如何从Android应用程序向网页发出请求

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

public class MainActivity extends AppCompatActivity {
    
    private static final String TARGET_URL = "http://www.example.com";
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    // 创建URL对象
                    URL url = new URL(TARGET_URL);

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

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

                    // 发送请求并获取服务器的响应
                    InputStream inputStream = connection.getInputStream();

                    // 处理服务器响应
                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        response.append(line);
                    }
                    reader.close();

                    // 在主线程中更新UI
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            // 处理服务器响应，例如显示在TextView中
                            textView.setText(response.toString());
                        }
                    });
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}