My First Servelt Filter

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 id="WebApp_ID" version="2.5">
 <display-name>testWebApp</display-name>

 <filter>
  <filter-name>MyFirstFilter</filter-name>
  <filter-class>com.test.MyFirstFilter</filter-class>
  <init-param>
   <param-name>fp1</param-name>
   <param-value>first value 1</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>MyFirstFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
</web-app>

MyFirstFilter.java

package com.test;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyFirstFilter implements Filter
{
    String fv1 = "";

    @Override
    public void destroy()
    {
        System.out.println("MyFirstFilter.destroy()");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException
    {
        System.out.println("MyFirstFilter.doFilter(...)");

        if (request instanceof HttpServletRequest && response instanceof HttpServletResponse)
        {
            HttpServletRequest req = (HttpServletRequest) request;
            HttpServletResponse resp = (HttpServletResponse) response;
            
            req.setCharacterEncoding("UTF-8");

            resp.setDateHeader("Expires", -1);
            resp.setHeader("Cache-Control", "no-cache");
            resp.setHeader("Pragma", "no-cache");
        }

        filterChain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException
    {
        System.out.println("MyFirstFilter.init(...)");

        fv1 = filterConfig.getInitParameter("fp1");
    }
}

MyFirstSpringClass

package com.test;

public class MyFirstSpringClass
{

    public String SayHello(String name)
    {
        return "helo" + name;
    }
    
    /**
     * Factory Method Test
     * @return
     */
    public static synchronized String getResourceConfig()
    {
        return "mystring";
    }
}