如何从android应用程序向网站发送json数据

import android.os.AsyncTask;
import android.util.Log;

import org.json.JSONException;
import org.json.JSONObject;

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

public class SendJsonDataTask extends AsyncTask<Void, Void, String> {

    private static final String TAG = "SendJsonDataTask";

    @Override
    protected String doInBackground(Void... voids) {
        String response = null;

        try {
            // 构建JSON数据
            JSONObject jsonData = new JSONObject();
            jsonData.put("key1", "value1");
            jsonData.put("key2", "value2");

            // 创建HTTP请求
            URL url = new URL("http://example.com/api");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setDoOutput(true);

            // 添加JSON数据到请求体
            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(jsonData.toString().getBytes());
            outputStream.flush();
            outputStream.close();

            // 发送请求并获取响应
            int statusCode = connection.getResponseCode();
            if (statusCode == HttpURLConnection.HTTP_OK) {
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                StringBuilder stringBuilder = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    stringBuilder.append(line);
                }
                reader.close();
                response = stringBuilder.toString();
            } else {
                Log.e(TAG, "HTTP request failed with status code: " + statusCode);
            }

            connection.disconnect();
        } catch (IOException | JSONException e) {
            Log.e(TAG, "Error sending JSON data: " + e.getMessage());
        }

        return response;
    }

    @Override
    protected void onPostExecute(String response) {
        // 解析服务器响应
        if (response != null) {
            try {
                JSONObject jsonResponse = new JSONObject(response);
                // 处理服务器响应的JSON数据
            } catch (JSONException e) {
                Log.e(TAG, "Error parsing JSON response: " + e.getMessage());
            }
        }
    }
}