Unit-8 Servlets.pptx - Servlets Java Servlets and common gateway interface(CGI Programming The life Cycle of a Servlet Using Tomcat for Servlet

Unit-8 Servlets.pptx - Servlets Java Servlets and common...

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Servlets
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Java Servlets and common gateway interface (CGI) Programming, The life Cycle of a Servlet, Using Tomcat for Servlet Development, A simple java Servlet, the javax. servlet Package, the javax. servlet. http Package, Anatomy of a Java servlet, Reading data from a Client, Reading HTTP Request Headers , Sending data to a client and writing the HTTP response Header, Working with cookies, Tracking sessions
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Java Servlets are programs that run on a Web or Application server and act as a middle layer between a requests coming from a Web browser or other HTTP client and databases or applications on the HTTP server. Explicit/Implicit Data Sent from client to server-side program Processed Return Explicit data 1. Explicit Data: Infromation received from client 2. Implicit Data: HTTP Servlet API Javax.servlet Javax.servlet.http
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1. For each request, it starts a new process. 2. If number of clients increases, it takes more time for sending response. 3. For each request, it starts a process and Web server is limited to start processes. 4. It uses platform dependent language e.g. C, C++, perl.
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Java Servlets & common gateway interface (CGI) Programming, Java Servlets often serve the same purpose as programs implemented using the Common Gateway Interface (CGI). But Servlets offer several advantages in comparison with the CGI. Performance is significantly better. Servlets execute within the address space of a Web server. It is not necessary to create a separate process to handle each client request. Servlets are platform-independent becaus e they are written in Java. Java security manager on the server enforces a set of restrictions to protect the resources on a server machine. The full functionality of the Java class libraries is available to a servlet. It can communicate with applets, databases, or other software via the sockets and RMI mechanisms
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Java Servlets avoids inefficiencies: By loading a single copy of Java Servlet into JVM Java Servlet has persistence: It remains alive , as the request is fulfilled.
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Web Server (Application Logic) Database/ FileSystem (Persistent Storage) Application/Browser (User Interface) A web server is a program running on the server that listens for incoming requests and services those requests as they come in. Once the web server receives a request, depending on the type of request the web server might look for a web page, or it might execute a program on the server. It will always return some kind of results to the web browser, even if its simply an error message saying that it couldn’t process the request. By default the role of a web server is to serve static pages using the http protocol Web servers can be made dynamic by adding additional processing capability to the server
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11 Tomcat is a stand alone web server and a servlet container It is open source and free for usage It is written in Java You do not have to be a Java programmer to use it
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