http 上传文件

@RequestMapping(method=RequestMethod.POST,value = "/upload")   

    public ModelAndView processImageUpload(@RequestParam(value="groupname",required=false) String group,

            @RequestParam(value="remotefilename",required=false) String remotefilename,

            @RequestParam(value="extname",required=true) String extname,

            @RequestParam("file") MultipartFile file ,@RequestParam(value="format",required=false) String format   // 关键就是这句话起了作用

                ){

        Response<FastDFSFile> response  = new Response<FastDFSFile>();

        ReturnResult<FastDFSFile> returnResult = new ReturnResult<FastDFSFile>();

        ResponseHeader responseHeader = new ResponseHeader();

        boolean appendFlag = false;

        String[] results = null;

        try {

            if (!file.isEmpty()) {

                if(group != null && !group.equals("") && remotefilename != null && !remotefilename.equals("")){

                    results = new String[2];

                    results[0] = group;

                    results[1] = remotefilename;

                    appendFlag = true;

                }else

                    appendFlag = false;

                byte[] file_buff = file.getBytes();

                

                String[] fDinfo = FastDFS.getServer().upload(appendFlag, results, file_buff, extname);

                if(fDinfo.length == 2){

                    List<FastDFSFile> fileList = new ArrayList<FastDFSFile>();

                    FastDFSFile info = new FastDFSFile();

                    info.setGroupname(fDinfo[0]);

                    info.setRemotefilename(fDinfo[1]);

                    fileList.add(info);

                    responseHeader.setStatus(0);

                    returnResult.setNumFound(1);

                    returnResult.setStart(1);

                    returnResult.setFilelist(fileList);

                }else if(fDinfo.length == 1){

                    throw new UFEException(fDinfo[0]);

                }else{

                    throw new UFEException("no return fastDFS!");

                }

              }else{

                  RError er = new RError();

                  er.setInfo("No file!");

                  er.setType(1);

                  responseHeader.setError(er);

                  responseHeader.setStatus(1);

              }

        } catch (Exception e1) {

            RError er = new RError();

            if(e1.getCause() == null)

                er.setInfo(e1.getMessage());

            else

                er.setInfo(e1.getCause().getMessage());

            er.setType(1);

            responseHeader.setStatus(1);

            responseHeader.setError(er);

        }

        response.setResult(returnResult);

        response.setResponseHeader(responseHeader);

        if(format != null && format.equals("json")) 

            return new ModelAndView(TypeDef.JSON_VIEW_NAME, "object", response);

        else 

            return new ModelAndView(TypeDef.XML_VIEW_NAME, "object", response);

    }