分页 Page 类

 
package ssh.core.orm;

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

import org.apache.commons.lang.StringUtils;

import com.google.common.collect.Lists;
public class Page<T> {
	//-- 公共变量 --//
	public static final String ASC = "asc";
	public static final String DESC = "desc";

	//-- 分页参数 --//
	protected int pageNo = 1;
	protected int pageSize = 1;
	protected String orderBy = null;
	protected String order = null;
	protected boolean autoCount = true;
	 

	//-- 返回结果 --//
	protected List<T> result = Lists.newArrayList();
	protected long totalCount = -1;

    private List list = new ArrayList(0);  //存放数据   
    private int barNumbers = 10; //几个为一条，默认为10  
    private List listNumbers = new ArrayList(); //数字翻页条   
    
    
	//-- 构造函数 --//
	public Page() {
	}

	public Page(int pageSize) {
		this.pageSize = pageSize;
	}

	//-- 访问查询参数函数 --//
	/**
	 * 获得当前页的页号,序号从1开始,默认为1.
	 */
	public int getPageNo() {
		return pageNo;
	}

	/**
	 * 设置当前页的页号,序号从1开始,低于1时自动调整为1.
	 */
	public void setPageNo(final int pageNo) {
		this.pageNo = pageNo;

		if (pageNo < 1) {
			this.pageNo = 1;
		}
	}

	public Page<T> pageNo(final int thePageNo) {
		setPageNo(thePageNo);
		return this;
	}

	/**
	 * 获得每页的记录数量,默认为1.
	 */
	public int getPageSize() {
		return pageSize;
	}

	/**
	 * 设置每页的记录数量,低于1时自动调整为1.
	 */
	public void setPageSize(final int pageSize) {
		this.pageSize = pageSize;

		if (pageSize < 1) {
			this.pageSize = 1;
		}
	}

	public Page<T> pageSize(final int thePageSize) {
		setPageSize(thePageSize);
		return this;
	}

	/**
	 * 根据pageNo和pageSize计算当前页第一条记录在总结果集中的位置,序号从1开始.
	 */
	public int getFirst() {
		return ((pageNo - 1) * pageSize) + 1;
	}

	/**
	 * 获得排序字段,无默认值.多个排序字段时用","分隔.
	 */
	public String getOrderBy() {
		return orderBy;
	}

	/**
	 * 设置排序字段,多个排序字段时用","分隔.
	 */
	public void setOrderBy(final String orderBy) {
		this.orderBy = orderBy;
	}

	public Page<T> orderBy(final String theOrderBy) {
		setOrderBy(theOrderBy);
		return this;
	}

	/**
	 * 获得排序方向.
	 */
	public String getOrder() {
		return order;
	}

	/**
	 * 设置排序方式向.
	 * 
	 * @param order 可选值为desc或asc,多个排序字段时用","分隔.
	 */
	public void setOrder(final String order) {
		//检查order字符串的合法值
		String[] orders = StringUtils.split(StringUtils.lowerCase(order), ",");
		for (String orderStr : orders) {
			if (!StringUtils.equals(DESC, orderStr) && !StringUtils.equals(ASC, orderStr)) {
				throw new IllegalArgumentException("排序方向" + orderStr + "不是合法值");
			}
		}

		this.order = StringUtils.lowerCase(order);
	}

	public Page<T> order(final String theOrder) {
		setOrder(theOrder);
		return this;
	}

	/**
	 * 是否已设置排序字段,无默认值.
	 */
	public boolean isOrderBySetted() {
		return (StringUtils.isNotBlank(orderBy) && StringUtils.isNotBlank(order));
	}

	/**
	 * 查询对象时是否自动另外执行count查询获取总记录数, 默认为false.
	 */
	public boolean isAutoCount() {
		return autoCount;
	}

	/**
	 * 查询对象时是否自动另外执行count查询获取总记录数.
	 */
	public void setAutoCount(final boolean autoCount) {
		this.autoCount = autoCount;
	}

	public Page<T> autoCount(final boolean theAutoCount) {
		setAutoCount(theAutoCount);
		return this;
	}

	//-- 访问查询结果函数 --//

	/**
	 * 取得页内的记录列表.
	 */
	public List<T> getResult() {
		return result;
	}

	/**
	 * 设置页内的记录列表.
	 */
	public void setResult(final List<T> result) {
		this.result = result;
	}

	/**
	 * 取得总记录数, 默认值为-1.
	 */
	public long getTotalCount() {
		return totalCount;
	}

	/**
	 * 设置总记录数.
	 */
	public void setTotalCount(final long totalCount) {
		this.totalCount = totalCount;
	}

	/**
	 * 根据pageSize与totalCount计算总页数, 默认值为-1.
	 */
	public long getTotalPages() {
		if (totalCount < 0) {
			return -1;
		}

		long count = totalCount / pageSize;
		if (totalCount % pageSize > 0) {
			count++;
		}
		return count;
	}

