ajax query，后台和Jsp页面，使用json交互

加粗样式

public void checkAccount(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String account = request.getParameter("account");
        Staff staff = staffService.getByAccount(account);
        JSONObject jsonObject = null;
        if (null != staff){
            //数据库已存在该账号，则返回信息给ajax
            jsonObject = new JSONObject("{accountFlag:true}");
        }else {
            //数据库未存在该账号
            jsonObject = new JSONObject("{accountFlag:false}");
        }
        response.getOutputStream().write(jsonObject.toString().getBytes("utf-8"));
    }
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