To solve the garbage problem response

As stated, the reason I'm having the above-mentioned problems are:

        Coding should be set in the acquisition   PrintWriter before

                        resp.setCharacterEncoding("utf-8");
                        resp.setContentType("application/json;charset=utf-8");

                        PrintWriter out = resp.getWriter();
                        // HTTP 错误 401.1 - 未经授权：访问由于凭据无效被拒绝。
                        resp.setStatus(401);