	/**
	 * 是否还有下一页.
	 */
	public boolean isHasNext() {
		return (pageNo +1 <= getTotalPages());
	}

	/**
	 * 取得下页的页号, 序号从1开始.
	 * 当前页为尾页时仍返回尾页序号.
	 */
	public int getNextPage() {
		if (isHasNext()) {
			return pageNo + 1;
		} else {
			return pageNo;
		}
	}

	/**
	 * 是否还有上一页.
	 */
	public boolean isHasPre() {
		return (pageNo - 1 >= 1);
	}

	/**
	 * 取得上页的页号, 序号从1开始.
	 * 当前页为首页时返回首页序号.
	 */
	public int getPrePage() {
		if (isHasPre()) {
			return pageNo - 1;
		} else {
			return 1;
		}
	}
	 
	
	
	      
	   

	    
	    /**
		 * 计算开始页和结束页
		 * 
		 * @param barNumbers 页面中要显示的页面个数
		 * @param pageNo  当前页
		 * @param totalPages 总页面数
		 * @return PageIndex 记录开始页（startindex）和结束页（endindex）
		 */
	    public List  getListNumbers( ) {
	    	 List listn = new ArrayList();  
	    	 int totalPages = Integer.valueOf(String.valueOf(this.getTotalPages()));
			int startpage = pageNo - (barNumbers % 2 == 0 ? barNumbers / 2 - 1: barNumbers / 2);
			int endpage = pageNo + barNumbers / 2;
			if (startpage < 1) {
				startpage = 1;
				if (totalPages >= barNumbers)
					endpage = barNumbers;
				else
					endpage = totalPages;
			}
			if (endpage > totalPages) {
				endpage = totalPages;
				if ((endpage - barNumbers) > 0)
					startpage = endpage - barNumbers + 1;
				else
					startpage = 1;
			}
			for (int i = startpage; i <= endpage; i++) {
				 listn.add(i); 
			}
			return   listn ;
		}
	    
	    public void setListNumbers(List listNumbers) {
			this.listNumbers = listNumbers;
		}

		public List getList() {  
	        return list;  
	    }  
	    public void setList(List list) {  
	        this.list = list;  
	    }  
	    public int getBarNumbers() {  
	        return barNumbers;  
	    }  
	    public void setBarNumbers(int barNumbers) {  
	        this.barNumbers = barNumbers;  
	    }  
}

页面中使用

<div class="digg" > 
			    <a href="javascript:jumpPage(1)" style="padding-top:4px; margin-bottom:2px; margin:-3px;">首页</a>
			    <s:if test="page.hasPre">
			   		 <a href="javascript:jumpPage(${page.prePage})"><</a>
			    </s:if>
			    
			    <s:iterator value = "page.listNumbers" var="stau"  > 
		          <s:if test="#stau==page.pageNo">
			       <span  class = "current"> <s:property /></span> 
			     </s:if>
			     <s:else>
			       <span> <a href="javascript:jumpPage(<s:property />)"><s:property /></a></span> 
			     </s:else>
				</s:iterator>
				
				<s:if test="page.hasNext">
					<a href="javascript:jumpPage(${page.nextPage})">></a>
				</s:if>
				<a href="javascript:jumpPage(${page.totalPages})" style="padding-top:4px; margin-bottom:2px;">末页</a>   
</div>

css

DIV.digg {
 PADDING-RIGHT: 3px; PADDING-LEFT: 3px; PADDING-BOTTOM: 3px; MARGIN: 3px; PADDING-TOP: 3px; TEXT-ALIGN: center
}
DIV.digg A {
 BORDER-RIGHT: #aaaadd 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #aaaadd 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #aaaadd 1px solid; COLOR: #000099; PADDING-TOP: 2px; BORDER-BOTTOM: #aaaadd 1px solid; TEXT-DECORATION: none
}
DIV.digg A:hover {
 BORDER-RIGHT: #000099 1px solid; BORDER-TOP: #000099 1px solid; BORDER-LEFT: #000099 1px solid; COLOR: #000; BORDER-BOTTOM: #000099 1px solid
}
DIV.digg A:active {
 BORDER-RIGHT: #000099 1px solid; BORDER-TOP: #000099 1px solid; BORDER-LEFT: #000099 1px solid; COLOR: #000; BORDER-BOTTOM: #000099 1px solid
}
DIV.digg SPAN.current {
 BORDER-RIGHT: #000099 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #000099 1px solid; PADDING-LEFT: 5px; FONT-WEIGHT: bold; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #000099 1px solid; COLOR: #fff; PADDING-TOP: 2px; BORDER-BOTTOM: #000099 1px solid; BACKGROUND-COLOR: #000099
}
DIV.digg SPAN.disabled {
 BORDER-RIGHT: #eee 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #eee 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 2px; MARGIN: 2px; BORDER-LEFT: #eee 1px solid; COLOR: #ddd; PADDING-TOP: 2px; BORDER-BOTTOM: #eee 1px solid; 
}

显示效果