@RequestMapping("/getPaperNumber")
//调用HttpServletResponse
public void getPaperNumber(HttpServletResponse response) {
int papers = paperService.getPaperNumber();
String pageNumber= JSON.toJSONString(papers);
try {
//response.getWriter().print:传递参数
//pageNumber:需要传递的参数
response.getWriter().print(pageNumber);
}catch (Exception e){
e.printStackTrace();
}
}