Copy @WebServlet(name = "ServletA",
urlPatterns = {
"/ServletA",
"/AForwardToB",
"/AIncludesB",
"/AAsyncDispatchToB",
"*.a"
},
asyncSupported = true
)
public class ServletA extends HttpServlet {
public static void printCurrentMappingDetails(HttpServletRequest request,
PrintWriter out) throws IOException {
HttpServletMapping forwardMapping = (HttpServletMapping) request.getAttribute(RequestDispatcher.FORWARD_MAPPING);
HttpServletMapping includeMapping = (HttpServletMapping) request.getAttribute(RequestDispatcher.INCLUDE_MAPPING);
HttpServletMapping asyncMapping = (HttpServletMapping) request.getAttribute(AsyncContext.ASYNC_MAPPING);
out.print("<p> " + request.getHttpServletMapping() + "</p>");
out.print("<p> FORWARD_MAPPING: " + forwardMapping + "</p>");
out.print("<p> INCLUDE_MAPPING: " + includeMapping + "</p>");
out.print("<p> ASYNC_MAPPING: " + asyncMapping + "</p>");
out.print("<hr />");
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpServletMapping mapping = request.getHttpServletMapping();
if (mapping.getPattern().equals("/AForwardToB")) {
RequestDispatcher rd = request.getRequestDispatcher("/ServletB");
rd.forward(request, response);
return;
}
if (mapping.getPattern().equals("/AAsyncDispatchToB")) {
AsyncContext asyncContext = request.startAsync();
asyncContext.dispatch("/ServletB");
return;
}
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet ServletA</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet ServletA at " + request.getContextPath() + "</h1>");
printCurrentMappingDetails(request, out);
if (mapping.getPattern().equals("/AIncludesB")) {
RequestDispatcher rd = request.getRequestDispatcher("/ServletB");
rd.include(request, response);
}
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
//Servlet B is a generic servlet.
@WebServlet(name = "ServletB", urlPatterns = {
"/ServletB",
"*.b"
})
public class ServletB extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet ServletB</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet ServletB at " + request.getContextPath() + "</h1>");
ServletA.printCurrentMappingDetails(request, out);
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}