springMVC4.0圖片顯示與檔案下載
阿新 • • 發佈:2019-02-15
客戶端與手機端公用,圖片返回流
是否是圖片@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("資源不存在%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(); } } }
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; } }