http请求报错401 这个怎么解决

Question

import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.net.UnknownHostException; public class GetToken {     public static final String POST_URL = "https://c2bt4.maxuscloud.com/oauth/token";     /**      * 调用Post接口      */     public static void httpURLConnectionPOST(){         try {             URL url = new URL(POST_URL);             HttpURLConnection connection = (HttpURLConnection) url.openConnection();             connection.setDoOutput(true);             connection.setDoInput(true);             connection.setRequestMethod("POST");             // post请求缓存设为false             connection.setUseCaches(false);             // 设置该HttpURLConnection实例是否自动执行重定向             connection.setInstanceFollowRedirects(true);             connection.setRequestProperty("Content-Type","application/json;charset=utf-8");             connection.connect();             DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());             String param = "client_id=bc8f844701de11e98372fa163ed907b0&client_secret=cda0673501de11e98372fa163ed907b0&scope=read write&grant_type=client_credentials";             dataout.writeBytes(param);             dataout.flush();             dataout.close();             BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));             String line;             StringBuilder sb = new StringBuilder(); // 用来存储响应数据             // 循环读取流,若不到结尾处             while ((line = bf.readLine()) != null) {                 //sb.append(bf.readLine());                 sb.append(line).append(System.getProperty("line.separator"));             }             bf.close();    // 重要且易忽略步骤 (关闭流,切记!)             connection.disconnect(); // 销毁连接             System.out.println(sb.toString());         }catch (Exception e){             e.printStackTrace();         }     }

Answer 1

未授权，服务器没有配置好