spring mvc 预览pdf 一直会变成下载问题

Content-disposition中Attachment和inline的区别

Content-disposition Attachment和inline的区别 内嵌显示 spring download 内联显示 

java web中下载文件时,我们一般设置Content-Disposition告诉浏览器下载文件的名称,是否在浏览器中内嵌显示.

Content-disposition: inline; filename=foobar.pdf

表示浏览器内嵌显示一个文件

Content-disposition: attachment; filename=foobar.pdf

实例：

 /**
     * 合同文件预览
     * @param id
     * @return
     */
    @ApiOperation(value = "合同文件预览", 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;
        //数据库里面存了两种数据，一种是fileId,一种是fileKey，为了兼容
        if(contractFileDTO.getFileId().length() > 32){
            inputStream = getViewFileInputStreamByKey(contractFileDTO.getFileId());
        }else{
            inputStream = getViewFileInputStream(contractFileDTO.getFileId());
        }

        //http头信息
        HttpHeaders headers = new HttpHeaders();
        //设置编码
        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);
    }