Difference between servletContext and ServletConfig

Author posted by Jitendra on Posted on under category Categories Servlet and tagged as Tags with 1 Comment on Difference between servletContext and ServletConfig

What is difference between servletContext and ServletConfig?

ServletConfig
ServletConfig is implemented by the servlet container to initialize a single servlet using init().  you can pass initialization parameters to the servlet using the web.xml deployment descriptor. Every servlet has its own ServletConfig object.

Example code:

<servlet>
<servlet-name>ServletConfigTest</servlet-name>
<servlet-class>com.shivasoft.ServletConfigTest</servlet-class>
<init-param>
<param-name>article</param-name>
<param-value>Difference between servletContext and ServletConfig</param-value>
</init-param>
</servlet>

ServletContext
ServletContext is implemented by the servlet container for all servlet to communicate with its servlet container. It is applicable only within a single Java Virtual Machine.
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. ServletContext is created at the application level and shared by all the Servlet codes.

Example : Database string used by the application.

<context-param>
<param-name>dbString</param-name>
<param-value>Provider=MySQLProv;Data Source=shivasoft;User Id=shiva; Password=soft;</param-value>
</context-param>

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One thought on “Difference between servletContext and ServletConfig”

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