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java如何使用ftp下载远程服务器文件

目录
  • Java使用ftp下载远程服务器文件
    • 第一种方法
    • 第二种方法
  • 总结

    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 filesi编程客栈ze = 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:/rhsftdemoandroid/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"编程客栈, "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
            php    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(www.devze.com"/")));
                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编程客栈(www.devze.com)。

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