一个简单的文件从一台电脑到另外一台电脑的demo

 public static void main(String[] args) {

            if(args.length<2){
                LOGGER.info("启动参数缺失");
                System.out.println("启动参数缺失");
            }
            String sourceBaseUrl = args[0];
            String remoteBaseUrl = args[1];

            try {
                WatchKey watchKey;
                // 监听文件夹下文件的新增
                WatchService watchService = FileSystems.getDefault().newWatchService();
                Paths.get(sourceBaseUrl).register(watchService, StandardWatchEventKinds.ENTRY_CREATE);
                while (true) {
                    LOGGER.debug("等待文件加载...");
                    watchKey = watchService.take();//没有文件增加时，阻塞在这里
                    for (WatchEvent<?> event : watchKey.pollEvents()) {
                        String fileName = sourceBaseUrl + "\\" + event.context();
                        Path path = Paths.get(fileName);
                        File uploadFile = path.toFile();
                        uploadFile(uploadFile,remoteBaseUrl);//上传服务器
                        Files.deleteIfExists(path);
                    }
                    if (!watchKey.reset()) {
                        break; //中断循环
                    }
                }
            } catch (IOException | InterruptedException e) {
                e.printStackTrace();
            }
        }

        private static void uploadFile(File uploadFile,String url) {
            MultipartPostMethod postMethod = new MultipartPostMethod(url);
        try {
            postMethod.addParameter("file",uploadFile);
            postMethod.addParameter("fileName",uploadFile.getName());
            HttpClient client = new HttpClient();
            // 由于要上传的文件可能比较大 , 因此在此设置最大的连接超时时间
           client.setConnectionTimeout(50000);
            int status = client.executeMethod(postMethod);
            if (status == HttpStatus.SC_OK) {
                LOGGER.debug("上传成功");
            } else {
                LOGGER.error("上传失败");
            }
        } catch (Exception e) {
            LOGGER.error("上传失败,原因：{}",e);
        } finally {
            // 释放连接
            postMethod.releaseConnection();
        }
    }

@SpringBootApplication
@RestController
@Log4j2
public class FileStoreApplication {

    private static String fileLocation;

    public static void main(String[] args) {
        if (args.length < 1) {
            log.error("请输入文件存放路径");
            return;
        }
        fileLocation = args[0];
        SpringApplication.run(FileStoreApplication.class, args);
    }

    @PostMapping("")
    public HttpServletResponse upload(@RequestParam("file") MultipartFile file,
                                      @RequestParam("fileName")String fileName,
                                      HttpServletResponse response) throws IOException {
        if (StringUtils.isBlank(fileLocation)) {
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return response;
        }
        // io 写入
        Path path = Paths.get(fileLocation,fileName);
        Files.write(path, file.getBytes(), StandardOpenOption.CREATE);
        log.info("上传成功");
        return response;
    }

}