package fi.foo.filters;

  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;

  public class CharsetFilter implements Filter
   {
   private String encoding;

   public void init(FilterConfig config) throws ServletException
   {
    encoding = config.getInitParameter("requestEncoding");

    if( encoding==null ) encoding="UTF-8";
   }

   public void doFilter(ServletRequest request, ServletResponse response, FilterChain       next)
   throws IOException, ServletException
   {
    // Respect the client-specified character encoding
    // (see HTTP specification section 3.4.1)
    if(null == request.getCharacterEncoding())
      request.setCharacterEncoding(encoding);


    /**
 * Set the default response content type and encoding
 */
 response.setContentType("text/html; charset=UTF-8");
 response.setCharacterEncoding("UTF-8");


    next.doFilter(request, response);
   }

    public void destroy(){}
   }

<!--CharsetFilter start--> 

  <filter>
    <filter-name>CharsetFilter</filter-name>
    <filter-class>fi.foo.filters.CharsetFilter</filter-class>
      <init-param>
        <param-name>requestEncoding</param-name>
        <param-value>UTF-8</param-value>
      </init-param>
  </filter>

  <filter-mapping>
    <filter-name>CharsetFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>