Apache Commons FTP 问题

问题描述

我想用 Apache Commons Net 实现一个 FTP 客户端，仅用于上传数据.FTP 服务器的连接和登录工作正常.但是上传不正常.这些文件与原件相比有点大.并且文件已损坏.我尝试了图像、视频和文本文件.只有文本文件没问题.

I want to implement a FTP Client with Apache Commons Net only for uploading data. The Connection and Login to FTP-Server works fine. But the upload does not work right. The files are a little to big as the originals. And the files are damaged. I tried an image, a video and a textfile. Only the textfile is alright.

现在我在调试时看到了

boolean tmp=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);

给我 false.所以不能设置.为什么?(也许这不是问题?)

gives me false. So it can not be set. Why? (Maybe this is not the problem?)

这是我的其余代码

client=new FTPClient();

    try {           
        int reply;
        client.connect(url, port);
        reply = client.getReplyCode();

        if (!FTPReply.isPositiveCompletion(reply))
        {
            client.disconnect();
            System.err.println("FTP server refused connection.");
            System.exit(1);
        }


        client.login(user, pw);
        boolean xxx=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);
        client.setControlKeepAliveTimeout(300);
        client.enterLocalPassiveMode();

if (client.isConnected())
    {
    try {
        File file=new File(<FILE>);
        FileInputStream inputStream = new FileInputStream(file);
        OutputStream outputStream = client.storeFileStream(file.getName());

          byte[] buffer = new byte[4096];
          int l;
       while((l = inputStream.read(buffer))!=-1)
               {
                outputStream.write(buffer, 0, l);
            }

          inputStream.close();
          outputStream.flush();
          outputStream.close();}

推荐答案

更改如下:

boolean xxx=client.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);

应该是:

boolean xxx=client.setFileType(FTP.BINARY_FILE_TYPE);

您将 FileTransferModes 与 FileTypes 混淆了.

You have confused FileTransferModes with FileTypes.

可用的文件类型有:

• FTP.ASCII_FILE_TYPE(默认)
• FTP.BINARY_FILE_TYPE
• FTP.EBCDIC_FILE_TYPE
• FTP.LOCAL_FILE_TYPE

可用的 FileTransferMode 有:

The available FileTransferModes are:

• FTP.STREAM_TRANSFER_MODE(默认)
• FTP.BLOCK_TRANSFER_MODE
• FTP.COMPRESSED_TRANSFER_MODE

我想如果 apache 为这些常量类型引入了枚举，那么可以避免这种问题，但是该库将无法用于 pre-java-5 运行时.
我想知道 java 1.4 兼容性到底有多大问题.

I suppose if apache introduced enums for these constant types, then this kind of problem could be avoided, but then the library would not be available to pre-java-5 runtimes.
I wonder how much of an issue java 1.4 compatibility really is.

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