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Currently, the RequestDispatcher interface provides the ability to send a request from the point of view of another resource, which can be code, a servlet, or a JSP. Of course, this interface can also be used, I would say, to include content from another resource. This is one way to work together with servlets.
Transfer receipt from servlet to another web page (servlet, jsp file or HTML file) on the server. This method allows Preview Servlet request and another resource to help you generate it answer.
For a large pass RequestDispatcher
getrequestdispatcher()
, ServletRequest
Path parts and object parameters are adjusted accordingly specific path of the target resource.
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forward
must be called before a response is made the direction of the client is fixed (before the output of the response body is flushed). If the answer has already been checked, this system is triggered IllegalStateException
. In the case of an unconfirmed product, the response buffer is automatically unloaded in front of the front.
Request and response parameters must match Objects as received or to be received on the platform Me methods of the calling servlet. Subclasses of a specific ServletRequestWrapper
or Classes ServletResponseWrapper
that they shrink. method
this configures the dispatcher source of the given request DispatcherType.FORWARD
.
The RequestDispatcher interface defines an object that receives most of the requests from the client and also forwards them to a resource (eg servlet, JSP, HTML file). This GUI uses the following two methods:
public nullify forward(ServletRequest, ServletResponse): This is forwarded as a request from one servlet to another when you need a resource (e.g. servlet, JSP, HTML file).
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public void include(ServletRequest, ServletResponse response): include resource content (e.g. servlet, JSP, HTML file) in the response.
Difference Between Forward() And Include()
To understand the difference between these two methods, let’s look at a specific example. Suppose you have pages with lots of X and Y. On page X you have an include tag, which means the control is on page X anyway until the program encounters the include tag, after which your current control web is transmitted-page Y. When most processing of page Y is complete, the return returns to Internet X, starting immediately after the count tag and remaining in X until the end.
In this case, it turns out that the continuation response is sent to the client on the X.We side
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We have now proven that we are taking the same example using forward . We have the same side X and therefore Y. On the X side we get the front beacon. In this case, the most important control is on the X side as long as it doesn’t stick out forward. After this approach, control is transferred to Y. The main difference that is relevant here is that control returns to X, but does not return, it will end up on the Y side until our end.
In this case, the final response to the client is often sent to the Y side.
Example:
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For example, I can use methods involving redirection and . I use the include method to replace the contents of the current page, and when I’m ready to go to the next page, I use the forward method.
ANDimport
Servlet communication refers to how one servlet interacts with another. Sometimes servlets usually pass general information that can be passed directly from one servlet to another through a series of method calls.
java.io.*; Aimport java.io.*; Aimport javax.servlet.*; Aimport javax.servlet.http.*; public class check extends HttpServlet public void doPost(HttpServletRequest, HTTPServletResponse) throws a ServletException, ioException response.setContentType("text/html"); PrintWriter pwriter = response.getwriter(); . . . String name = request.getParameter("uname"); The line pass=request.getParameter("uppass"); . . . . . if(name.equals("Chaitanya") && pass. equals("Book for beginners")) RequestDispatcher dis=request.getRequestDispatcher("Welcome"); dis.forward(request, response); different pwriter.print("Invalid username or password!"); RequestDispatcher dis=request.getRequestDispatcher("index.html"); dis.include(request, response); . . . . . . . . . . . . . . . A
Import
java.io.*;import javax.servlet.*;import javax.servlet.http.*; The public class WelcomeUser extends HttpServlet population is invalid doPost(HttpServletRequest, HttpServletResponseResponse) throws ServletException, IOException Response .setContentType("text/html"); PrintWriter pwriter = response. get writer(); channel name=request. getparameter("name"); pwriter.print("Hi "+name+"!"); Pwriter .print(" OKo Welcome to the book for beginners. Fr");
RequestDispat interfacecher is used to send a client request to another web resource, which can be an HTML page, another servlet, JSP, etc. It provides the following two methods: Client void forward(ServletRequest request, ServletResponse response) throws a ServletException, java . Good
The RequestDispatcher interface allows you to do almost any redirect/enable on the server side, while sendRedirect() does the redirect on the client side. the user then creates a new content request on the same or another forum.
The difference between these two methods is that the direct method closes the output stream after it has been called, while this include method leaves the output set open. The include method takes all the content from another resource and includes it in the servlet.
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