Java TCP服务端向客户端发送图片

/**
 * 1、创建TCP服务端，TCP客户端
 * 2、服务端等待客户端连接，客户端连接后，服务端向客户端写入图片
 * 3、客户端收到后进行文件保存
 * @author Administrator
 *
 */
public class ServerTcpListener implements Runnable{

    public static void main(String[] args) {

        try {
            final ServerSocket server = new ServerSocket(33456);
            
            
            Thread th = new Thread(new Runnable() {
                public void run() {
                    while (true) {
                        try {
                            System.out.println("开始监听...");
                            Socket socket = server.accept();
                            System.out.println("有链接");
                            send(socket);
                        } catch (Exception e) {
                        }
                    }
                }
            });

            th.run(); //启动线程运行
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    @Override
    public void run() {
        
    }
    
    public static void send(Socket socket) {
        byte[] inputByte = null;
        int length = 0;
        DataOutputStream dos = null;
        FileInputStream fis = null;
        try {
            try {
                File file = new File("D:/1.png");
                fis = new FileInputStream(file);
                dos = new DataOutputStream(socket.getOutputStream());
                
                inputByte = new byte[1024];
                while ((length = fis.read(inputByte, 0, inputByte.length)) > 0) {
                    dos.write(inputByte, 0, length);
                    dos.flush();
                }
               
            } finally {
                if (fis != null)
                    fis.close();
                if (dos != null)
                    dos.close();
                if (socket != null)
                    socket.close();
            }
        } catch (Exception e) {
        }
    }
}

public class ClientTcpReceive {

    public static void main(String[] args) {

            int length = 0;
            byte[] receiveBytes = null;
            Socket socket = null;
            DataInputStream dis = null;
            FileOutputStream fos = null;

            try {
                try {
                    socket = new Socket("127.0.0.1", 33456);
                    
                    dis = new DataInputStream(socket.getInputStream());
                    fos = new FileOutputStream(new File("1.png"));
                   
                    receiveBytes = new byte[1024];
                    System.out.println("开始接收数据...");
                    while ((length = dis.read(receiveBytes, 0, receiveBytes.length)) > 0) {
                        System.out.println(length);
                        fos.write(receiveBytes, 0, length);
                        fos.flush();
                    }
                    System.out.println("完成接收");
                } finally {
                    if (dis != null)
                        dis.close();
                    if (fos != null)
                        fos.close();
                    if (socket != null)
                        socket.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
    }

}