分享struts2做的一个分页按钮样式

首先是分页内容的辅助类

package cn.com.timekey.drugmonitor.utils.db;

import java.util.Collections;
import java.util.List;

import org.hibernate.criterion.CriteriaSpecification;

/**
 * 分页常用的bean类。<br>
 * 里面包含搜索返回的List，查询条件DetachedCriteria及分页菜单用到的数据等。
 * 
 * @author KennyLee E-mail:[email protected] 2008-10-25
 * @param <T>
 */
public class PaginationSupport<T> {

	// Default page size
	public static final int PAGESIZE = 20;
	public static final int MENU_SIZE = 7;

	// total Rows
	private int totalRowsAmount;
	private int pageSize = PAGESIZE;
	private int totalPages;
	// current page number
	private int currentPage = 1;
	// next page number
	private int nextPage;
	// previous page number
	private int previousPage;
	// is has next page
	private boolean hasNext;
	// is has previous page
	private boolean hasPrevious;
	// current page start row number
	private int pageStartRow = 0;
	// current page end row number
	private int pageEndRow;
	private String[] pageMenuNum;
	private int menuSize = MENU_SIZE;
	// Pagination values
	@SuppressWarnings("unchecked")
	private List<T> items = Collections.EMPTY_LIST;
	// select detachedCriteria
	private CriteriaSpecification detachedCriteria;

	public PaginationSupport() {
	}

	/**
	 * 构造函数。
	 * 
	 * @param totalRows
	 *            总行数
	 * @param currentPage
	 *            当前页数
	 */
	public PaginationSupport(int totalRows, int currentPage) {
		setPaginationSupport(totalRows, currentPage);
	}

	/**
	 * general 构造函数。
	 * 
	 * @param totalRows
	 *            总行数
	 * @param currentPage
	 *            当前页数
	 * @param pageSize
	 *            每页显示数量。
	 */
	public PaginationSupport(int totalRows, int currentPage, int pageSize) {
		this.pageSize = pageSize;
		this.setPaginationSupport(totalRows, currentPage);
	}

	/**
	 * @param items
	 * @param totalCount
	 */
	public PaginationSupport(List<T> items, int totalCount) {
		setPageSize(PAGESIZE);
		setItems(items);
		int currentPage = 1;
		this.setPaginationSupport(totalCount, currentPage);
	}

	/**
	 * @param items
	 * @param totalCount
	 * @param startIndex
	 */
	public PaginationSupport(List<T> items, int totalCount, int startIndex) {
		setPageSize(PAGESIZE);
		setItems(items);
		int currentPage = (startIndex / pageSize) + 1;
		this.setPaginationSupport(totalCount, currentPage);
	}

	/**
	 * @param items
	 *            保存的目标List
	 * @param totalCount
	 *            查找的总行数
	 * @param pageSize
	 *            每页显示的行数
	 * @param startIndex
	 *            第几行开始
	 * 
	 */
	public PaginationSupport(List<T> items, int totalCount, int pageSize,
			int startIndex) {
		setPageSize(pageSize);
		setItems(items);

		int currentPage = (startIndex / pageSize) + 1;
		this.setPaginationSupport(totalCount, currentPage);
	}

	/**
	 * DetachedCriteria构造PS时的初始化方法。
	 * 
	 * @param items
	 *            保存的目标List
	 * @param totalCount
	 *            查找的总行数
	 * @param pageSize
	 *            每页显示的行数
	 * @param startIndex
	 *            第几行开始
	 * @param detachedCriteria
	 */
	public PaginationSupport(List<T> items, int totalCount, int pageSize,
			int startIndex, CriteriaSpecification detachedCriteria) {
		setPageSize(pageSize);
		setItems(items);
		int currentPage = (startIndex / pageSize) + 1;
		this.setPaginationSupport(totalCount, currentPage);
		setDetachedCriteria(detachedCriteria);
	}

