Как отправить post запрос в java приложение из формы, полученной с get запроса?

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import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class PostRequestExample {

    public static void main(String[] args) {
        try {
            String url = "http://example.com/api/post-data";
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            // Set request method to POST
            con.setRequestMethod("POST");

            // Set request headers
            con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            // Set request parameters
            Map params = new HashMap<>();
            params.put("param1", "value1");
            params.put("param2", "value2");
            params.put("param3", "value3");

            // Convert request parameters to POST string
            String postData = "";
            for (Map.Entry entry : params.entrySet()) {
                if (!postData.isEmpty()) {
                    postData += "&";
                }
                postData += entry.getKey() + "=" + entry.getValue();
            }

            // Send POST request
            con.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream(con.getOutputStream());
            wr.writeBytes(postData);
            wr.flush();
            wr.close();

            // Read response from the server
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String response = "";
            String line;
            while ((line = in.readLine()) != null) {
                response += line;
            }
            in.close();

            // Print response
            System.out.println(response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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

public class GetRequestExample {

    public static void main(String[] args) {
        try {
            String url = "http://example.com/api/get-data";
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            // Set request method to GET
            con.setRequestMethod("GET");

            // Send GET request
            con.setDoOutput(true);
            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String response = "";
            String line;
            while ((line = in.readLine()) != null) {
                response += line;
            }
            in.close();

            // Print response
            System.out.println(response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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import java.net.URL;
import java.util.Map;
import java.util.HashMap;

public class GetParamsExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://example.com/api/get-data?param1=value1&param2=value2");

            String query = url.getQuery();
            Map<String, String> params = new HashMap<>();
            for (String param : query.split("&")) {
                String[] pair = param.split("=");
                String key = pair[0];
                String value = pair.length > 1 ? pair[1] : "";
                params.put(key, value);
            }

            // Now you have the parameters from the GET request
            // You can use them to build your POST request
            System.out.println(params);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}