutputStream();
            os.write("你好，已收到你的信息".getBytes());


        } catch (IOException e)

        {
            e.printStackTrace();
        } finally

        {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException e) {
                    e.printStackTrace();

                }
            }
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();

                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();

                }
            }
            if (ss != null) {
                try {
                    ss.close();
                } catch (IOException e) {
                    e.printStackTrace();

                }

            }


            }
        }

    }

    public static void main(String[] args) {
        ServiceDem001 service = new ServiceDem001();
        service.server();

    }
}