springMVC4.0图片显示与文件下载

梦里梦外; 2022-08-10 04:58 157阅读 0赞

客户端与手机端公用，图片返回流

@RequestMapping(value = "/download")
        @ResponseBody
        public void download(
                String id,String type,@RequestParam(value = DEFAULT_JQUERY_JSONP_CALLBACK_PARAM_NAME, required = false) String callbackName,
                HttpServletResponse response) throws IOException {
            if (StringUtils.isNotEmpty(id) && StringUtils.isNotEmpty(type)) {
                HttpHeaders headers = new HttpHeaders();
                File file = null;
                if ("real".equals(type)) {
                    com.miracle.mby.core.entity.File fileModel = fileService.getFilesByMd5(id);
                    if (null != fileModel) {
                        Dict dict = fileService.getUploadFileDict();
                        headers.setContentDispositionFormData("attachment", new String(fileModel.getOrginName().getBytes("UTF-8"), "ISO8859-1"));
                        file = new File(dict.getValue() + fileModel.getPath());
    
                    }
                } else if ("temp".equals(type)) {
                    file = FileUtils.getTempUploadFile(id);
                    if (file == null) {
                        logger.warn("资源不存在%s", id);
                    } else {
                        headers.setContentDispositionFormData("attachment", new String(file.getName().getBytes("gbk"), "ISO8859-1"));
                    }
                }
                if (FileUtils.isImage(file)) {
                    response.setHeader("Accept-Ranges", "bytes");
                    response.setHeader("Pragma", "no-cache");
                    response.setHeader("Cache-Control", "no-cache");
                    response.setDateHeader("Expires", 0);
    
                }else{
                    response.setContentType("application/octet-stream");
                    response.setHeader("Accept-Ranges", "bytes");
                    response.setHeader("Content-Disposition", "attachment;fileName=" + new String(file.getName().getBytes("gbk"), "ISO8859-1"));
    
                }
                if(file.exists()){
                    FileInputStream inputStream = new FileInputStream(file);
                    response.setHeader("Content-Length", String.valueOf(file.length()));
                    byte[] bos = IOUtils.read(inputStream);
                    OutputStream out = null;
                    out = response.getOutputStream();
                    out.write(bos);
                    out.flush();
                    out.close();
                    inputStream.close();
                }
    
            }
        }

是否是图片

public static boolean isImage(File file){
            if(file.isDirectory()){
                return false;
            }
            String fileName = file.getName();
            int len = fileName.indexOf(".");
            String imagesPattern  = fileName.substring(len+1,fileName.length()).toLowerCase();
            if("jpg".equals(imagesPattern)){
                return true;
            }else if("bmp".equals(imagesPattern)){
                return true;
            }else if("gif".equals(imagesPattern)){
                return true;
            }else if("psd".equals(imagesPattern)){
                return true;
            }else if("pcx".equals(imagesPattern)){
                return true;
            }else if("png".equals(imagesPattern)){
                return true;
            }else if("dxf".equals(imagesPattern)){
                return true;
            }else if("cdr".equals(imagesPattern)){
                return true;
            }else if("ico".equals(imagesPattern)){
                return true;
            }else if("bmp".equals(imagesPattern)){
                return true;
            }else if("jpeg".equals(imagesPattern)){
                return true;
            }else if("svg".equals(imagesPattern)){
                return true;
            }else if("wmf".equals(imagesPattern)){
                return true;
            }else if("emf".equals(imagesPattern)){
                return true;
            }else if("eps".equals(imagesPattern)){
                return true;
            }else if("tga".equals(imagesPattern)){
                return true;
            }else if("nef".equals(imagesPattern)){
                return true;
            }else if("tif".equals(imagesPattern)){
                return true;
            }else if("tiff".equals(imagesPattern)){
                return true;
            }else{
                return false;
            }
    
        }