在FTPClient中对storeFileStream的第二次调用返回null

Question

我正在使用apache的commons-net FTPClient来上传文件.
我正在使用storeFileStream方法.
这适用于第一次调用但在第二次调用时返回null并.getReplyStrings()返回"200 PORT命令成功"!
我的代码是(在每个文件的循环中称为方法):

    FileInputStream fis = null;
    File LF=new File(localFilePath);
    InputStream is = new FileInputStream(LF);

    for(String DP:(remoteBasepath+"/"+remoteFilePath).split("/")){
        if(!client.changeWorkingDirectory(DP)){
            client.makeDirectory(DP);
            client.changeWorkingDirectory(DP);
        }
    }

    for(String line:client.getReplyStrings()){
        System.out.println(line);
    }
    OutputStream os = client.storeFileStream(LF.getName());
    byte[] buffer = new byte[1024];
    int len;
    System.out.println("start");
    long RBUN=0L;
    for(String line:client.getReplyStrings()){
        System.out.println(line);
    }
    while ((len = is.read(buffer)) != -1){
        os.write(buffer, 0, len);
        os.flush();
        RBUN+=len;
        CFPRGS.setValue(Math.round((RBUN*100/LF.length())));
    }
    for(String line:client.getReplyStrings()){
        System.out.println(line);
    }
    is.close();
    os.close();

问题是什么？

Answer 1

上传文件后我应该致电:

    client.completePendingCommand();