Java：原生javaWeb下载pdf文件

鉴于网上许多下载pdf的代码下载的pdf都是无效pdf，我稍加修改：

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@RequestMapping("/downPdf") public void downPdf(HttpServletResponse response, HttpServletRequest request){     String pdfPath = "C:\\Users\\17921\\Desktop\\spring-boot-reference.pdf";     File file = new File(pdfPath);     String pdfName = FilenameUtils.getName(pdfPath);     OutputStream os = null;     try{         FileInputStream in = new FileInputStream(file);         BufferedInputStream bf = new BufferedInputStream(in);         os = response.getOutputStream();         response.setContentType(MediaType.APPLICATION_PDF_VALUE);         response.setHeader("content-Disposition","attachment;filename="+pdfName);         byte[] b = new byte[bf.available() + 1000];         int i;         while((i=bf.read(b))!=-1){             os.write(b,0,i);         }         os.flush();     }catch(IOException ignored){       }finally {         try {             if (os != null) {                 os.close();             }         } catch (IOException e) {             e.printStackTrace();         }     } }