Package javax.servlet

Interface RequestDispatcher

    • Method Detail

      • forward

        void forward​(ServletRequest request,
                     ServletResponse response)
              throws ServletException,
                     java.io.IOException
        Forwards a request from a servlet to another resource (servlet, JSP file, or HTML file) on the server. This method allows one servlet to do preliminary processing of a request and another resource to generate the response.

        For a RequestDispatcher obtained via getRequestDispatcher(), the ServletRequest object has its path elements and parameters adjusted to match the path of the target resource.

        forward should be called before the response has been committed to the client (before response body output has been flushed). If the response already has been committed, this method throws an IllegalStateException. Uncommitted output in the response buffer is automatically cleared before the forward.

        The request and response parameters must be the same objects as were passed to the calling servlet's service method.

        Parameters:
        request - a ServletRequest object that represents the request the client makes of the servlet
        response - a ServletResponse object that represents the response the servlet returns to the client
        Throws:
        ServletException - if the target resource throws this exception
        java.io.IOException - if the target resource throws this exception
        java.lang.IllegalStateException - if the response was already committed
      • include

        void include​(ServletRequest request,
                     ServletResponse response)
              throws ServletException,
                     java.io.IOException
        Includes the content of a resource (servlet, JSP page, HTML file) in the response. In essence, this method enables programmatic server-side includes.

        The ServletResponse object has its path elements and parameters remain unchanged from the caller's. The included servlet cannot change the response status code or set headers; any attempt to make a change is ignored.

        The request and response parameters must be the same objects as were passed to the calling servlet's service method.

        Parameters:
        request - a ServletRequest object that contains the client's request
        response - a ServletResponse object that contains the servlet's response
        Throws:
        ServletException - if the included resource throws this exception
        java.io.IOException - if the included resource throws this exception