FTPClient 上传下载文件

最新推荐文章于 2022-04-02 15:08:39 发布

原创最新推荐文章于 2022-04-02 15:08:39 发布 · 1k 阅读

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CC 4.0 BY-SA版权

文章标签：

#properties #ftp服务器 #string #null #file #exception

本文详细介绍了如何使用Apache Commons Net库进行FTP客户端操作，包括FTP连接建立、文件类型设置、文件读取与写入，以及异常处理机制。重点展示了通过FTPClient类实现文件的下载和上传过程。

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FTPClient 是基于commons-net.-1.4.jar的，利用FTPClient还需要几个jar，最好把common-*.jar都加上呵呵，如果遇到NOClassFoundException,就百度吧

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import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;

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;

import sun.net.TelnetInputStream;
import sun.net.ftp.FtpClient;

import com.telecom.js.cep.cepmanager.common.CommonConstants;
import com.telecom.js.cep.exception.BMOException;

public class FtpDownLoad {

   public static void main(String[] args) throws BMOException, IOException {
       FtpDownLoad manager = new FtpDownLoad();
       FTPClient ftpClient = manager.initConnectFtpServ(CommonConstants.prop);
       TelnetInputStream is = null;
       if (ftpClient.isConnected()) {
           // 设置文件类型（二进制）
           ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
           int reply = ftpClient.getReplyCode();
           if (!FTPReply.isPositiveCompletion(reply)) {
               ftpClient.disconnect();
           }
           ftpClient.changeWorkingDirectory("/usr/sfm/upload/crm/back/2011-07-20");// 转移到FTP服务器目录
           FTPFile[] fs = ftpClient.listFiles();
           String filename = fs[0].getName();//取其中第一个文件
           System.out.println(filename);
           OutputStream fos = new FileOutputStream("c:\\test\\"+filename);
            ftpClient.retrieveFile(filename, fos);
            if(fos!=null){
               fos.close();
            }
       }
       ftpClient.disconnect();
   }

   // 初始化FTP连接
   public FTPClient initConnectFtpServ(Properties prop) throws BMOException {
       FTPClient ftpClient = new FTPClient();
       try {
           ftpClient.connect(prop.getProperty("FTP_SERVER_IP"));
           ftpClient.login(prop.getProperty("FTP_USER_NAME"), prop
                   .getProperty("FTP_PWD"));
           ftpClient.setBufferSize(CommonConstants.BUFFER_SIZE);
           ftpClient.setControlEncoding("UTF-8");
           FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
           conf.setServerLanguageCode("zh");
       } catch (IOException e) {
           throw new BMOException("初始化FTP连接异常:" + e);
       }
       return ftpClient;
   }



}

上传

    // 初始化FTP连接
   public FTPClient initConnectFtpServ(Properties prop) throws BMOException {
       FTPClient ftpClient = new FTPClient();
       try {
           ftpClient.connect(prop.getProperty("FTP_SERVER_IP"));
           ftpClient.login(prop.getProperty("FTP_USER_NAME"), prop
                   .getProperty("FTP_PWD"));
           ftpClient.setBufferSize(CommonConstants.BUFFER_SIZE);
           ftpClient.setControlEncoding("UTF-8");
           // 设置文件类型（二进制）
           ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
       } catch (IOException e) {
           throw new BMOException("初始化FTP连接异常:" + e);
       }
       return ftpClient;
   }

   // 上传数据至集团接口，不往上抛异常
   public boolean uploadFileToFtpServ(Properties prop,
           String remoteUploadPath, String fileName) {
       FileInputStream fis = null;
       FTPClient ftpClient = null;
       boolean success = false;
       File srcFile = new File(fileName);
       try {
           ftpClient = initConnectFtpServ(prop);
           if (ftpClient.isConnected()) {
               logger.debug("localUploadPath + fileName:" + fileName);
               if (srcFile.exists()) {
                   fis = new FileInputStream(srcFile);
                   ftpClient.changeWorkingDirectory(remoteUploadPath);
                   ftpClient.storeFile(srcFile.getName(), fis);
                   success = true;
               }
           }
       } catch (IOException e) {
           logger.error("上传异常", e);
       } catch (BMOException e) {
           logger.error("FTP初始化异常", e);
       } finally {
           try {
               closeFtpConnection(ftpClient);
               if (fis != null) {
                   fis.close();
               }
           } catch (Exception e) {
               // 此时文件已经上传成功
               success = true;
               logger.error("IO关闭异常", e);
           }
       }
       return success;
   }