12 What Is the Use Of Servlet Context in Web.xml File
ServletContext is created by the web container at time of deploying the project.
It can be used to get configuration information from web.xml file.
There is only one ServletContext object per web application.
If any information is shared to many servlet, it is better to provide it from the web.xml file using the context-param tag.
Advantage of ServletContext
• Easy to maintain if any information is shared to all the servlet, it is better to make it available for all the servlet.
• We provide this information from the web.xml file, so if the information is changed, we don't need to modify the servlet. Thus it removes maintenance problem.
Usage of ServletContext
There can be a lot of usage of ServletContext object. Some of them are as follows:
1. The object of ServletContext provides an interface between the container and servlet.
2. The ServletContext object can be used to get configuration information from the web.xml file.
3. The ServletContext object can be used to set, get or remove attribute from the web.xml file.
4. The ServletContext object can be used to provide inter-application communication.
How to get the object of ServletContext interface
1. getServletContext() method of ServletConfig interface returns the object of ServletContext.
//We can get the ServletContext object from ServletConfig object
ServletContext context=getServletConfig().getServletContext();
2. getServletContext() method of GenericServlet class returns the object of ServletContext.
//Another way to get the ServletContext object
ServletContext application=getServletContext();
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