<filter>
    <filter-name>Encoding Filter</filter-name>
    <filter-class>EncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
 </filter>
 <filter-mapping>
    <filter-name>Encoding Filter</filter-name>
    <url-pattern>/*</url-pattern>
 </filter-mapping>

public class EncodingFilter implements javax.servlet.Filter {
private String encoding;
public void init(FilterConfig filterConfig) throws ServletException {
    this.encoding = filterConfig.getInitParameter("encoding");
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
    request.setCharacterEncoding(encoding);
    filterChain.doFilter(request, response);
}
public void destroy() {
}