GenericServlet class
- GenericServlet class implements Servlet, ServletConfig, and Serializable interfaces.
- It provides the implementation of all the methods of these interfaces except the service method.
- Figure:
- GenericServlet class can handle any type of request so it is protocol-independent.
- Figure:
- You may create a generic servlet by inheriting the GenericServlet class and providing the implementation of the service method.
- public void init(ServletConfig config): is used to initialize the servlet.
- public abstract void service(ServletRequest request, ServletResponse response): provides service for the incoming request. It is invoked at each time when user requests for a servlet.
- public void destroy(): is invoked only once throughout the life cycle and indicates that servlet is being destroyed.
- public ServletConfig getServletConfig(): returns the object of ServletConfig.
- public String getServletInfo(): returns information about servlet such as writer, copyright, version etc.
- public void init(): it is a convenient method for the servlet programmers, now there is no need to call super.init(config)
- public ServletContext getServletContext(): returns the object of ServletContext.
- public String getInitParameter(String name): returns the parameter value for the given parameter name.
- public Enumeration getInitParameterNames(): returns all the parameters defined in the web.xml file.
- public String getServletName(): returns the name of the servlet object.
- public void log(String msg): writes the given message in the servlet log file.
- public void log(String msg,Throwable t): writes the explanatory message in the servlet log file and a stack trace.
Tags:
Java
