利用Apache的commons-net实现FTP的文件读取、上传、下载、删除和移动功能

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

public class FtpTest {
 @SuppressWarnings("deprecation")
    public static void main(String[] args) {
    String server = "192.168.1.103";
    String user = "admin";
    String password = "pass";
    boolean error = false;
    FTPClient ftp = new FTPClient();
    ftp.setControlEncoding("UTF-8"); // 中文支持
    ftp.setConnectTimeout(5000); // 超时设置

    try {
     int reply;
        ftp.connect(server);
        System.out.println("Connected to " + server + ".");
        System.out.println(ftp.getReplyString());

        // After connection attempt, you should check the reply code to verify success.
        reply = ftp.getReplyCode();
        if (!FTPReply.isPositiveCompletion(reply)) {
         ftp.disconnect();
            System.err.println("FTP server refused connection.");
            System.exit(1);
            }
       
        ftp.login(user, password);
        System.out.println("Login by " + user + ".");
   System.out.println(ftp.getReplyString());

   reply = ftp.getReplyCode();
   if (!FTPReply.isPositiveCompletion(reply)) {
    ftp.disconnect();
    System.err.println("Invalid username or password.");
    System.exit(1);
   } else {
    System.out.println(ftp.getSystemName());

    FTPClientConfig conf = new FTPClientConfig(ftp.getSystemName()
      .split(" ")[0]);
    conf.setServerLanguageCode("zh");
    ftp.configure(conf);

    ftp.enterLocalPassiveMode(); // Use passive mode as default
            // because most of us are behind
            // firewalls these days.
    ftp.setFileType(FTP.BINARY_FILE_TYPE); // 二进制文件支持
   }

   // transfer files
   FTPFile[] files = ftp.listFiles("/Upload");
   ftp.changeWorkingDirectory("/Upload");
   for (FTPFile file : files) {
    String fileName = file.getName();
    System.out.println((file.isDirectory() ? "Folder" : (file
      .isFile() ? "File" : ""))
      + " - " + fileName);

    if (file.isFile()) {
     // 读取ftp上指定文件的数据
     InputStream is = ftp.retrieveFileStream(fileName);
     if (is != null) {
      BufferedReader reader = new BufferedReader(
        new InputStreamReader(is));
      String line;
      while ((line = reader.readLine()) != null) {
       System.out.println("\t" + line);
      }
      reader.close();
      is.close();

      System.out.println(ftp.getReplyString());
      // Must call completePendingCommand() to finish command.
      if (!ftp.completePendingCommand()) {
       ftp.logout();
       ftp.disconnect();
       System.err.println("File transfer failed.");
       System.exit(1);
      }
     }

     // 下载ftp上指定文件到本地
     File localFile = new File("F:" + File.separator + fileName);
     boolean downloaded = ftp.retrieveFile(fileName,
       new FileOutputStream(localFile));
     System.out.println(downloaded ? "File " + fileName
       + " download success" : "File " + fileName
       + " download failure");
     System.out.println(ftp.getReplyString());

     // 删除ftp上指定文件
     boolean deleted = ftp.deleteFile(fileName);
     System.out.println(deleted ? "File " + fileName
       + " delete success" : "File " + fileName
       + " delete failure");
     System.out.println(ftp.getReplyString());

     System.out.println("--------------------------------");
    }
   }

   // 上传本地文件到ftp指定目录
   String uploadFileName = "HFSetup5.4.4.422.exe";
   File uploadFile = new File("F:" + File.separator + "TDDOWNLOAD"
     + File.separator + uploadFileName);
   boolean uploaded = ftp.storeFile(uploadFileName,new FileInputStream(uploadFile));
   System.out.println(uploaded ? "File " + uploadFileName + " upload success" : "File " + uploadFileName + " upload failure");
   System.out.println(ftp.getReplyString());

   // 在ftp上更改文件名、移动文件
   boolean moved = ftp.rename("/Upload" + File.separator + uploadFileName, "/Success" + File.separator + uploadFileName);
   System.out.println(moved ? "File " + uploadFileName + " move success" : "File " + uploadFileName + " move failure");
   System.out.println(ftp.getReplyString());
  } catch (Exception e) {
   error = true;
   e.printStackTrace();
  } finally {
   if (ftp.isConnected()) {
    try {
     ftp.disconnect();
    } catch (IOException e) {
     // do nothing
    }
   }
   System.exit(error ? 1 : 0);
  }
 }
}