Servlets

Request forward from servlet to JSP/HTML :
http://www.java-tips.org/java-ee-tips/javaserver-pages/how-to-forward-requests-from-servlet-t.html
http://www.codestyle.org/java
http://www.codestyle.org/java/servlets/faq-API.shtml
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/Servlets9.html
servlet and jsp book – Head First – download
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http://knowfree.net/2008/05/23/head-first-servlets-and-jsp-2nd-edition.kf – jsp & servlet headfirst
http://knowfree.net/2008/04/17/head-first-servlets-and-jsp-passing-the-sun-certified-web-component-developer-exam.kf
General:
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http://www.tech-faq.com/j2ee.shtml
 
 

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Introduction about http

What does WebServer do:
A WebServer takes the clients request and gives something back to the client.
Server responds with the status code.
a.    404 – Not found error. – The server cannot find the thing what the client asked.
b.    200 – OK. Server successfully send the response to the client what it is expecting.
What does Web Client [...]

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Servlet life cycle

Servlet Life Cycle:
init()
service()
destroy()
§    container load the servlet class.
§    Container Instantiate servlet. It runs the constructor. The constructor is default one given by compiler.
§    Container calls the init() method after Servlet Instance is created. It will be called only once in servlet lifecycle, must complete before container call the service().
§    Then container call the service() method.
§    [...]

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Web app Architecture

Container:
Container helps servlets.
It instantiate the servlet or make a thread to handle the request
It calls the servlet’s doGet() or doPost() method
It create HTTP request and response object to the servlet.
It manages the life cycle of servlet.
It finds the URL in DD to find the correct servlet for the request.
[...]

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Attribute and Listener

Attributes and Listeners:
 
Servlet init parameter:
            In order to hardcode the value in the servlet, we can put(configure) that value in the Deployment Descriptor(DD). For example
 
            Printwriter out = response.getWriter();
            Out.printl(boo@gmail.com);
 
Instead of hard coding like this we can mention this value in DD, by that without touching the servlet, he can change the value in DD [...]

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