如何在java中发送带有响应的pdf文件

Question

我的项目目录中有一个pdf文件，我必须获取该pdf文件并将其作为响应发送并在前端（UI）中显示

所以我尝试了以下代码：

@GetMapping(value = "/getDocument/{id}")
public HttpServletResponse 
getDocumentByAssocLeadDocId(@PathVariable("id") int id
        ,HttpServletRequest request,HttpServletResponse 
response) {
    List<LeadDetailsDTO> leadList = null;

    ResponseEntity<Map<String, Object>> responseEntity = null;
    try { 
        String path = leadService.getDocumentByAssocLeadDocId(id); 
         File file=new File(path); 
         PDDocument pdf = PDDocument.load(file);

         ServletOutputStream outStream = response.getOutputStream();
         //outStream.write(b);
        }
     catch (Exception e) {

        e.printStackTrace();
    }
    return response;
}

我如何发送带有响应的信息，并且单击查看按钮时想在新标签中显示pdf？

如果至少没有下载，请帮助我。谢谢。