	/**
	 * <p>
	 * 替换items，重新构造PaginationSupport对象。
	 * </p>
	 * 
	 * @param ps
	 * @param newItems
	 */
	public PaginationSupport(PaginationSupport<?> ps, List<T> newItems) {
		this(newItems, ps.getTotalRowsAmount(), ps.getPageSize(), ps
				.getPageStartRow());
	}

	public String[] getPageMenuNum() {
		return pageMenuNum;
	}

	public void setPageMenuNum(String[] pageMenuNum) {
		this.pageMenuNum = pageMenuNum;
	}

	public CriteriaSpecification getDetachedCriteria() {
		return detachedCriteria;
	}

	public void setDetachedCriteria(CriteriaSpecification detachedCriteria) {
		this.detachedCriteria = detachedCriteria;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

	public void setTotalPages(int totalPages) {
		this.totalPages = totalPages;
	}

	public void setNextPage(int nextPage) {
		this.nextPage = nextPage;
	}

	public void setPreviousPage(int previousPage) {
		this.previousPage = previousPage;
	}

	public void setHasNext(boolean hasNext) {
		this.hasNext = hasNext;
	}

	public void setHasPrevious(boolean hasPrevious) {
		this.hasPrevious = hasPrevious;
	}

	public void setPageStartRow(int pageStartRow) {
		this.pageStartRow = pageStartRow;
	}

	public List<T> getItems() {
		return items;
	}

	public void setItems(List<T> items) {
		this.items = items;
	}

	/**
	 * 分页导航按钮
	 * 
	 * @param currentPage
	 * @return
	 */
	private String[] getPageMenuNums(int currentPage) {
		String[] pageNums = null;

		if (totalPages > menuSize) {// 总页数大于导航显示的页数

			pageNums = new String[menuSize];

			int lastMenuNum = totalPages - menuSize + 1;// 最后一列导航栏按钮

			int beginMumNum = menuSize;

			int x = menuSize - 1;// 导航显示系数

			if ((currentPage < lastMenuNum) && (currentPage > beginMumNum)) {

				for (int i = 0; i < menuSize; i++) {
					pageNums[i] = String.valueOf(currentPage + i - x / 2);
				}

			} else if (currentPage > lastMenuNum) {
				for (int i = 0; i < menuSize; i++) {
					pageNums[i] = String.valueOf(lastMenuNum + i);
				}
			} else if (currentPage == lastMenuNum) {

				if ((lastMenuNum - x / 2) < 1) {
					lastMenuNum = x / 2 + 1;
				}

				for (int i = 0; i < menuSize; i++) {
					pageNums[i] = String.valueOf(lastMenuNum + i - x / 2);
				}

			} else if (currentPage == beginMumNum) {
				for (int i = 0; i < menuSize; i++) {
					pageNums[i] = String.valueOf(1 + i + x / 2);
				}
			} else {
				for (int i = 0; i < menuSize; i++) {
					pageNums[i] = String.valueOf(1 + i);
				}
			}

		} else {// 总页数小于等于导航显示的页数，直接显示。
			pageNums = new String[totalPages];

			// 分页数比总页数少
			for (int i = 0; i < totalPages; i++) {
				pageNums[i] = String.valueOf(i + 1);
			}
		}
		return pageNums;
	}

	/**
	 * 设置总行数。
	 * 
	 * @param rows
	 *            总行数。
	 */
	private void setTotalRowsAmount(int rows) {

		if (rows < 0) {
			totalRowsAmount = 0;
		} else {
			totalRowsAmount = rows;
		}

		if (totalRowsAmount % pageSize == 0) {
			totalPages = totalRowsAmount / pageSize;
		} else {
			totalPages = totalRowsAmount / pageSize + 1;
		}
	}

