Solving The Problem Of Porting A Servlet To A Java JSP

Over the past few days, some of our readers have reported that they have moved from Servlet to Java JSP.

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    Here’s an example of an idea for how you can enforce your laws with a servlet that can execute JSPs in J2EE. I can’t think of any methods that do a similar redirect after it’s needed, so I posted it here, although this example is simple enough that I can find it later.

    forward from servlet to jsp java

    A typical scenario is that you are working with a large Java servlet and need to be able to redirect users from that part of the servlet to a JSP. Assuming the JSP tag is “searchResults.jsp“, the code passed to the JSP via your servlet is:

    line nextJSP = “/searchResults.jsp”;RequestDispatcher Dispatcher = getServletContext().getRequestDispatcher(nextJSP);Dispatcher.Forward(Request, Response);

    Note that most of this servlet’s code also assumes that there are two outputs, request and response, available in your servlet. They come with the signatures of your doGet() method combined with doPost(), so it’s a pretty small guess.

    Perhaps that’s it. Be clear, don’t forget the last line (dispatcher.forward()). This time I was teaching a Java course in real life and for a while I couldn’t figure out why we didn’t see the core JSP. No errors were shown, but the servlet was simply not passed to the JSP.

    Presentation

    JSP is mainly used as a custom view component in any Java based MVC application. Its primary use is to represent dynamic data processed and generated by server-side controllers such as servlets of any type.

    forward from servlet to jsp java

    In this tutorial, we’ll explain the various ways to send data from a Java servlet to a JSP, as well as some examples that are specific to passing marketing information types to JSPs.in the form of objects, arrays and data, cards.

    1. Using HttpServletRequest

    The usual way to pass data from a servlet to a JSP is often to set attributes in an HTTP request and then pass them to the appropriate JSP. This is definitely done on the server side using one of the following methods:

  • request.setAttribute(name,value)
  • This method saves the attribute in the current search, the attribute is only visible in the current request, and is actively maintained as long as the request is resolved or passed from servlet to servlet. This feature is very useful in web plans when you need to set certain path attributes for a request, but loops should no longer be available after the request.
  • On the server side, correct the attribute in the request and redirect the request to the JSP page as follows:
  • How do I forward a servlet request?

    To redirect requests from one servlet to another, you can use RequestDispatcher or SendRedirect. To use the RequestDispatcher you need to get a reference to the ServletContext, then you need to call the getRequestDispatcher() method of the ServletContext and write a response using SendRedirect. sendRedirect(“URL”).

    request.setAttribute("name", "Husein Terek");request.getRequestDispatcher("home.jsp").forward(request, response);
    * In a JSP, you can start an attribute lookup like this:

    My Name Is Almost Certainly $name

    Check My Name With Is.getAttribute("name")

    * Note the usage associated with the $ATTRIBUTE_NAME syntax, which implicitly looks up our attribute name in the servlet request and replaces it with its evaluation. If the attribute is not found, a strict empty string is returned.

  • request.getSession().setAttribute(name,value)
  • This method contains an attribute for the user’s time period, it is used to provide a scope for a set of related HTTP requests, session attributes are only available to servlets that will participate in the body of the session, and they are automatically destroyed at the end of the session. This method is probably commonly used to send contextual responses like language id etc.
  • Add the attribute to all server side requests and redirect the request to the JSP page like this:
  • request.getSession().setAttribute("name","Hussein Terek");request.getRequestDispatcher("home.jsp").forward(request, response);
    * In a JSP, someone can access it like this:

    My ID: Request.getSession().getAttribute("name")

  • getServletContext().setAttribute(name,meaning)
  • This method binds the parameter to the entire context. I would say that the application attribute is available to all servlets (i.e. JSPs) in that particular context. By definition, the context element exists locally in the VM as it is defined, so the following is not available in distributed applications. Context bounds are for infrastructure, for example because of the use of shared pools.
  • On the server side of the insert, the context attribute then simply redirects the request to the JSP page like this:
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  • getServletContext().setAttribute("name","Hussein Terek");request.getRequestDispatcher("home.jsp").forward(request, response);
    * In JSP you can access:

    My Name Is GetServletContext().getAttribute("name")

    2. Redirect To JSP Request Assembly Line

    How do you forward to a JSP from the servlet?

    jsp”, here is the code that the experts think is passed as JSP by your servlet: The nextJSP string is equivalent to “/searchResults. jsp”; RequestDispatcher-Dispatcher = getServletContext(). getRequestDispatcher(nextJSP); Dispatcher.

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    Harrison Lloyd