在servlet2.jsp中:

In servlet2.jsp:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<jsp:include page="/servlet1" />

在servlet2.jsp中，您使用了jsp:include. 它包括servlet1响应的响应.

In servlet2.jsp, you have used jsp:include. It is including the response of the servlet1 response.

但是 servlet1 ，它将把响应转发到另一个jsp.这样就会发生异常.

But the servlet1, it is going to forward the response to another jsp. So that exception occurs.

为避免这种情况，在Servlet1类中应使用 view.include(request，response); 而不是 view.forward(request，response); .

To avoid this, in Servlet1 class should use view.include(request,response); instead of view.forward(request, response);.

package app;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class Servlet1 extends HttpServlet {        

    @Override
    public void doGet(HttpServletRequest request, 
            HttpServletResponse response) 
            throws ServletException, IOException {                      

        request.setAttribute("servletAttribute", 1);

        RequestDispatcher view = request.getRequestDispatcher("/servlet1.jsp");      
        view.include(request, response);
    }                                                                               
}