过滤器输出返回值

    private void returnJson(HttpServletRequest request,ServletResponse response, ResultModel ResultModel) throws IOException {
        //把返回值输出到客户端
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        response.setContentType("application/json; charset=utf-8");
        response.setCharacterEncoding("UTF-8");
        ServletOutputStream outputStream = response.getOutputStream();
        outputStream.write(JsonTools.objToJson(ResultModel).getBytes());
        outputStream.flush();
        outputStream.close();

    }