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What is the difference between servlet config and servlet
context.
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Answer Posted / mansi
• Signature: public interface ServletConfig
ServletConfig is implemented by the servlet container to
initialize a single servlet using init(). That is, you can
pass initialization parameters to the servlet using the
web.xml deployment descriptor. For understanding, this is
similar to a constructor in a java class.
Example code:
<servlet>
<servlet-name>ServletConfigTest</servlet-name>
<servlet-class>com.javapapers.ServletConfigTest</servlet-class>
<init-param>
<param-name>topic</param-name>
<param-value>Difference between ServletConfig and
ServletContext</param-value>
</init-param>
</servlet>
• Signature: public interface ServletContext
ServletContext is implemented by the servlet container for
all servlet to communicate with its servlet container, for
example, to get the MIME type of a file, to get dispatch
requests, or to write to a log file. That is to get detail
about its execution environment. It is applicable only
within a single Java Virtual Machine. If a web applicationa
is distributed between multiple JVM this will not work. For
understanding, this is like a application global variable
mechanism for a single web application deployed in only one JVM.
The ServletContext object is contained within the
ServletConfig object. That is, the ServletContext can be
accessed using the ServletConfig object within a servlet.
You can specify param-value pairs for ServletContext object
in <context-param> tags in web.xml file.
Example code:
<context-param>
<param-name>globalVariable</param-name>
<param-value>javapapers.com</param-value>
</context-param>
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