The Servlet Technology Model

  • The getWriter() method of the ServletResponse interface returns a PrintWriter object suitable for writing character data in the response.
  • The setValue() method of the Cookie class is used to assign a new value to a cookie after the cookie is created.
  • A cookie is created by the server on request from a client. It is stored on a client computer.
  • The getOutputStream() method returns a ServletOutputStream suitable for writing binary data in the response.
  • The getWriter() method of the ServletResponse interface returns a PrintWriter object suitable for writing character data in the response.
  • The sendError() method of the HttpResponse interface sends an error response to the client using the specified status code and message.
  • The getRequestURL() method of the HttpServletRequest interface returns the URL associated with the request as a String.
  • The getCookies() method of the HttpServletRequest interface returns an array of cookie objects that a client sends with a request. However, if no cookies are sent, this method returns a null value.
  • A servlet has three life cycle methods. They are init(), service(), and destroy().
  • A servlet has no main() method. The container is responsible for managing the life-cycle of a servlet.
  • The servlet init parameters are read only once when the container initializes the servlet.
  • Before calling the init() method, a servlet class must be loaded and instantiated.
  • The element of the deployment descriptor declares the initialization parameters that are applicable for an entire Web application.
  • For each request, the Container creates a separate thread.
  • The init() and destroy() methods are called only once in the life of a servlet.

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The Servlet Technology Model

  • The getWriter() method of the ServletResponse interface returns a PrintWriter object suitable for writing character data in the response.
  • The setValue() method of the Cookie class is used to assign a new value to a cookie after the cookie is created.
  • A cookie is created by the server on request from a client. It is stored on a client computer.
  • Continue reading