Example ServletConfig to get all the initialization parameters

Question : Example of ServletConfig to get all the initialization parameters

Ans : 

    we are getting all the initialization parameter from the web.xml file and printing this information in the servlet.

DemServlet.java

1.     import java.io.IOException;  

2.     import java.io.PrintWriter;  

3.     import java.util.Enumeration;  

4.       

5.     import javax.servlet.ServletConfig;  

6.     import javax.servlet.ServletException;  

7.     import javax.servlet.http.HttpServlet;  

8.     import javax.servlet.http.HttpServletRequest;  

9.     import javax.servlet.http.HttpServletResponse;  

10.     

11.     

12.   public class DemServlet extends HttpServlet {  

13.   public void doGet(HttpServletRequest request, HttpServletResponse response)  

14.           throws ServletException, IOException {  

15.     

16.       response.setContentType("text/html");  

17.       PrintWriter out = response.getWriter();  

18.         

    ServletConfig config=getServletConfig();  

    Enumeration<String> e=config.getInitParameterNames();  

          

    String str="";  

    while(e.hasMoreElements()){  

    str=e.nextElement();  

    out.print("<br>Name: "+str);  

    out.print(" value: "+config.getInitParameter(str));  

    }  

          

    out.close();  

19.   }  

20.     

21.   }  

web.xml

1.     <web-app>  

2.       

3.     <servlet>  

4.     <servlet-name>DemServlet</servlet-name>  

5.     <servlet-class>DemServlet</servlet-class>  

6.       

<init-param>  

<param-name>username</param-name>  

<param-value>system</param-value>  

</init-param>  

7.       

8.     <init-param>  

9.     <param-name>password</param-name>  

10.   <param-value>oracle</param-value>  

11.   </init-param>  

12.     

13.   </servlet>  

14.     

15.   <servlet-mapping>  

16.   <servlet-name>DemServlet</servlet-name>  

17.   <url-pattern>/servlet1</url-pattern>  

18.   </servlet-mapping>  

19.     

20.   </web-app>  

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