请帮我写一个java工具类，内容是支持HTTP以及HTTPS调用的工具类

好的，以下是一个简单的 Java 工具类，支持 HTTP 和 HTTPS 调用：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class HttpUtils {

    // HTTP GET 请求
    public static String sendGet(String urlString) {
        String result = "";
        try {
            URL url = new URL(urlString);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0");
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = reader.readLine()) != null) {
                result += line;
            }
            reader.close();
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    // HTTPS GET 请求
    public static String sendHttpsGet(String urlString) {
        String result = "";
        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[] { new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }
                public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }
            } }, new java.security.SecureRandom());
            URL url = new URL(urlString);
            HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setRequestMethod("GET");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0");
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = reader.readLine()) != null) {
                result += line;
            }
            reader.close();
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

使用时，可以通过以下方式调用：

String httpResult = HttpUtils.sendGet("http://www.example.com");
String httpsResult = HttpUtils.sendHttpsGet("https://www.example.com");

需要注意的是，HTTPS 请求需要进行 SSL 验证，上述代码中省略了证书验证，不建议在生产环境中使用。如果需要进行证书验证，请参考 Java 官方文档中的示例代码：[Java HTTPS Client Example](https://docs.oracle.com/javase/tutorial/security/apisign/step3.html)。