连接登陆显示FTP目录文件的程序

最新推荐文章于 2021-08-09 13:31:37 发布

damnhe

最新推荐文章于 2021-08-09 13:31:37 发布

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文章标签： exception import login string user class

本文链接：https://blog.youkuaiyun.com/damnhe/article/details/653217

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import java.io.*;
import java.net.InetAddress;
import org.apache.commons.net.ftp.*;
import org.apache.commons.net.ftp.parser.*;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPFileEntryParser;

public class FtpDownload {
     private FTPClient ftp;

     public FtpDownload() {
         try {
             ftp = new FTPClient();
         }catch(Exception e) {
             e.printStackTrace();
         }
     }

     public void connect() {
          while(true) {
              String ip = "";
              try {
                  System.out.println("please enter the host IP you want to connect!");
                  BufferedReader inIP = new BufferedReader(new InputStreamReader(System.in));
                  ip = inIP.readLine();
                  ftp.connect(ip);
                  System.out.println("Connecting " + ip + " successful");
                  break;
              }catch (Exception e) {
                  System.out.println("Connecting " + ip + " failed");
                  e.printStackTrace();
              }
          }
     }

     public void login() {
         while(true) {
             try {
                 System.out.println("enter your username");
                 BufferedReader inUserName = new BufferedReader(new InputStreamReader(System.in));
                 String user = inUserName.readLine();
                 System.out.println("enter your password");
                 BufferedReader inPassword = new BufferedReader(new InputStreamReader(System.in));
                 String key = inPassword.readLine();
                 boolean login = ftp.login(user,key);
                 if(!login) {
                     System.out.println("the user isn't existed or uncorrect password!");
                 } else {
                     System.out.println("login success");
                     break;
                 }
             }catch(Exception e) {
                 e.printStackTrace();
             }
         }
     }

     public void getFiles() {
         try {
             FTPFile[] ftpFiles = ftp.listFiles();
             if(ftpFiles != null) {
                 for(int i = 0; i <ftpFiles.length; i++)
                     System.out.println(ftpFiles[i].getName());
             }
         }catch(Exception e) {
             e.printStackTrace();
         }
     }

     public static void main(String[] args) {
         FtpDownload ftpDownload = new FtpDownload();
         ftpDownload.connect();
         ftpDownload.login();
         ftpDownload.getFiles();
     }
}