Java 获取原始请求域名实现示例

import javax.servlet.http.HttpServletRequest;
public class DomainUtil {
    public static String getOriginalDomain(HttpServletRequest request) {
        String originalDomain = request.getHeader("Host");
        if (originalDomain != null) {
            // 解析出原始域名
            int index = originalDomain.indexOf(":");
            if (index != -1) {
                originalDomain = originalDomain.substring(0, index);
            }
        }
        return originalDomain;
    }
}

import java.net.URL;
public class DomainUtil {
    public static String getOriginalDomain(String urlString) {
        String originalDomain = null;
        try {
            URL url = new URL(urlString);
            originalDomain = url.getHost();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return originalDomain;
    }
}

import javax.servlet.http.HttpServletRequest;
public class Main {
    public static void main(String[] args) {
        // 方法一示例
        HttpServletRequest request = null; // 获取HttpServletRequest对象
        String originalDomain = DomainUtil.getOriginalDomain(request);
        System.out.println("原始请求域名：" + originalDomain);
        // 方法二示例
        String urlString = "
        originalDomain = DomainUtil.getOriginalDomain(urlString);
        System.out.println("原始请求域名：" + originalDomain);
    }
}