JAVA进行ftp操作（读取、下载、删除、切换路径）

package com.xgjk.cms.customer.service.service.util;
import com.xgjk.cms.customer.service.service.BaseService;
import com.xgjk.cms.customer.service.service.dto.HospitalLabelDTO;
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;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.*;
import java.net.MalformedURLException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
* @author lyd
* @date 2018/9/5 14:10
*/
@Service
public class FtpUtils extends BaseService {
   //ftp服务器地址
   @Value("${label.hostname}")
   private String hostname;
   //ftp服务器端口号默认为3379
   @Value("${label.port}")
   private Integer port;
   //ftp登录账号
   @Value("${label.username}")
   private String username;
   //ftp登录密码
   @Value("${label.password}")
   private String password;


   private FTPClient ftpClient = null;


   /**
    * 初始化ftp服务器
    */
   public void init() {
       ftpClient = new FTPClient();
       ftpClient.setControlEncoding("utf-8");
       try {
           System.out.println("connecting...ftp服务器:" + hostname + ":" + port);
           ftpClient.connect(hostname, port); //连接ftp服务器
           ftpClient.login(username, password); //登录ftp服务器
           int replyCode = ftpClient.getReplyCode(); //是否成功登录服务器
           if (!FTPReply.isPositiveCompletion(replyCode)) {
               System.out.println("connect failed...ftp服务器:" + hostname + ":" + port);
           }
           System.out.println("connect successfu...ftp服务器:" + hostname + ":" + port);
       } catch (MalformedURLException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

   /**
    * 下载文件 *
    *
    * @param pathname  FTP服务器文件目录 *
    * @param filename  文件名称 *
    * @param localpath 下载后的文件路径 *
    * @return
    */
   public boolean downloadFile(String pathname, String filename, String localpath) {
       ftpClient.enterLocalPassiveMode();
       boolean flag = false;
       OutputStream os = null;
       try {
           logger.info("开始下载文件");
           //切换FTP目录
           ftpClient.changeWorkingDirectory(pathname);
           FTPFile[] ftpFiles = ftpClient.listFiles();
           for (FTPFile file : ftpFiles) {
               if (filename.equalsIgnoreCase(file.getName())) {
                   File localFile = new File(localpath + file.getName());
                   os = new FileOutputStream(localFile);
                   ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
                   flag = ftpClient.retrieveFile(file.getName(), os);
                   if (!flag) {
                       logger.info("下载文件失败");
                   } else {
                       logger.info("下载文件成功");
                   }
                   os.close();
               }
           }
           ftpClient.logout();
       } catch (Exception e) {
           logger.info("下载文件失败" + e.getMessage());
           e.printStackTrace();
       } finally {
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
           if (null != os) {
               try {
                   os.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return flag;
   }

   /**
    * 删除文件 *
    *
    * @param filename 要删除的文件名称 *
    * @return
    */
   public boolean deleteFile(String filename, String pathname) {
       init();
       ftpClient.enterLocalPassiveMode();
       boolean flag = false;
       try {
           ftpClient.changeWorkingDirectory(pathname);
           System.out.println("开始删除文件");
           flag = ftpClient.deleteFile(pathname + filename);
           ftpClient.logout();
           System.out.println("删除文件成功");
       } catch (Exception e) {
           System.out.println("删除文件失败");
           e.printStackTrace();
       } finally {
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return flag;
   }


   /**
    * 递归遍历出目录下面所有文件
    *
    * @param pathName 需要遍历的目录，必须以"/"开始和结束
    * @throws IOException
    */
   public void list(String pathName, List arFiles) throws IOException {
       ftpClient.enterLocalPassiveMode();
       if (pathName.startsWith("/") && pathName.endsWith("/")) {
           String directory = pathName;
           //更换目录到当前目录
           this.ftpClient.changeWorkingDirectory(directory);
           FTPFile[] files = this.ftpClient.listFiles();
           for (FTPFile file : files) {
               if (file.isFile()) {
                   arFiles.add(directory + file.getName());
               } else if (file.isDirectory()) {
                   list(directory + file.getName() + "/", arFiles);
               }
           }
       }
   }

   /**
    * 递归遍历目录下面指定的文件名
    *
    * @param pathName 需要遍历的目录，必须以"/"开始和结束
    * @param ext      文件的扩展名
    * @throws IOException
    */
   public void list(String pathName, String ext, List arFiles) throws IOException {
       ftpClient.enterLocalPassiveMode();
       if (pathName.startsWith("/") && pathName.endsWith("/")) {
           String directory = pathName;
           //更换目录到当前目录
           this.ftpClient.changeWorkingDirectory(directory);
           FTPFile[] files = this.ftpClient.listFiles();
           for (FTPFile file : files) {
               if (file.isFile()) {
                   if (file.getName().endsWith(ext)) {
                       arFiles.add(file.getName());
                   }
               } else if (file.isDirectory()) {
                   list(directory + file.getName() + "/", ext, arFiles);
               }
           }
       }
   }
}