HttpServletRequest-优快云博客

本文详细解析了如何从HttpServletRequest中获取并构造完整的URL，包括scheme、serverName、serverPort、contextPath、servletPath、pathInfo和queryString等组件。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

// http://hostname.com/mywebapp/servlet/MyServlet/a/b;c=123?d=789

public static String getUrl(HttpServletRequest req) {
  String reqUrl = req.getRequestURL().toString();
  String queryString = req.getQueryString();  // d=789
  if (queryString != null) {
    reqUrl += "?"+queryString;
  }
  return reqUrl;
}

public static String getURL(HttpServletRequest req) {

  String scheme = req.getScheme();       // http
  String serverName = req.getServerName();   // hostname.com
  int serverPort = req.getServerPort();    // 80
  String contextPath = req.getContextPath();  // /mywebapp
  String servletPath = req.getServletPath();  // /servlet/MyServlet
  String pathInfo = req.getPathInfo();     // /a/b;c=123
  String queryString = req.getQueryString();     // d=789

  // Reconstruct original requesting URL
  StringBuffer url = new StringBuffer();
  url.append(scheme).append("://").append(serverName);

  if (serverPort != 80) {
    url.append(":").append(serverPort);
  }

  url.append(contextPath).append(servletPath);

  if (pathInfo != null) {
    url.append(pathInfo);
  }
  if (queryString != null) {
    url.append("?").append(queryString);
  }
  return url.toString();
}