servlet in java
- 1. SERVLET Submitted by, B. Soundarya, B.Sc, Nadar Saraswathi College of Arts and Science, Theni.
- 2. SERVLETS Servlet is a simple java program that runs an a java enabled web server or application server. They are used to handle the request obtained from the web serve, process the request, produce the response, then response back to the web server.
- 3. PROPERTIES OF SERVLET Servlets work on the server side. Servlet capable of handling complex request obtained from web server.
- 4. EXECUTION OF SERVLET Execution of servlets involves the six basic step’s: 1. The client send the request to the web server. 2. The web server passes the request and corresponding servlet. 3. The web server receive the request. 4. The servlet processes the request and generate in the response in the form of output. 5. The servlet send the response back to the web server.
- 5. SERVLET ARCHITECTURE WEB BROWSER WEB SERVER SERVLET PROGRAM DATABASE
- 6. ADVANTAGE OF A JAVA SERVLET Servlet is faster than CGI as it not involve the creation of a new process every new request received. Servlet as written in java are platform independent. Remove the overhead of creation a new process for each request of Servlet doesn’t run in a separate process. It is server side components, Servlet inherits the security provided by the web server.
- 7. SERVLET CONTAINER It also know as servlets engine is an integrated set of object that provided run time environment for java servlets components. In simple words, it is a system that manages java servlets components on top of the web server to handle the web client request
- 8. SERVICES PROVIDED BY THE SERVLET CONTAINER Networking Services Decode and encode MIME based messages Manage Servlet container Resource Management Security Service Session Management
- 9. NETWORK SERVICES Load a Servlet class. The loading may be from a local file system, a remote file system or other network service. The Servlet container provides the network service over which the request and response are sent.
- 10. DECODE AND ENCODE MIME BASED MESSAGES Provides the service of decoding and encoding MIME- based message. Encoding the container provides the network services.
- 11. MANAGE SERVLET CONTAINER Manage lifecycle of a Servlet. Three methods are central to the life cycle of a Servlet. These are init(),service(),and destroy(). They are implemented by every Servlet and are invoked at specific times by the server
- 12. RESOURCE MANAGEMENT Manages the static and dynamic resource such as HTML files, Servlet and JSP page. The init( ), service( ), and destroy( ) methods are the life cycle methods of the Servlet. These are invoked by the server. The get Servlet Con fig( ) method is called by the Servlet to obtain initialization parameters.
- 13. SECURITY SERVICES Handle authorization and authentication of resource access. The Servlet Request interface includes methods that allow you to read the names and values of parameters that are included in a client request.
- 14. SESSION MANAGEMENT Maintains a session by appending a session ID to the URL path. The Http Servlet class provides specialized methods that handle the various types of HTTP requests. A Servlet developer typically overrides one of these methods. These methods are do Delete(), doGet(), doHead(), doOptions(), doPost(), doPut(), and doTrace().
- 15. THANK YOU!!!