服务器连接成功、只是服务器端不接收文件内容、一直等待Socket dataSocket = serverDataSocket.accept();

Question

package test;import java.io.*;
import java.net.*;public class HelloWordFTP {
  private static final int CTRLPORT  = 21; 
  private static Socket ctrlSocket; 
  private static PrintWriter ctrlOutput; 
  private static BufferedReader ctrlInput;
  private static byte[] localHostAddress;   public static void main(String[] args) {
    try {
      String host = "10.36.254.27";
      String loginName = "eptftp";
      String password = "ept";
      String dirName = "/Inetpub/ftproot/userhome/Localuser/eptftp";
      String fileName = "C:\\temp\\Seikyusyo.txt";     
      ctrlSocket = new Socket(host, CTRLPORT);
      System.out.println("dd");
      localHostAddress = ctrlSocket.getLocalAddress().getAddress();
      ctrlOutput = new PrintWriter(ctrlSocket.getOutputStream());
      ctrlInput = new 
        BufferedReader(new InputStreamReader(ctrlSocket.getInputStream()));      ctrlOutput.println("USER " + loginName);
      ctrlOutput.flush();
      ctrlOutput.println("PASS " + password);
      ctrlOutput.flush();      ctrlOutput.println("CWD " + dirName);
      ctrlOutput.flush();
      ctrlOutput.println("TYPE I");
      ctrlOutput.flush();
      System.out.println("write begin");
 
      FileInputStream fis = new FileInputStream(fileName);
      Socket dataSocket = dataConnection("STOR " + fileName);
      OutputStream outstr = dataSocket.getOutputStream();
      int n;
      byte[] buff = new byte[1024];
            while ((n = fis.read(buff)) > 0) {
        outstr.write(buff,0,n);
        System.out.println(n);
      }
      dataSocket.close();
      fis.close();
      System.out.println("write end");
      ctrlOutput.close();
      ctrlInput.close();
      ctrlSocket.close();
    }catch (Exception e) {
      e.printStackTrace();
    }
  }  private static Socket dataConnection(String ctrlcmd) 
      throws IOException,UnknownHostException {
    String cmd = "PORT ";
    ServerSocket serverDataSocket = new ServerSocket(0,1);
    for (int i=0;i<4;i++) {
      cmd = cmd + (localHostAddress[i] & 0xff) + ",";
    }
    cmd = cmd + (((serverDataSocket.getLocalPort())/256) & 0xff)
              + ","
              + (serverDataSocket.getLocalPort() & 0xff);    ctrlOutput.println(cmd);
    ctrlOutput.flush();
    ctrlOutput.println(ctrlcmd);
    ctrlOutput.flush();    Socket dataSocket = serverDataSocket.accept();
    serverDataSocket.close();
    return dataSocket;  }
}

Answer 1

你的数据发送到21端口，你的服务器端在哪监听呢？？ServerSocket serverDataSocket = new ServerSocket(0,1);　//????