	/**
	 * 设置当前页数。
	 * 
	 * @param curPage
	 */
	private void setCurrentPage(int curPage) {

		if (curPage <= 0) {
			currentPage = 1;
		} else if (curPage > totalPages) {
			currentPage = totalPages;
		} else {
			currentPage = curPage;
		}

		if (currentPage > 1) {
			hasPrevious = true;
		} else {
			hasPrevious = false;
		}

		if (currentPage == totalPages) {
			hasNext = false;
		} else {
			hasNext = true;
		}

		if (totalPages != 0) {
			nextPage = currentPage + 1;
			previousPage = currentPage - 1;
			// 计算当前页开始行和结束行
			pageStartRow = (currentPage - 1) * pageSize + 1;
			// 记录索引从0开始
			pageStartRow -= 1;
			pageEndRow = pageStartRow + pageSize;
		}
	}

	public void setPaginationSupport(int totalRows, int currentPage) {
		// 获取总页码，通过对象总数还是每页多少行的关系
		setTotalRowsAmount(totalRows);
		setCurrentPage(currentPage);
		String[] pageNums = getPageMenuNums(currentPage);
		this.setPageMenuNum(pageNums);
	}

	public void setPageEndRow(int pageEndRow) {
		this.pageEndRow = pageEndRow;
	}

	public int getCurrentPage() {
		return currentPage;
	}

	public boolean isHasNext() {
		return hasNext;
	}

	public boolean isHasPrevious() {
		return hasPrevious;
	}

	public int getNextPage() {
		return nextPage;
	}

	public int getPageSize() {
		return pageSize;
	}

	public int getPreviousPage() {
		return previousPage;
	}

	public int getTotalPages() {
		return totalPages;
	}

	public int getTotalRowsAmount() {
		return totalRowsAmount;
	}

	public int getPageStartRow() {
		return pageStartRow;
	}

	public int getPageEndRow() {
		return pageEndRow;
	}

	public String description() {
		String description = "Total:" + this.getTotalRowsAmount() + " items "
				+ this.getTotalPages() + " pages,Current page:"
				+ this.currentPage + " Previous " + this.hasPrevious + " Next:"
				+ this.hasNext + " start row:" + this.pageStartRow
				+ " end row:" + this.pageEndRow;
		return description;
	}

	public void init() {
		// do some initialization work
	}

	public int getMenuSize() {
		return menuSize;
	}

	public void setMenuSize(int menuSize) {
		this.menuSize = menuSize;
	}
}

 

查询页面内容后，使用 public PaginationSupport(List items, int totalCount, int startIndex)  构造方法来构造PaginationSupport实例。


然后我的action对应 PaginationSupport实例名字为 pageController（注意实现getPageController方法）。


初始化分页url，因为在很多情况下，分页是带查询参数，所以先把基本的url参数填上。参考如下：

<s:url value="asrd.do" id="pageUrl" escapeAmp="not">
	<s:param name="beginStrDate" value="%{beginStrDate}"></s:param>
	<s:param name="endStrDate" value="%{endStrDate}"></s:param>
	<s:param name="timeCodeStr" value="%{timeCodeStr}"></s:param>
	<s:param name="preTypeName" value="%{preTypeName}"></s:param>
	<s:param name="firstDepId" value="%{firstDepId}"></s:param>
	<s:param name="secondDepId" value="%{secondDepId}"></s:param>
</s:url>

这里的url不能使用action来构造链接，因为后面需要添加参数到url中，而用action的话会造成项目名重复的问题。所以退而求次的只能使用value构造链接，但就必须填上action的后缀了。


然后是分页按钮的标签jsp

<%@ page language="java" pageEncoding="UTF-8"
	contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>

