spring mvc 預覽pdf 一直會變成下載問題

Content-disposition中Attachment和inline的區別

Content-disposition Attachment和inline的區別 內嵌顯示 spring download 內聯顯示 

java web中下載文件時,我們一般設置Content-Disposition告訴瀏覽器下載文件的名稱,是否在瀏覽器中內嵌顯示.

Content-disposition: inline; filename=foobar.pdf

表示瀏覽器內嵌顯示一個文件

 

Content-disposition: attachment; filename=foobar.pdf

 

實例：

 /**
     * 合同文件預覽
     * @param id
     * @return
     */
    @ApiOperation(value = "合同文件預覽", produces = "application/pdf")
    @RequestMapping(value = "viewFile",method = RequestMethod.GET,produces="application/pdf")
    public ResponseEntity<byte[]>   viewFile(@ApiParam(value = "合同id") @RequestParam(value = "id") String id) throws Exception {
        ContractFileDTO contractFileDTO = contractFileService.get(id);
        InputStream inputStream = null;
        //數據庫里面存了兩種數據，一種是fileId,一種是fileKey，為了兼容
        if(contractFileDTO.getFileId().length() > 32){
            inputStream = getViewFileInputStreamByKey(contractFileDTO.getFileId());
        }else{
            inputStream = getViewFileInputStream(contractFileDTO.getFileId());
        }

        //http頭信息
        HttpHeaders headers = new HttpHeaders();
        //設置編碼
        String downloadFileName = new String(contractFileDTO.getFileName().getBytes("UTF-8"),"UTF-8");

        headers.setContentDispositionFormData("inline;",downloadFileName.trim()+".pdf");


//        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

        return new ResponseEntity<byte[]>( IOUtils.toByteArray(inputStream),headers,org.springframework.http.HttpStatus.CREATED);
    }