JAVA中List集合分页
package com.brit.os.util;import java.util.ArrayList;import java.util.List;/** * 通用分页工具类，该工具类分页指定泛型的List对集合 * * @author evan * @time 2010-01-12 * @param <E> * 指定的泛型 */public class Page<E>{/** * 每页显示的记录数 */private int pageRecords = 20;/** * 总记录数 */private int totalRecord;/** * 分页切割的启始点 */private int startIndex;/** * 分页切割的结束点 */private int endIndex;/** * 总页数 */private int totalPage;/** * 当前页数 */private int currentPage = 1;/** * 总记录集合 */private List<E> totalList;public Page(List<E> totalList){super();this.totalList = totalList;innit();}/** * 初始化该分页对象 */private void innit(){if (null != totalList){totalRecord = totalList.size();if (totalRecord % this.pageRecords == 0){this.totalPage = totalRecord / this.pageRecords;}else{this.totalPage = totalRecord / this.pageRecords + 1;}}}/** * 得到分页后的数据 * * @return 分页数据 */public List<E> getPage(int currentPage){this.currentPage = currentPage;if (currentPage <= 0){this.currentPage = 1;}if (currentPage >= this.totalPage){this.currentPage = this.totalPage;}List<E> subList = new ArrayList<E>();if (null != this.totalList){subList.addAll(this.totalList.subList(getStartIndex(), getEndIndex()));}return subList;}/** * 设置每页显示的记录条数,如果不设置则默认为每页显示30条记录 * * @param pageRecords * 每页显示的记录条数(值必需介于10~100之间) */public void setPageRecords(int pageRecords){if (pageRecords >= 10 && pageRecords <= 100){this.pageRecords = pageRecords;innit();}}public int getStartIndex(){if (null == this.totalList){return 0;}this.startIndex = (getCurrentPage() - 1) * this.pageRecords;if (startIndex > totalRecord){startIndex = totalRecord;}if (startIndex < 0){startIndex = 0;}return startIndex;}public int getEndIndex(){if (null == this.totalList){return 0;}endIndex = getStartIndex() + this.pageRecords;if (endIndex < 0){endIndex = 0;}if (endIndex < getStartIndex()){endIndex = getStartIndex();}if (endIndex > this.totalRecord){endIndex = this.totalRecord;}return endIndex;}/*** * 获取总页数 * @return */public int getTotalPage(){return totalPage;}/** * 获取List集合中的总条数 * @return */public int getTotalRecord(){return totalRecord;}public boolean isEndPage(){return this.currentPage == this.totalPage;}/** * 获取下一页的页数 * * @return 下一页的页数 */public int getNextPage(){int nextPage = this.currentPage + 1;if (nextPage > this.totalPage){nextPage = this.totalPage;}if (nextPage <= 0){nextPage = 1;}return nextPage;}/** * 获取上一页的页数 * * @return 上一页的页数 */public int getPrivyPage(){int privyPage = this.currentPage - 1;if (privyPage > this.totalPage){privyPage = this.totalPage;}if (privyPage <= 0){privyPage = 1;}return privyPage;}/** * 获取当前页页数 * @return */public int getCurrentPage(){return currentPage;}}?