import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class TcpServer extends Thread{

    Socket clientSocket;

    public TcpServer(Socket clientSocket) {

        super();

        this.clientSocket = clientSocket;

    }

    @Override

      public void run() {

        try {

            //获得客户端的ip地址和主机名

            String clientAddress = clientSocket.getInetAddress().getHostAddress();

            String clientHostName = clientSocket.getInetAddress().getHostName();

            System.out.println(clientHostName + "(" + clientAddress + ")" + " 连接成功!");

            System.out.println("Now, 传输图片数据...........");

            long startTime = System.currentTimeMillis();

            //获取客户端的OutputStream

            OutputStream out = clientSocket.getOutputStream();

            //传出图片数据

            FileInputStream in = new FileInputStream(new File("/home/gavinzhou/test.jpg"));

            byte[] data = new byte[4096];

            int length = 0;

            while((length = in.read(data)) != -1){

                out.write(data, 0, length);

                //写出数据

            }

            long endTime = System.currentTimeMillis();

            //提示信息

            System.out.println(clientHostName + "(" + clientAddress + ")" + " 图片传输成功," + "用时:" + ((endTime-startTime)) + "ms");

            //关闭资源

            in.close();

            clientSocket.close();

            System.out.println("连接关闭!");

        }

        catch (IOException e) {

            e.printStackTrace();

        }

    }

    public static void main(String[] args) throws IOException {

        //建立TCP连接服务,绑定端口

        ServerSocket tcpServer = new ServerSocket(9090);

        //接受连接,传图片给连接的客户端,每个TCP连接都是一个java线程

        while(true){

            Socket clientSocket = tcpServer.accept();

            new TcpServer(clientSocket).start();

        }

    }

}

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.InetAddress;

import java.net.Socket;

public class TcpClient {

    public static void main(String[] args) throws IOException {

        // 建立TCP服务

        // 连接本机的TCP服务器

        Socket socket = new Socket(InetAddress.getLocalHost(), 9090);

        // 获得输入流

        InputStream inputStream = socket.getInputStream();

        // 写入数据

        FileOutputStream out = new FileOutputStream(new File("../save.jpg"));

        byte[] data = new byte[4096];

        int length = 0;

        while((length = inputStream.read(data)) != -1){

            out.write(data, 0, length);

        }

        //关闭资源

        out.close();

        socket.close();

    }

}