java在业务代码中创建HttpServletRequest和HttpServletResponse

在代码中自己获取一个HttpServletRequest

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

在代码中自己获取一个HttpServletResponse

ServletRequestAttributes requestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
HttpServletResponse resp = requestAttributes.getResponse();
resp.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
resp.setHeader("Access-Control-Allow-Credentials", "true");
resp.setContentType("application/json; charset=utf-8");
resp.setCharacterEncoding("UTF-8");
PrintWriter out = resp.getWriter();
out.flush();
out.close();