import javax.net.ssl.HttpsURLConnection;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

public class HttpsClient {
    public static void main(String[] args) throws Exception {
        URL url = new URL("https://www.example.com");
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

        // Проверка сертификата
        conn.setSSLSocketFactory((SSLSocketFactory) SSLSocketFactory.getDefault());
        conn.setRequestMethod("GET");

        // Чтение ответа
        BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println(inputLine);
        }
        in.close();
    }
}

import javax.net.ssl.*;
import java.io.FileInputStream;
import java.security.KeyStore;

public class CustomSSLContext {
    public static void main(String[] args) throws Exception {
        String keystorePath = "keystore.jks"; // Файл хранилища ключей
        String keystorePassword = "password";

        // Загрузка ключей
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
        keyStore.load(new FileInputStream(keystorePath), keystorePassword.toCharArray());

        // Инициализация KeyManagerFactory
        KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        keyManagerFactory.init(keyStore, keystorePassword.toCharArray());

        // Создание SSL-контекста
        SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(keyManagerFactory.getKeyManagers(), null, null);

        // Использование SSLContext
        SSLSocketFactory socketFactory = sslContext.getSocketFactory();
        HttpsURLConnection.setDefaultSSLSocketFactory(socketFactory);
    }
}