无法将UploadedFile上传到FTP服务器？ [英] Unable to upload UploadedFile to FTP Server?

问题描述

当我尝试上传 UploadedFile 对象内容到FTP服务器
[它的值从[t：inputFileUpload]组件获取]

在我的Web浏览器中的加载指示器播放并不会停止

当调试时，我发现我的来临冻结在一行

ftp.storeFile （destFilePath，inputStream）;
然而，我尝试3种方法（代码中显示）上传

，但仍然所有方法都无法正常工作

UploadedFile到FTPServer的控制器方法

  public static String uploadFileToFTPServer 
（String ftpServerIP，String userName，String密码，UploadedFile uploadedFile）{
 
 String destFilePath = null; 
 FTPClient ftp = new FTPClient（）; 
 
 ftp.addProtocolCommandListener（new PrintCommandListener（
 new PrintWriter（System.out）））; 
尝试{
 
 //方法1 
 byte [] fileBytesContent = uploadedFile.getBytes（）; 
 ByteArrayInputStream inputStream = new ByteArrayInputStream（fileBytesContent）; 
 
 //方法2 
 // InputStream inputStream = uploadedFile.getInputStream（）; 
 
 //方法3 
 // InputStream inputStreamContent = uploadedFile.getInputStream（）; 
 // BufferedInputStream inputStream = new BufferedInputStream（inputStreamContent）; 
 
 destFilePath = uploadedFile.getName（）; 
 
 // ftp服务器
 ftp.connect（ftpServerIP）; 
 ftp.login（userName，password）; 
 ftp.setFileType（FTPClient.BINARY_FILE_TYPE）; 
 ftp.setFileTransferMode（FTPClient.BINARY_FILE_TYPE）; 
 ftp.storeFile（destFilePath，inputStream）; 
 
 inputStream.close（）; 
 ftp.logout（）; 
 
} catch（Exception e）{
 destFilePath = null; 
 e.printStackTrace（）; 
 
} finally {
 try {
 ftp.disconnect（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
} 
返回destFilePath; 
} 
  

注意

当Freeze检查我的FTP服务器

然后看到文件名BUT其大小=零!!

然后几秒钟后这个文件将消失

解决方案

/ strong>

防火墙在本地机器上运行

那是为什么？

因为在开发环境中
我的机器被模拟为一个web服务器（因为它运行本地服务器）

和我的应用程序需要将文件写入 FTP服务器

因此需要获得与（FTP服务器）通信的权限

防火墙只允许与确定的（服务器：端口）连接
并且默认情况下，防火墙阻止FTP连接（AnyServer ：20 / AnyServer：21）

解决方案

因此，当我禁用防火墙

问题解决

When i try to upload UploadedFile object content To FTP server
[That its value get from [t:inputFileUpload] component]
The loading indicator in my web browser play and will not stop
When debug i found that my come freezes in a line
ftp.storeFile(destFilePath, inputStream); However i try 3 methods (shown in code) to upload
BUT still all methods not working

Controller method that UploadedFile to FTPServer

public static String uploadFileToFTPServer
    (String ftpServerIP, String userName, String password,UploadedFile uploadedFile) {

    String destFilePath = null;
    FTPClient ftp = new FTPClient();

    ftp.addProtocolCommandListener(new PrintCommandListener(
            new PrintWriter(System.out)));
    try {

        // Method 1
        byte[] fileBytesContent = uploadedFile.getBytes();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(fileBytesContent);

        // Method 2
//          InputStream inputStream  = uploadedFile.getInputStream();

        // Method 3
//          InputStream inputStreamContent  = uploadedFile.getInputStream();
//          BufferedInputStream inputStream = new BufferedInputStream(inputStreamContent);

        destFilePath = uploadedFile.getName() ;

        // ftp server
        ftp.connect(ftpServerIP);
        ftp.login(userName, password);
        ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
        ftp.setFileTransferMode(FTPClient.BINARY_FILE_TYPE);
        ftp.storeFile(destFilePath, inputStream);

        inputStream.close();
        ftp.logout();

    } catch (Exception e) {
        destFilePath = null;             
        e.printStackTrace();

    } finally {
        try {
            ftp.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return destFilePath;
}

Note
When Freeze i check the my FTP server
And see the file name BUT its size = zero !!
Then after some seconds this file will disappeared

解决方案

The Problem Reason
Firewall in local machine is running

Thats Why ?
Because In development environment
My machine is simulated as a web server (Because thats run local server)
And my application need to write a file to a FTP server
So need to take a privilege to communicate with (FTP server)
The firewall ONLY allow connections with determined (Servers:Ports)
And By default firewall prevent FTP connections (AnyServer:20 / AnyServer:21)

Solution
So when i disabled Firewall
The problem resolved

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