文件传输 客户端

/** * SocketServer从SocketClient接受文件名，将文件发送到SocketServer端保存！  *  *  */public class SocketClient { private static File f = null; private static FileInputStream fr = null; private static DataOutputStream dout = null; private static Socket s = null; public static void main(String[] args) {  SocketClient sc = new SocketClient();  sc.connectSocketServer(1234);  sc.sendFile("lizhi.txt"); } /**  * 连接服务器端  *   * @param port  *            要连接的服务器SocketServer端口  */ public void connectSocketServer(int port) {  try {   s = new Socket(InetAddress.getLocalHost(), port);  } catch (UnknownHostException e) {   e.printStackTrace();  } catch (IOException e) {   e.printStackTrace();  } } // 发送文件 public void sendFile(String str) {  byte[] b = new byte[1024];  f = new File(str);  try {   //数据输出流   dout = new DataOutputStream(new BufferedOutputStream(s     .getOutputStream()));      //文件读入流   fr = new FileInputStream(f);   int n = fr.read(b);   while (n != -1) {    //向网络中写入数据    dout.write(b, 0, n);    dout.flush();    //再次读取n字节    n = fr.read(b);   }      //关闭流   fr.close();   dout.close();  } catch (FileNotFoundException e) {   e.printStackTrace();  } catch (IOException e) {   e.printStackTrace();  } }}