springboot以FTP方式上传文件到远程服务器

 <div class="layui-form-item">
            <label class="layui-form-label">上传附件：</label>
            <div class="layui-input-block doc-litpic">
              <button type="button" name="avatar" class="layui-btn layui-btn-sm" data-url="/admin/archives/upload.html" id="larry-litpic"><i class="layui-icon"></i>本地上传</button>
              <a id="upload-filename-display" style="color: blue" href=""></a>
              <div class="larryms-img-view">
              </div>
            </div>
          </div>

 upload.render({
      accept: 'file',
      elem: '#larry-litpic',
      url: interface_cms_article_upload,
      field: 'fileNames',
      done : function (res, index, upload) {
        if(res.code != 200){
          layer.open({
            icon : 2,
            skin : "layui-layer-molv",
            content : res.msg
          });
        }else{
          layer.open({
            icon : 1,
            skin : "layui-layer-molv",
            content : res.msg
          });
          $('#upload-filename-display').text(res.filename);
          $("input[name='fileId']").val(res.filename);
        }
      },
      error : function (res) {
      }
    });

@RequestMapping(value = "/upload")
  @ApiOperation(value = "本地文件上传",notes ="本地文件上传" )
  public Map uploadfunction(HttpServletRequest request, HttpServletResponse response){
    //创建文件对象并获取请求中的文件对象
    MultipartFile file = null;
    Map resultData = new HashMap();
    try{
      MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
      file = mRequest.getFile("fileNames");
      //判断上传非空
      if(null == file) {
        resultData.put("code",0);
        resultData.put("msg","上传文件失败");
        resultData.put("filename",file.getOriginalFilename());
        return resultData;
      }
      //上传需要导入数据的文件
      //用来检测程序运行时间
      long startTime=System.currentTimeMillis();
      System.out.println("上传的文件名为："+file.getOriginalFilename());
      String fileName = file.getOriginalFilename();
      InputStream inputStream = file.getInputStream();
      String hostName = uploadUtil.getHostname();
      String username = uploadUtil.getUsername();
      String password = uploadUtil.getPassword();
      String targetPath = uploadUtil.getTargetPath();
      String suffix = cmsArticleService.getSuffix(fileName);
      fileName = cmsArticleService.upload(hostName,username,password,targetPath,suffix,inputStream);
      //计算上传时间
      long endTime=System.currentTimeMillis();
      String uploadTime = String.valueOf(endTime-startTime);
      System.out.println("上传所用时间："+uploadTime+"ms");
      resultData.put("code",200);
      resultData.put("msg","上传文件成功");
      resultData.put("filename",fileName);
      return resultData;
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return null;
  }

//FTP文件上传
  public static String upload(String hostname,String username,String password,
                String targetPath,String suffix,InputStream inputStream) throws SocketException, IOException {
    //实例化ftpClient
    FTPClient ftpClient = new FTPClient();
    //设置登陆超时时间,默认是20s
    ftpClient.setDataTimeout(12000);
    //1.连接服务器
    ftpClient.connect(hostname,21);
    //2.登录（指定用户名和密码）
    boolean b = ftpClient.login(username,password);
    if(!b) {
      System.out.println("登陸超時");
      if (ftpClient.isConnected()) {
        // 断开连接
        ftpClient.disconnect();
      }
    }
    // 设置字符编码
    ftpClient.setControlEncoding("UTF-8");
    //基本路径，一定存在
    String basePath="/";
    String[] pathArray = targetPath.split("/");
    for(String path:pathArray){
      basePath+=path+"/";
      //3.指定目录 返回布尔类型 true表示该目录存在
      boolean dirExsists = ftpClient.changeWorkingDirectory(basePath);
      //4.如果指定的目录不存在，则创建目录
      if(!dirExsists){
        //此方式，每次，只能创建一级目录
        boolean flag=ftpClient.makeDirectory(basePath);
        if (flag){
        System.out.println("创建成功！");
        }
      }
    }
    //重新指定上传文件的路径
    ftpClient.changeWorkingDirectory(targetPath);
    //5.设置上传文件的方式
    ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
    //使用uuid，保存文件名唯一性
    String uuid= UUID.randomUUID().toString();
    /**
     * 6.执行上传
     * remote 上传服务后，文件的名称
     * local 文件输入流
     * 上传文件时，如果已经存在同名文件，会被覆盖
     */
    boolean uploadFlag = ftpClient.storeFile(uuid+suffix,inputStream);
    if(uploadFlag)
      System.out.println("上传成功！");
    return uuid+suffix;
  }

@Data
@Component
public class UploadUtil {
  @Value("${upload.hostname}")
  private String hostname;
  @Value("${upload.username}")
  private String username;
  @Value("${upload.password}")
  private String password;
  @Value("${upload.targetPath}")
  private String targetPath;
}