The document outlines the lifecycle of Java Servlets, detailing the initialization, handling of requests, and destruction processes. It includes examples of servlet configurations within the web.xml file, showcasing how servlets like 'authentication' and 'addition' are set up and mapped to specific URL patterns. Code snippets illustrate the implementation of the init, service, and destroy methods within a servlet class.

1. Java/J2ee Programming Training
Servlet Life Cycle

2. Page 2Classification: Restricted
Agenda
• Understand Servlet life cycle

3. load Login.class
Constructor
web.xml
<servlet>
<servlet-name>Authetication</servlet-name>
<servlet-class>com.example. Login</servlet-class>
<init-param>
<param-name>email</param-name>
<param-value>test@gmail.com</param-value>
</init-param>
</servlet>
init(servletConfig)
ServletConfig
email=test@gmail.com

4. http://localhost:15124/LoginApp/Login.do
Login
web.xml
<servlet-mapping>
<servlet-name>Authentication</servlet-name>
<url-pattern>/Login.do</url-pattern>
</servlet-mapping>
http://localhost:15124/LoginApp/Login.do
http://http://localhost:15124/LoginApp/Login.do
service
service
service
Register

5. web.xml
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/Login>
</servlet-mapping>
destroy()

6. http://localhost:15124/LoginApp/Login.do
web.xml
<servlet-mapping>
<servlet-name>Authentication</servlet-name>
<url-pattern>/Login.do</url-pattern>
</servlet-mapping>
http://localhost:15124/LoginApp/Login.do
http://localhost:15124/LoginApp/Login.do
service
service
service
init()
destroy()

7. class Login extends HttpServlet
{
public void init(ServletConfig config)
{
}
public void doGet(HttpServletRequest req,HttpServletResponse res)
{
}
public void destroy()
{
}
}
http://localhost:15124/LoginApp/Login.do
http://localhost:15124/LoginApp/Login.do
http://localhost:15124/LoginApp/Login.do

8. class Login extends HttpServlet
{
public void init(ServletConfig config)
{
String email = config.getInitParameter(“email”);
}
public void doGet(HttpServletRequest req,HttpServletResponse res)
{ System.out.println(“Code for servicing the client”);
}
public void destroy()
{ System.out.rintln(“deallocation resources”);
}
}
http://localhost:15124/LoginApp/Login
http://localhost:15124/LoginApp/Login
http://localhost:15124/LoginApp/Login
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>com.example. Login</servlet-class>
<init-param>
<param-name>email</param-name>
<param-value>test@gmail.com</param-value>
</init-param>
</servlet>
ServletConfig
email=test@gmail.com
web.xml

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<servlet>
<servlet-name>Addition</servlet-name>
<servlet-
class>com.example.controller.SumServlet</servlet-
class>
</servlet>
<servlet-mapping>
<servlet-name>Addition</servlet-name>
<url-pattern>/add.do</url-pattern>
</servlet-mapping>
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