分页

来源：互联网发布：java毕业论文开题报告编辑：程序博客网时间：2024/06/09 13:44

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

[plain] view plaincopy

<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

[css] view plaincopy

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

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