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Question: What is the difference between the getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface and javax.servlet.ServletContext interface?

Answer: The getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface accepts parameter the path to the resource to be included or forwarded to, which can be relative to the request of the calling servlet. If the path begins with a "/" it is interpreted as relative to the current context root.

The getRequestDispatcher(String path) method of javax.servlet.ServletContext interface cannot accepts relative paths. All path must sart with a "/" and are interpreted as relative to curent context root.



Category Servlet Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is the difference between the getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface and javax.servlet.ServletContext interface?
Answer:

The getRequestDispatcher(String path) method of javax.servlet.ServletRequest interface accepts parameter the path to the resource to be included or forwarded to, which can be relative to the request of the calling servlet. If the path begins with a "/" it is interpreted as relative to the current context root.

The getRequestDispatcher(String path) method of javax.servlet.ServletContext interface cannot accepts relative paths. All path must sart with a "/" and are interpreted as relative to curent context root. Source: CoolInterview.com


In case of ServletContext.getRequestDispatacher we must pass the path of the resourse starting with a '/'excluding the contextpath.

For ServletRequest.getRequestDispatcher we can pass the relative path of the resource also. Source: CoolInterview.com

Answered by: Anirudh Narayan | Date: 5/2/2009 | Contact Anirudh Narayan Contact Anirudh Narayan

the limit of the RequestDispatcher which is accessed from ServletRequest is the resource to which we can pass the control should be present in the same web application.

But for ServletContext.getRequestDispatcher, the resource can in web applivation or it can be in same server(like Tomcat) Source: CoolInterview.com

Answered by: Sreenu | Date: 4/29/2010 | Contact Sreenu Contact Sreenu

servletRequest.getRequestDispatcher(path);
here path means either relative path and or context path,both are used to get RequestDispatcher object.

But in case of ServletContext.getRequestDispatcher(path);
here we need to use only context path start with "/" symbol manadatory,relative path is not supported. Source: CoolInterview.com

Answered by: venkateswara reddy gunapati | Date: 6/7/2010 | Contact venkateswara reddy gunapati Contact venkateswara reddy gunapati


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