java requset 获取http和https

Java中可以使用HttpURLConnection类来获取HTTP和HTTPS请求。以下是一个简单的示例：

import java.net.HttpURLConnection;
import java.net.URL;

public class HttpTest {
    public static void main(String[] args) {
        try {
            // HTTP请求
            URL url = new URL("http://www.example.com");
            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
            httpConnection.setRequestMethod("GET");
            int responseCode = httpConnection.getResponseCode();
            System.out.println("HTTP Response Code: " + responseCode);

            // HTTPS请求
            url = new URL("https://www.example.com");
            httpConnection = (HttpURLConnection) url.openConnection();
            httpConnection.setRequestMethod("GET");
            responseCode = httpConnection.getResponseCode();
            System.out.println("HTTPS Response Code: " + responseCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在上面的示例中，我们使用`HttpURLConnection`类来打开一个URL连接，并向服务器发送HTTP和HTTPS请求。在每个请求中，我们设置请求方法为“GET”，并获取服务器的响应代码。请注意，HTTPS请求需要使用受信任的证书进行身份验证。如果证书无效或过期，将会抛出异常。