<!-- pagination menu begin by KennyLee 2011-6-2 -->

<s:if test="(pageController != null) and pageController.items.size gt 0">
	<div id="pagination_info">[ 共 ${pageController.totalRowsAmount}
		条记录 ]&nbsp;${pageController.currentPage}/${pageController.totalPages}
		页(每页显示 ${pageController.pageSize})</div>
	<div class="pagination">
		<s:if test="%{pageController.hasPrevious}">
			<s:url id="previousPageUrl" value="%{pageUrl}">
				<s:param name="toPage" value="%{pageController.previousPage}"></s:param>
			</s:url>
			<s:a href="%{previousPageUrl}">&lt;Prev</s:a>
		</s:if>
		<s:else>
			<span class="disabled">&lt;Prev</span>
		</s:else>
		<s:iterator value="%{pageController.pageMenuNum}" status="status"
			var="num">
			<s:if test="#status.index eq 0">
				<s:url id="firstPageUrl" value="%{pageUrl}">
					<s:param name="toPage" value="1"></s:param>
				</s:url>
				<s:if test="%{#num eq 2}">
					<s:a href="%{firstPageUrl}">1</s:a>
				</s:if>
				<s:if test="%{#num gt 2}">
					<s:a href="%{firstPageUrl}">1</s:a>
					<span>...</span>
				</s:if>
			</s:if>
			<s:if test="#num eq pageController.currentPage">
				<span class="current"> <s:property
						value="%{pageController.currentPage}" /> </span>
			</s:if>
			<s:else>
				<s:url id="listPageUrl" value="%{pageUrl}">
					<s:param name="toPage" value="%{num}"></s:param>
				</s:url>
				<s:a href="%{listPageUrl}">
					<s:property value="%{num}" />
				</s:a>
			</s:else>
			<s:if test="(pageController.menuSize - 1) eq #status.index ">
				<s:url id="lastPageUrl" value="%{pageUrl}">
					<s:param name="toPage" value="%{pageController.totalPages}"></s:param>
				</s:url>
				<s:if test="(pageController.menuSize - 1) eq #num">
					<s:a href="%{lastPageUrl}">
						<s:property value="%{pageController.totalPages}" />
					</s:a>
				</s:if>
				<s:if test="#num lt (pageController.totalPages-1)">
					<span>...</span>
					<s:a href="%{lastPageUrl}">
						<s:property value="%{pageController.totalPages}" />
					</s:a>
				</s:if>
			</s:if>
		</s:iterator>
		<s:if test="pageController.hasNext">
			<s:url id="nextPageUrl" value="%{pageUrl}">
				<s:param name="toPage" value="%{pageController.nextPage}"></s:param>
			</s:url>
			<s:a href="%{nextPageUrl}">Next&gt;</s:a>
		</s:if>
		<s:else>
			<span class="disabled">Next&gt;</span>
		</s:else>
	</div>
	<!-- pagination menu end -->
</s:if>

按钮样式

/******************** page start **************************/

div.pagination {
	padding-right: 3px;
	padding-left: 3px;
	padding-bottom: 3px;
	margin: 3px;
	padding-top: 3px;
	text-align: center;
}

div.pagination a {
	border-right: #dedfde 1px solid;
	padding-right: 6px;
	background-position: 50% bottom;
	border-top: #dedfde 1px solid;
	padding-left: 6px;
	padding-bottom: 2px;
	border-left: #dedfde 1px solid;
	color: #0061de;
	margin-right: 3px;
	padding-top: 2px;
	border-bottom: #dedfde 1px solid;
	text-decoration: none
}

div.pagination a:hover {
	border-right: #000 1px solid;
	border-top: #000 1px solid;
	background-image: none;
	border-left: #000 1px solid;
	color: #fff;
	border-bottom: #000 1px solid;
	background-color: #0061de
}

div.pagination a:active {
	border-right: #000 1px solid;
	border-top: #000 1px solid;
	background-image: none;
	border-left: #000 1px solid;
	color: #fff;
	border-bottom: #000 1px solid;
	background-color: #0061de
}

div.pagination span.current {
	padding-right: 6px;
	padding-left: 6px;
	font-weight: bold;
	padding-bottom: 2px;
	color: #ff0084;
	margin-right: 3px;
	padding-top: 2px
}

div.pagination span.disabled {
	padding-right: 6px;
	padding-left: 6px;
	padding-bottom: 2px;
	color: #adaaad;
	margin-right: 3px;
	padding-top: 2px
}

div#pagination_info {
	text-align: center;
}

/****end***/

最后效果如下：