PaginatedList.java

import java.io.Serializable;
import java.util.List;

/**
 * Interface filha de java.util.List que contém dados usados para paginação de resultados.
 * 
 * @author Otávio Scherer Garcia
 * @param <E> Tipo da classe interna armazenada na lista.
 */
public interface PaginatedList<E>
	extends List<E>, Serializable {

	/**
	 * Retorna a quantidade total de registros encontrados.
	 * 
	 * @return quantidade total de registros encontrados.
	 */
	int getTotalSize();

	/**
	 * Retorna o indice da página corrente.
	 * 
	 * @return indice da página corrente.
	 */
	int getCurrentPage();

	/**
	 * Retorna a quantidade de páginas.
	 * 
	 * @return quantidade de páginas.
	 */
	int getTotalPages();

	/**
	 * Retorna o indice do primeiro registro.
	 * 
	 * @return indice do primeiro registro.
	 */
	int getFirstResult();
}

PaginatedListWrapper.java

import java.util.ArrayList;
import java.util.List;

import com.google.common.collect.ForwardingList;

/**
 * Implementação padrão para lista paginada. Internamente essa classe contém a lista somente com os resultados
 * já filtrados para paginação. Há métodos auxiliares para conhecer os dados da paginação como getTotalSize(),
 * getCurrentPage(), getTotalPages() e getFirstResult() que podem ser encontrados na interface
 * {@link PaginatedList}.
 * 
 * @author Otávio Scherer Garcia
 * @param <E> Tipo da classe interna armazenada na lista.
 */
public final class PaginatedListWrapper<E>
	extends ForwardingList<E>
	implements PaginatedList<E> {

	private static final long serialVersionUID = 5356890502328382635L;

	private List<E> elements;
	private int totalSize;
	private int currentPage;
	private int totalPages;
	private int firstResult;

	public PaginatedListWrapper(List<E> elements, int totalSize, int currentPage, int totalPages, int firstResult) {
		this.elements = elements;
		this.totalSize = totalSize;
		this.currentPage = currentPage;
		this.totalPages = totalPages;
		this.firstResult = firstResult;
	}

	public PaginatedListWrapper() {
		this.elements = new ArrayList<>();
	}
	
	@Override
	protected List<E> delegate() {
		return elements;
	}

	public String getLink(String uriPattern, int page) {
		String uri = uriPattern.replace("{page}", String.valueOf(page));
		return uri.endsWith("?") ? uri.substring(0, uri.length() - 1) : uri;
	}

	public int getTotalPages() {
		return totalPages;
	}

	public int getCurrentPage() {
		return currentPage;
	}

	public int getTotalSize() {
		return totalSize;
	}

	@Override
	public int getFirstResult() {
		return firstResult;
	}
}

paging.tagx

<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
		xmlns:html="http://www.w3.org/1999/xhtml"
		xmlns:fmt="http://java.sun.com/jsp/jstl/fmt"
		xmlns:c="http://java.sun.com/jsp/jstl/core"
		version="2.1">
	<jsp:directive.tag body-content="empty" />
	<jsp:directive.attribute name="results" type="icob.model.pg.PaginatedList" required="true" />
	<jsp:directive.attribute name="uriPattern" type="java.lang.String" required="true" />
	<c:set var="uriPattern" value="${uriPattern}?${pageContext.request.queryString}" />
	
	<jsp:scriptlet><![CDATA[
	int viewcount = 9;
	int initcount = results.getCurrentPage() - viewcount + 1;
	int finalcount = results.getCurrentPage() + viewcount;

	if (initcount < 1) {
		finalcount += initcount * (-1);
		initcount = 1;
	}

	if (finalcount > results.getTotalPages()) {
		initcount += results.getTotalPages() - finalcount - 1;
		initcount = (initcount < 1) ? 1 : initcount;
		finalcount = results.getTotalPages() + 1;
	}

	request.setAttribute("initcount",  initcount);
	request.setAttribute("finalcount", finalcount);
	]]></jsp:scriptlet>
	
	<ul class="pagination">
		<c:choose>
			<c:when test="${results.getCurrentPage() gt 1}">
				<li><a href="${results.getLink(uriPattern, results.getCurrentPage() - 1)}">&#171;</a></li>
			</c:when>
			<c:otherwise>
				<li class="disabled"><a>&#171;</a></li>
			</c:otherwise>
		</c:choose>

		<c:if test="${empty results}">
			<li class="disabled "><a>1</a></li>
		</c:if>

		<c:if test="${initcount gt 1}">
			<li><a href="${results.getLink(uriPattern, 1)}">1</a></li>
			<li class="disabled"><a>...</a></li>
		</c:if>

		<c:choose>
			<c:when test="${empty results and results.getTotalPages() ge results.getCurrentPage()}">
				<span class="page-numbers current">1</span>
			</c:when>
			<c:otherwise>
				<c:forEach begin="${initcount}" end="${finalcount - 1}" var="y" varStatus="x">
					<c:choose>
						<c:when test="${y eq results.getCurrentPage()}">
							<li class="active"><a>${y}</a></li>
						</c:when>
						<c:otherwise>
							<li><a href="${results.getLink(uriPattern, y)}">${y}</a></li>
						</c:otherwise>
					</c:choose>
				</c:forEach>
			</c:otherwise>
		</c:choose>

		<c:if test="${finalcount lt results.getTotalPages()}">
			<li class="disabled"><a>...</a></li>
			<li><a href="${results.getLink(uriPattern, results.getTotalPages())}">${results.getTotalPages()}</a></li>
		</c:if>

		<c:choose>
			<c:when test="${results.getTotalPages() gt results.getCurrentPage()}">
				<li><a href="${results.getLink(uriPattern, results.getCurrentPage() + 1)}">&#187;</a></li>
			</c:when>
			<c:otherwise>
				<li class="disabled"><a>&#187;</a></li>
			</c:otherwise>
		</c:choose>
	</ul>

	<p>
		<fmt:message key="paging">
			<fmt:param value="${results.getFirstResult() + 1}" />
			<fmt:param value="${results.getFirstResult() + results.size()}" />
			<fmt:param value="${results.getTotalSize()}" />
		</fmt:message>
	</p>
</jsp:root>

using.jspx

<tags:npaging uriPattern="/plan/page-{page}/" results="${planList}"/>