EncodingFilter.java

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package com.dev2012.noticiasunp.util;

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;

/**
 *
 * @author Hugo
 */
public class EncodingFilter implements Filter {
    private String encoding = "utf-8";

    @Override
    public void doFilter(ServletRequest request,

    ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
            request.setCharacterEncoding(encoding);
            filterChain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
            String encodingParam = filterConfig.getInitParameter("encoding");
            if (encodingParam != null) {
                    encoding = encodingParam;
            }
    }

    @Override
    public void destroy() {
            // nothing todo
    }
}

web.xml

<!-- Agrega esto a tu web.xml -->
<filter>
	<filter-name>EncodingFilter</filter-name>
	<filter-class>
		com.dev2012.noticiasunp.util.EncodingFilter
	</filter-class>

	<init-param>
		<param-name>encoding</param-name>
		<param-value>UTF-8</param-value>
	</init-param>
    </filter>

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