120 How many ways to create RequestDispatcher object in servlet | adv java tutorial

#How #many #ways to #create #RequestDispatcher #object in Servlet: There are 3 ways #advance #java #servlet #programming #tutorial Approach 1: (Using Request object)
In source servlet program:

RequestDispatcher rd=reqeust.getRequstDistpatcher("/welcomeurl");

/welcomeurl is the url pattern of destination servlet program, keeping '/' is optional

rd.forward(request, response); //Source Servlet program forwards the request to destination servlet program

OR

rd.include(request, response); //Source Servlet program includes the response of destination servlet program

Approach 2: (Using ServletContext object)
-----------
In source servlet program:

ServletContext sc=getServletContext();
RequestDispatcher rd=sc.getRequstDistpatcher("/welcomeurl");

/welcomeurl is the url pattern of destination servlet program, keeping '/' is optional

rd.forward(request, response); //Source Servlet program forwards the request to destination servlet program

OR

rd.include(request, response); //Source Servlet program includes the response of destination servlet program

Approach 3: (Using ServletContext obj with getNamedDispatcher)
-----------
In source servlet program:

ServletContext sc=getServletContext();
RequestDispatcher rd=sc.getNamedDistpatcher("welcomeservlet");

'welcomeservlet' is the logical-name/servlet-name which has been configured in web.xml file of destination servlet program
servlet
servlet-name welcomeservlet /servlet-name
servlet-class WelcomeServlet /servlet-class
/servlet
serlvet-mapping
servlet-name welcomeservlet /servlet-name
url-pattern /welcomeurl /url-pattern
/serlvet-mapping
rd.forward(request, response); //Source Servlet program forwards the request to destination servlet program

OR

rd.include(request, response); //Source Servlet program includes the response of destination servlet program
#Example #java #web #application using above three ways to create #RequestDispatcher object: