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