手机app+连接云服务器异常

import android.os.AsyncTask;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class NetworkTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {
        try {
            URL url = new URL(params[0]);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 处理成功响应
                return "Success";
            } else {
                // 处理错误响应
                return "Error: " + responseCode;
            }
        } catch (IOException e) {
            e.printStackTrace();
            return "Exception: " + e.getMessage();
        }
    }

    @Override
    protected void onPostExecute(String result) {
        // 更新UI显示结果
        System.out.println(result);
    }
}