java如何使用ftp下载远程服务器文件
作者:Dubbo-罗
Java通过FTP下载文件主要有两种方式:第一种是直接在连接中包含账号和密码进行远程下载;第二种是登录后使用账号和密码进行下载,这些方法适用于需要从远程服务器获取文件的场景
java使用ftp下载远程服务器文件
第一种方法
连接中带有账号密码直接远程下载:
public Result<?> download(){ //进行下载文件---------------------------------开始 //远程服务器下载地址 String fileurl = "ftp://superAdmin:superAdmin123@192.168.1.8:8888/usr/mp4pt/rec/CHN0/10110120011100/00001.mp4"; //文件物理路径 String realfilepath = "F:/rhsftdemo/00001.mp4"; //本地中新建文件夹目录 File file = new File("F:/rhsftdemo/"); if (!file.exists()) { file.mkdirs(); } log.info("存储路径realfilepath:" + realfilepath + "下载路径:" + fileurl); download(fileurl,realfilepath); return Result.ok(); } private static final int BUFFER_SIZE = 4096; public void download(String ftpUrl,String savePath){ long startTime = System.currentTimeMillis(); // String ftpUrl = "ftp://ftp.f-secure.com/misc/unixutil/skeysrcs.zip"; String file = ""; // name of the file which has to be download String host = ""; // ftp server String user = ""; // user name of the ftp server String pass = ""; // password of the ftp server // String savePath = "F:\\skeysrcs.zip"; ftpUrl = String.format(ftpUrl, user, pass, host); System.out.println("Connecting to FTP server"); try { URL url = new URL(ftpUrl); URLConnection conn = url.openConnection(); InputStream inputStream = conn.getInputStream(); long filesize = conn.getContentLength(); System.out.println("Size of the file to download in kb is:-" + filesize / 1024); FileOutputStream outputStream = new FileOutputStream(savePath); byte[] buffer = new byte[BUFFER_SIZE]; int bytesRead = -1; while ((bytesRead = inputStream.read(buffer)) != -1) { outputStream.write(buffer, 0, bytesRead); } long endTime = System.currentTimeMillis(); System.out.println("File downloaded"); System.out.println("Download time in sec. is:-" + (endTime - startTime) / 1000); outputStream.close(); inputStream.close(); } catch (IOException ex) { ex.printStackTrace(); } }
第二种方法
通过账号密码登录后进行下载:
public Result<?> download(){ //进行下载文件---------------------------------开始 //远程服务器下载地址 String fileurl = "ftp://192.168.1.8:8888/usr/mp4pt/rec/CHN0/20220420095100/00001.mp4"; //本地文件物理路径 String realfilepath = "F:/rhsftdemo/00001.mp4"; //本地中新建文件夹目录 File file = new File("F:/rhsftdemo/"); if (!file.exists()) { file.mkdirs(); } log.info("存储路径realfilepath:" + realfilepath + "下载路径:" + fileurl); boolean bb = retepasvfile(realfilepath,fileurl,"00001.mp4"); return Result.ok(); } /** * 本地保存 * * @param localurl 本地文件物理路径 * @param hosturl 远程服务器下载地址 * @param filename 文件名称 * * @return */ public synchronized boolean retepasvfile(String localurl, String hosturl, String filename) { FTPClient ftp = new FTPClient(); boolean re = false; try { log.info("本地存储路径==:" + localurl); File file = FileUtil.getFile(localurl); ftp.setConnectTimeout(10000); ftp.setDataTimeout(10000); ftp.connect("192.168.1.8", 21); if (!org.springframework.util.StringUtils.isEmpty("admin") && !org.springframework.util.StringUtils.isEmpty("superAdmin123") && "superAdmin" != "null" && "superAdmin123" != "null") { //这里输入账号密码 ftp.login("superAdmin", "superAdmin123"); } else { log.info("开始链接ftp:"); ftp.login("anonymous", "anonymous"); } //ftp.bin(); // String str=ftp.pwd(); ftp.enterLocalPassiveMode(); //被动模式 ftp.setControlKeepAliveTimeout(60); ftp.setFileType(FTP.BINARY_FILE_TYPE); boolean b = ftp.changeWorkingDirectory(hosturl.substring(0, hosturl.lastIndexOf("/"))); log.info("pwd:" + b + "---切换目录:" + hosturl.substring(0, hosturl.lastIndexOf("/"))); long locationsize = file.length();//服务器上文件的大小 if (b) { boolean res = false; res = ftp.retrieveFile(filename, new FileOutputStream(file)); if (res) { //ftp.disconnect(); log.info("文件下载完成"); re = true; } else { log.info("文件下载失败"); //ftp.disconnect(); } } } catch (Exception e) { e.getStackTrace(); log.error("retepasvfileSamba:e=3" + e); } finally { try { ftp.disconnect(); } catch (Exception e) { } } return re; }
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。