FTP将文件传输到服务器，但结果以零字节大小到达 [英] FTP a file to server, but it the result arrives with zero byte size

问题描述

我正在使用FTPClient将文件上传到数据库服务器。它显示文件已成功传输，但文件为空（大小为0字节）。

以下是我用来构建的源代码。任何人都可以解决这个问题吗？

  package示例; 
 
 import org.apache.commons.net.ftp。*; 
 import java.io.FileInputStream; 
 import java.io.IOException; 
 
 public class Main {
 
 public static void main（String [] args）{
 
 FTPClient client = new FTPClient（）; 
 FileInputStream fis = null; 
 
尝试{
 
 client.connect（server）; 
 client.login（userid，password）; 
 System.out.print（Message：+ client.getReplyString（））; 
 
 client.changeWorkingDirectory（/ loaddata）; 
 System.out.println（工作目录+ client.printWorkingDirectory（））; 
 
 client.setDefaultPort（22）; 
 int f1 = client.getDefaultPort（）; 
布尔值f2 = client.setFileType（FTPClient.BINARY_FILE_TYPE）; 
 System.out.println（File transfer port no+ f1）; 
 System.out.println（FTP服务器回复。+ client.getReplyString（））; 
 
字符串localfile =c：/Touch.txt; 
 fis = new FileInputStream（localfile）; 
 int lastSlash = localfile.lastIndexOf（'/'）; 
 String filename = localfile.substring（lastSlash + 1）; 
 System.out.println（file：+ fis）; 
 
 client.setFileTransferMode（2）; 
 System.out.println（Flag reply。+ client.getReplyString（））; 
 
 boolean flag = client.storeFile（filename，fis）; 
 
 System.out.println（Flag reply。+ client.getReplyString（））; 
 
 if（flag）{
 System.out.println（成功上传文件）; 
} else {
 System.out.println（无法上传文件）; 
} 
 
 fis.close（）; 
 client.logout（）; 
 System.out.println（Logout。+ client.getReplyString（））; 
 
} catch（Exception e）{
 System.out.println（Exception+ e）; 
} finally {
 if（client.isConnected（））{
 try {
 client.disconnect（）; 
 System.out.println（Server Disconnected。+ client.getReplyString（））; 
} catch（IOException ioe）{
 // do not 
} 
} 
} 
} 
} 
  




解决方案

我删除了
client.changeWorkingDirectory（/ loaddata）;
，否则保持原样并取得成功。线路是否会成为问题？
再次使用了commons 3.1

I am tring to upload a file to a database server using FTPClient. It shows the file is transfered succesfully, but the file is empty (size 0 bytes).

Below is the source code that I have used to build. Can anyone resolve this issue?

package Examples;

import org.apache.commons.net.ftp.*;
import java.io.FileInputStream;
import java.io.IOException;

public class Main {

    public static void main(String[] args) {

        FTPClient client = new FTPClient();
        FileInputStream fis = null;

        try {

            client.connect("server");
            client.login("userid", "password");
            System.out.print("Message : " + client.getReplyString());

            client.changeWorkingDirectory("/loaddata");
            System.out.println("Working Directory" + client.printWorkingDirectory());

            client.setDefaultPort(22);
            int f1 = client.getDefaultPort();
            boolean f2 = client.setFileType(FTPClient.BINARY_FILE_TYPE);
            System.out.println("File transfer port no  " + f1);
            System.out.println("FTP server reply ." + client.getReplyString());

            String localfile = "c:/Touch.txt";
            fis = new FileInputStream(localfile);
            int lastSlash = localfile.lastIndexOf('/');
            String filename = localfile.substring(lastSlash+1);
            System.out.println("file : "+fis);

            client.setFileTransferMode(2);
            System.out.println("Flag reply ." + client.getReplyString());

            boolean flag = client.storeFile(filename,fis);

            System.out.println("Flag reply ." + client.getReplyString());

            if (flag) {
                System.out.println("Successfully uploaded the file");
            } else {
                System.out.println("Not able to upload the file");
            }

            fis.close();
            client.logout();
            System.out.println("Logout ." + client.getReplyString());

        } catch (Exception e) {
            System.out.println("Exception " + e);
        } finally {
            if (client.isConnected()) {
                try {
                    client.disconnect();
                    System.out.println("Server Disconnected." + client.getReplyString());
                } catch (IOException ioe) {
                    // do nothing
                }
            }
        }
    }
}

解决方案

I removed the client.changeWorkingDirectory("/loaddata"); otherwise left it all intact and got success. Could the line be a problem? Than again I used commons 3.1

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