Android上的HTTP POST

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 HttpClientExample {
    public static void main(String[] args) throws IOException {
        String url = "http://example.com/api";
        String requestBody = "{\"key\": \"value\"}";

        URLConnection connection = new URL(url).openConnection();
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/json");

        try (OutputStream os = connection.getOutputStream()) {
            os.write(requestBody.getBytes());
        }

        try (BufferedReader br = new BufferedReader(
                new InputStreamReader(connection.getInputStream()))) {

            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }

        }
        connection.disconnect();
    }
}