java 调用远程https

在Java中，通过HTTP或HTTPS协议调用远程服务通常使用的是`java.net`包下的API，特别是`HttpURLConnection`或者更现代的`HttpClient`（从Java 7开始推荐使用`org.apache.httpcomponents.client5`库）。这里是一个简单的例子，展示如何使用`HttpURLConnection`发送GET请求到HTTPS服务器：

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

public class Main {
    public static void main(String[] args) throws Exception {
        URL url = new URL("https://example.com/api/data");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        
        // 设置连接为HTTPS并验证证书
        connection.setDoOutput(true);
        connection.setRequestMethod("GET");
        connection.setRequestProperty("User-Agent", "Mozilla/5.0");
        connection.connect();

        int responseCode = connection.getResponseCode();
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        // 打印响应数据
        System.out.println(response.toString());

        // 关闭连接
        connection.disconnect();
    }
}

如果你需要处理更复杂的请求或支持其他HTTP方法，可以考虑使用第三方库如Apache HttpClient、OkHttp等。