Reading Initialization parameters.

Reading Initialization parameters:

Syntax to provide the initialization parameter for a servlet

The init-param sub-element of servlet is used to specify the initialization parameter for a servlet.

1. <web-app>  
2.   <servlet>  
3.     ......  
4.       
5.     <init-param>  
6.       <param-name>parametername</param-name>  
7.       <param-value>parametervalue</param-value>  
8.     </init-param>  
9.     ......  
10.   </servlet>  
11. </web-app>  

ServletConfig to get initialization parameter

In this example, we are getting the one initialization parameter from the web.xml file and printing this information in the servlet.

DemoServletInit.java

1. import java.io.*;  
2. import javax.servlet.*;  
3. import javax.servlet.http.*;  
4.   
5. public class DemoServletInit extends HttpServlet {  
6. public void doGet(HttpServletRequest request, HttpServletResponse response)  
7.     throws ServletException, IOException {  
8.   
9.     response.setContentType("text/html");  
10.     PrintWriter PW = response.getWriter();  
11.       
12.     ServletConfig config=getServletConfig();  
13.     String name=config.getInitParameter("name");  
14.     pw.print("Name is: "+driver);  
15.           
16.     pw.close();  
17.     }  
18.   
19. }  
20. Here web.xml is updated as following

<servlet>

    <servlet-name>D</servlet-name>

    <servlet-class>DemoServletInit</servlet-class>

<init-param>  

<param-name>name</param-name>  

<param-value>DiyaShirley</param-value>  

</init-param>  

</servlet>

<servlet-mapping>

    <servlet-name>D</servlet-name>

    <url-pattern>/Demo</url-pattern>

</servlet-mapping>

1. after executing output displays like following:

1. 
   
2.