springboot集成ftp
pom依赖包
1 <dependency> 2 <groupId>commons-net</groupId> 3 <artifactId>commons-net</artifactId> 4 <version>3.6</version> 5 </dependency>
ftp登录初始化
private FTPClient connectFtpServer(){ FTPClient ftpClient = new FTPClient(); ftpClient.setConnectTimeout(1000*30);//设置连接超时时间 ftpClient.setControlEncoding("utf-8");//设置ftp字符集 ftpClient.enterLocalPassiveMode();//设置被动模式，文件传输端口设置 try { ftpClient.setFileType(FTP.BINARY_FILE_TYPE);//设置文件传输模式为二进制，可以保证传输的内容不会被改变 ftpClient.connect(url); ftpClient.login(userName,password); int replyCode = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(replyCode)){ LOGGER.error("connect ftp {} failed",url); ftpClient.disconnect(); return null; } LOGGER.info("replyCode==========={}",replyCode); } catch (IOException e) { LOGGER.error("connect fail ------->>>{}",e.getCause()); return null; } return ftpClient; }
ftp上传文件
1 /** 2 * 3 * @param inputStream 待上传文件的输入流 4 * @param originName 文件保存时的名字 5 */ 6 public void uploadFile(InputStream inputStream, String originName){ 7 FTPClient ftpClient = connectFtpServer(); 8 if (ftpClient == null){ 9 return; 10 } 11 12 try { 13 ftpClient.changeWorkingDirectory(remoteDir);//进入到文件保存的目录 14 Boolean isSuccess = ftpClient.storeFile(originName,inputStream);//保存文件 15 if (!isSuccess){ 16 throw new BusinessException(ResponseCode.UPLOAD_FILE_FAIL_CODE,originName+"---》上传失败！"); 17 } 18 LOGGER.info("{}---》上传成功！",originName); 19 ftpClient.logout(); 20 } catch (IOException e) { 21 LOGGER.error("{}---》上传失败！",originName); 22 throw new BusinessException(ResponseCode.UPLOAD_FILE_FAIL_CODE,originName+"上传失败！"); 23 }finally { 24 if (ftpClient.isConnected()){ 25 try { 26 ftpClient.disconnect(); 27 } catch (IOException e) { 28 LOGGER.error("disconnect fail ------->>>{}",e.getCause()); 29 } 30 } 31 } 32 }
ftp读取文件，并转成base64
1 /** 2 * 读ftp上的文件，并将其转换成base64 3 * @param remoteFileName ftp服务器上的文件名 4 * @return 5 */ 6 public String readFileToBase64(String remoteFileName){ 7 FTPClient ftpClient = connectFtpServer(); 8 if (ftpClient == null){ 9 return null; 10 } 11 12 String base64 = ""; 13 InputStream inputStream = null; 14 15 try { 16 ftpClient.changeWorkingDirectory(remoteDir); 17 FTPFile[] ftpFiles = ftpClient.listFiles(remoteDir); 18 Boolean flag = false; 19 //遍历当前目录下的文件，判断要读取的文件是否在当前目录下 20 for (FTPFile ftpFile:ftpFiles){ 21 if (ftpFile.getName().equals(remoteFileName)){ 22 flag = true; 23 } 24 } 25 26 if (!flag){ 27 LOGGER.error("directory：{}下没有 {}",remoteDir,remoteFileName); 28 return null; 29 } 30 //获取待读文件输入流 31 inputStream = ftpClient.retrieveFileStream(remoteDir+remoteFileName); 32 33 //inputStream.available() 获取返回在不阻塞的情况下能读取的字节数，正常情况是文件的大小 34 byte[] bytes = new byte[inputStream.available()]; 35 36 inputStream.read(bytes);//将文件数据读到字节数组中 37 BASE64Encoder base64Encoder = new BASE64Encoder(); 38 base64 = base64Encoder.encode(bytes);//将字节数组转成base64字符串 39 LOGGER.info("read file {} success",remoteFileName); 40 ftpClient.logout(); 41 } catch (IOException e) { 42 LOGGER.error("read file fail ----->>>{}",e.getCause()); 43 return null; 44 }finally { 45 if (ftpClient.isConnected()){ 46 try { 47 ftpClient.disconnect(); 48 } catch (IOException e) { 49 LOGGER.error("disconnect fail ------->>>{}",e.getCause()); 50 } 51 } 52 53 if (inputStream != null){ 54 try { 55 inputStream.close(); 56 } catch (IOException e) { 57 LOGGER.error("inputStream close fail -------- {}",e.getCause()); 58 } 59 } 60 61 } 62 63 return base64; 64 65 }
ftp下载文件
1 /** 2 * 文件下载 3 * @param remoteFileName ftp上的文件名 4 * @param localFileName 本地文件名 5 */ 6 public void download(String remoteFileName,String localFileName){ 7 FTPClient ftpClient = connectFtpServer(); 8 if (ftpClient == null){ 9 return ; 10 } 11 12 OutputStream outputStream = null; 13 14 try { 15 ftpClient.changeWorkingDirectory(remoteDir); 16 FTPFile[] ftpFiles = ftpClient.listFiles(remoteDir); 17 Boolean flag = false; 18 //遍历当前目录下的文件，判断是否存在待下载的文件 19 for (FTPFile ftpFile:ftpFiles){ 20 if (ftpFile.getName().equals(remoteFileName)){ 21 flag = true; 22 break; 23 } 24 } 25 26 if (!flag){ 27 LOGGER.error("directory：{}下没有 {}",remoteDir,remoteFileName); 28 return ; 29 } 30 31 outputStream = new FileOutputStream(localDir+localFileName);//创建文件输出流 32 33 Boolean isSuccess = ftpClient.retrieveFile(remoteFileName,outputStream); //下载文件 34 if (!isSuccess){ 35 LOGGER.error("download file 【{}】 fail",remoteFileName); 36 } 37 38 LOGGER.info("download file success"); 39 ftpClient.logout(); 40 } catch (IOException e) { 41 LOGGER.error("download file 【{}】 fail ------->>>{}",remoteFileName,e.getCause()); 42 }finally { 43 if (ftpClient.isConnected()){ 44 try { 45 ftpClient.disconnect(); 46 } catch (IOException e) { 47 LOGGER.error("disconnect fail ------->>>{}",e.getCause()); 48 } 49 } 50 51 if (outputStream != null){ 52 try { 53 outputStream.close(); 54 } catch (IOException e) { 55 LOGGER.error("outputStream close fail ------->>>{}",e.getCause()); 56 } 57 } 58 } 59 }
ftp客户端与服务端之间数据传输，主动模式和被动模式
请移至这个哥们的博文中查看，https://www.cnblogs.com/mawanglin2008/articles/3607767.html，写的非常好。
主动模式：ftp客户端产生一个随机端口，并告知ftp服务端，最后服务端的20端口会与这个随机端口建立连接，进行数据传输
被动模式：ftp服务端产生一个随机端口，并告知ftp客户端，最后客户端与这个随机端口建立连接，进行数据传输