tomcat获取域名

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/getDomain")
public class GetDomainServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String scheme = request.getScheme(); // 获取协议（http 或 https）
        String serverName = request.getServerName(); // 获取服务器名称（域名）
        int serverPort = request.getServerPort(); // 获取服务器端口

        String domain = scheme + "://" + serverName;
        if (serverPort != 80 && serverPort != 443) {
            domain += ":" + serverPort;
        }

        response.setContentType("text/plain");
        response.getWriter().write("Request Domain: " + domain);
    }
}