http返回写入问题

1.服务器返回写的数据全是通过response对象，response.getWriter().print(msg);这样就返回写出数据了。

比如：

logger.info("encrypted: " + md5Encrypted);
            if(!md5Encrypted.equalsIgnoreCase(param.getSign())){
                logger.info("sign invalid");
                this.response(response, JSONObject.toJSONString(new ResultObject(ResultCode.SIGN_INVALID)));
                return;
            }else{
                logger.info("valid sign success");
            }
            
        }else{
            this.response(response, JSONObject.toJSONString(new ResultObject(ResultCode.NULL_PARAM)));
            return;
        }
        
        //签名验证成功
        chain.doFilter(requestWrapper, response);
    }

    private void response(ServletResponse response, String msg) throws IOException{
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8;");
        response.getWriter().print(msg);
        response.flushBuffer();
    }