当Java出现401未授权错误时，如何捕获POST请求的json响应？

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("http://example.com/api/endpoint");

            // 打开连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求方法为POST
            connection.setRequestMethod("POST");

            // 设置请求头部信息，包括认证信息
            connection.setRequestProperty("Authorization", "Bearer your_token");

            // 获取响应状态码
            int responseCode = connection.getResponseCode();

            // 检查状态码
            if (responseCode == HttpURLConnection.HTTP_UNAUTHORIZED) {
                // 未授权错误处理逻辑
                // 读取响应体
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                reader.close();

                // 解析JSON响应
                // 使用JSON解析库解析JSON数据
                // ...

                // 处理JSON数据
                // ...
            } else {
                // 其他状态码处理逻辑
                // ...
            }

            // 关闭连接
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}