如何知道何时在RequestWrapper对象中转发请求

原始请求URI可以作为带有key的请求属性

RequestDispatcher.FORWARD_REQUEST_URI

String originalRequestURI = request.getAttribute(RequestDispatcher.FORWARD_REQUEST_URI);if (originalRequestURI != null) {    // It was forwarded. Now get the query string as follows.    String originalQueryString = request.getAttribute(RequestDispatcher.FORWARD_QUERY_STRING);}

注意：在较早的Servlet
API版本中，您需要对密钥进行硬编码。

String originalRequestURI = request.getAttribute("javax.servlet.forward.request_uri");// ...