从Android向带有json对象数据和头部的URL发送Post请求

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

public class MainActivity extends AppCompatActivity {

    private static final String URL = "http://example.com/api"; // 替换为你的URL

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 创建JSON对象
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("key1", "value1");
            jsonObject.put("key2", "value2");
        } catch (JSONException e) {
            e.printStackTrace();
        }

        // 发送POST请求
        sendPostRequest(jsonObject);
    }

    private void sendPostRequest(JSONObject jsonObject) {
        try {
            // 创建URL对象
            URL url = new URL(URL);

            // 创建HttpURLConnection对象
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

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

            // 设置请求头部
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Accept", "application/json");

            // 启用输出流，用于发送数据
            connection.setDoOutput(true);

            // 获取输出流
            DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());

            // 将JSON对象转换为字符串
            String jsonInputString = jsonObject.toString();

            // 将数据写入输出流
            outputStream.writeBytes(jsonInputString);
            outputStream.flush();
            outputStream.close();

            // 获取响应码
            int responseCode = connection.getResponseCode();

            // 读取响应内容
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();

            // 处理响应结果
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 请求成功
                String responseData = response.toString();
                // 处理响应数据
            } else {
                // 请求失败
            }

            // 断开连接
            connection.disconnect();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}