java实现HTTP Basic认证

public static String doGet(String urlStr){
        try{
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            
            String authString = "admin:public";
            byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
            String authStringEnc = new String(authEncBytes);
            conn.setRequestProperty("Authorization", "Basic " + authStringEnc);　　//设置Authoriization字段

            conn.connect();
            
            int status = conn.getResponseCode();
            
            System.out.println(status);
            
            if(status == 200){
                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String str = "";
                StringBuffer sb = new StringBuffer();
                while((str=reader.readLine()) != null){
                    sb.append(str);
                }
                return sb.toString();
            }
            System.out.println("请求emq服务失败");
        }catch(Exception e){
            e.printStackTrace();
        }
        return "error";
    }