从 FTP 服务器检索 Java 文件

Question

我试图从 ftp 服务器检索文件，但收到如下错误。请你帮帮我好吗

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.ObjectInputStream.GetField;

import java.io.OutputStream;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import org.apache.commons.net.ftp.FTP;

import org.apache.commons.net.ftp.FTPClient;

import org.apache.commons.net.ftp.FTPFile;

import org.apache.commons.net.ftp.FTPReply;

public class FtpTest_V1 {

public static void main(String[] args) {

    String server = "192.168.200.8";

    int port = 21;

    String user = "Test_user";

    String pass = "123456**";

    FileOutputStream fos = null; 

   FTPClient ftpClient = new FTPClient();

   try {

          ftpClient.connect(server, port);

          showServerReply(ftpClient);

          ftpClient.enterLocalPassiveMode();


          int replyCode = ftpClient.getReplyCode();

          System.out.println(replyCode);


          //isPositiveCompletion

          if (!FTPReply.isPositiveCompletion(replyCode)) {

              System.out.println(FTPReply.isPositiveCompletion(replyCode));

              System.out.println(FTPReply.isNegativeTransient(replyCode));

              System.out.println("Connect failed");

              return;

          }

          boolean success = ftpClient.login(user, pass);

          //System.out.println(success);

          showServerReply(ftpClient);     

          if (!success) {

              System.out.println("Could not login to the server");

              return;

          }

          // Lists files and directories

          FTPFile[] files1 = ftpClient.listFiles("TEST2");

          //printFileDetails(files1);                      

          // uses simpler methods

          String[] files2 = ftpClient.listNames("TEST2");

         printNames(files2);

         String[] files = files2;

         for (String aFile: files) {

         String filename = aFile; 

         fos = new FileOutputStream(filename); 

    // Download file from FTP server

   ftpClient.retrieveFile("C://test//FTP_TEST//GET" + filename, >fos); 

          }              

      }       

        catch (IOException ex) {

          System.out.println("An Error Occured"+ex.getMessage());

          System.out.println("Warning! Something wrong happened");

          ex.printStackTrace();

      } finally {

          // logs out and disconnects from server

          try {

              if (fos != null) { 

                  fos.close(); 

                }  

              if (ftpClient.isConnected()) {

                  ftpClient.logout();

                  ftpClient.disconnect();

              }

          } catch (IOException ex) {

              ex.printStackTrace();

          }

      }

  }

  private static void printNames(String files[]) {

      if (files != null && files.length > 0) {

          int i =0;

          for (String aFile: files) {

               i++;

          }

          System.out.println("Number of files = "+i);

          for (String aFile: files) {

              System.out.println(aFile);

          }

      }
  }

  private static void showServerReply(FTPClient ftpClient) {

      String[] replies = ftpClient.getReplyStrings();

      if (replies != null && replies.length > 0) {

          for (String aReply : replies) {

              System.out.println("SERVER : " + aReply);

          }

      }    

}

}

这是我的输出:

SERVER : 220-FileZilla Server version 0.9.43 beta

SERVER : 220 Hello FTP SERVER

220

SERVER : 230 Logged on

number of files = 2

TEST2/testfile.csv

TEST2/tttt.csv

An Error OccuredTEST2\testfile.csv (The system cannot find the path specified)

Warning! Something wrong happened

java.io.FileNotFoundException: TEST2\testfile.csv (The system cannot find the path specified)

at java.io.FileOutputStream.open(Native Method)

at java.io.FileOutputStream.(Unknown Source)

at java.io.FileOutputStream.(Unknown Source)

at FtpTest_V1.main(FtpTest_V1.java:74)

Answer 1

斜杠应该像这样向后:“C:\\test\\FTP_TEST\\GET”(没有中间空格，我这样写是因为这个页面中的html解析器将其更改为只有一个斜杠)而不是:

ftpClient.retrieveFile("C://test//FTP_TEST//GET" + filename, >fos); 

或者更好:

"C:" + File.separatorChar + "test" + File.separatorChar + "FTP_TEST" + File.separatorChar + "GET"