Java Servlet Programing Laungage

The following example illustrates the use of the getParameterValues method to get all favourite music selected by the user.The code for this servlet is as follows:

index.html

<html>
 <head>
  <title>Check box Demo</title>
 </head>
 <body>
  <form method = "post" action = "music">
  <p>Which type of music you like it ? </p>
  <input type = "checkbox" name ="favouritemusic" 
value = "Rock">
   Rock<br>
  <input type = "checkbox" name ="favouritemusic" 
value = "Jazz">Jazz<br>
  <input type = "checkbox" name ="favouritemusic" 
value = "hiphop">hiphop.<br>
  <input type = "checkbox" name ="favouritemusic" 
value = "pop">pop<br>
  <input type = "checkbox" name ="favouritemusic" 
value = "heavy rock">heavy rock<br>
  <input type ="submit" name= "submit">
  </form>
 </body>
</html>

web.xml

<web-app>
 <servlet>
  <servlet-name>H1</servlet-name>
  <servlet-class>GetParamValues</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>H1</servlet-name>
  <url-pattern>music</url-pattern>
 </servlet-mapping>
</web-app>

GetParamValues.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetParamValues extends HttpServlet{
  protected void doPost(HttpServletRequest request, 
    HttpServletResponse response)throws ServletException,IOException 
{
  String[] values=request.getParameterValues("favouritemusic");
  response.setContentType("text/html");
  PrintWriter pw = response.getWriter();
  if(values!=null)
  {
   int length=values.length;
   for(int i=0;i<length;i++)
   pw.println("<br>Favourite Music : " + values[i]);
  }
 }
 }