This is a step by step slides to study servlet, all the concepts which are required for a servlet are present in this ppt. The whole Servlet is divided into SESSIONS.

1. SESSION – 8
By→ Anuj Kumar Singh

2. SendRedirect in Servlet
The sendRedirect() method of HttpServletResponse interface can be
used to redirect response to another resource, it may be servlet, jsp or
html file.
It accepts relative as well as absolute URL.
It works at client side because it uses the url bar of the browser to make
another request.

3. Difference between forward() and SendRedirect() method
forward() SendRedirect()
The forward() method works at server side. The SendRedirect() method works on client
Side.
It sends the same request and response objects to
another servlet.
It always sends new request.
It works within the server only. It can be used within and outside the server.
Example : request.getRequestDispatcher(“Servlet2”);
foward(request,response);
Example:
response.sendRedirect(“servlet2”);

4. Example of response.sendRedirect()
index.html

5. NewServlet.java

6. Welcome.html
Output

7. ServletConfig Interface
1. An object of ServletConfig is created by web container for each
servlet. This object can be used to get configuration information from
web.xml file.
2. If the configuration information is modified in the web.xml file, we don't
need to change the servlet. So it is easier to manage the web
application if any specific content is modified from time to time.
Advantages of ServletConfiguration
The core advantage of ServletConfig is that you don't need to edit the
servlet file if information is modified from the web.xml file.

8. Methods of ServletConfig interface
1. public String getInitParameter(String name):Returns the parameter
value for the specified parameter name.
2. public Enumeration getInitParameterNames():Returns an enumeration
of all the initialization parameter names.
3. public String getServletName():Returns the name of the servlet.
4. public ServletContext getServletContext():Returns an object of
ServletContext

9. How to get the object ServletConfig
1. getServletConfig() method of Servlet interface returns the object of
ServletConfig.
public ServletConfig getServletConfig();
2. Example of getServletConfig() method
ServletConfig config=getServletConfig();
//Now we can call the methods of ServletConfig interface
String driver =config.getInitParameter(“driver”);
3. Code in web.xml file
<init-param>
<param-name>driver</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</init-param>

10. Example
a. NewServlet.java

11. b. web.xml
Output