Servlet api & servlet http package

Servlet api & servlet http package

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  Advanced java programming ServletAPI & Servlet Http package By P.Abinaya
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   Two packagescontain the classes and interfaces that are required to build servlets.  Then are javax.servlet and javax.servlet.http.  The Servelt API has been in a process of ongoing development and enhancement.  The current servlet specification is version 2.4.
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   The javax.servlet.httppackage contains a number of classes and interfaces that describe and define the contracts between a servlet class running under the HTTP protocol and the runtime environment provided for an instance of such a class by a conforming servlet container.
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   init()  Service() Destroy()  That methods are the life cycle methods of servlet.  The getServletConfig() method is called by the servlet to obtain initialization parameter.
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  HttpServletRequest Extends the ServletRequestinterface to provide request information for HTTP servlets. HttpServletResponse Extends the ServletResponse interface to provide HTTP-specific functionality in sending a response.
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  The javax.servlet.http package containsa number of interfaces and classes that are commonly used by servlet developers. That its functionality makes it easy to build servlets that work with HTTP requests and responses.
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   The HttpServletRequestInterface  Extends the ServletRequest interface to provide request information for HTTP servlets.  The HttpServletRequest Interface Extends the ServletResponse interface to provide HTTP-specific functionality in sending a response.
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   The Cookieclass encapsulates a cookie.  A cookie is stored on a client and contains state information.  Some of the information that is saved for each cookie includes the following: o The name of the cookie. o The value of the cookie. o The expiration date of the cookie. o The domain and path of the cookie.
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   The HttpServletclass provides specialized methods that handle the various types of HTTP requests.  The methods are  doDelet()  DoGet()  doHead()  doOptions()  doPut()  doTrace().