/*** @version 1.0* @author: fwjia*/
import java.util.List;public class PageModel<T> {/**** 当前页*/private int page = 1;/**** 总页数*/public int totalPages = 0;/**** 每页数据条数*/private int pageRecorders;/**** 总页数*/private int totalRows = 0;/**** 每页的起始数*/private int pageStartRow = 0;/**** 每页显示数据的终止数*/private int pageEndRow = 0;/**** 是否有下一页*/private boolean hasNextPage = false;/**** 是否有前一页*/private boolean hasPreviousPage = false;/**** 数据集合*/private List<T> list;public PageModel(List<T> list, int pageRecorders) {// 通过对象集，记录总数划分init(list, pageRecorders);}/** *//*** 初始化list，并告之该list每页的记录数* @param list 数据几个* @param pageRecorders 一页显示多少数据*/public void init(List<T> list, int pageRecorders) {this.pageRecorders = pageRecorders;this.list = list;totalRows = list.size();hasPreviousPage = false;if ((totalRows % pageRecorders) == 0) {totalPages = totalRows / pageRecorders;} else {totalPages = totalRows / pageRecorders + 1;}if (page >= totalPages) {hasNextPage = false;} else {hasNextPage = true;}if (totalRows < pageRecorders) {this.pageStartRow = 0;this.pageEndRow = totalRows;} else {this.pageStartRow = 0;this.pageEndRow = pageRecorders;}}// 判断要不要分页public boolean isNext() {return list.size() > 5;}public void setHasPreviousPage(boolean hasPreviousPage) {this.hasPreviousPage = hasPreviousPage;}public String toString(int temp) {String str = Integer.toString(temp);return str;}public void description() {String description = "共有数据数:" + this.getTotalRows() +"共有页数: " + this.getTotalPages() +"当前页数为:" + this.getPage() +" 是否有前一页: " + this.isHasPreviousPage() +" 是否有下一页:" + this.isHasNextPage() +" 开始行数:" + this.getPageStartRow() +" 终止行数:" + this.getPageEndRow();System.out.println(description);}public List getNextPage() {page = page + 1;disposePage();System.out.println("用户凋用的是第" + page + "页");this.description();return getObjects(page);}/*** 处理分页*/private void disposePage() {if (page == 0) {page = 1;}if ((page - 1) > 0) {hasPreviousPage = true;} else {hasPreviousPage = false;}if (page >= totalPages) {hasNextPage = false;} else {hasNextPage = true;}}public List getPreviousPage() {page = page - 1;if ((page - 1) > 0) {hasPreviousPage = true;} else {hasPreviousPage = false;}if (page >= totalPages) {hasNextPage = false;} else {hasNextPage = true;}this.description();return getObjects(page);}/*** 获取第几页的内容** @param page 当前页面* @return*/public List<T> getObjects(int page) {if(page == 0){this.setPage(1);}else{this.setPage(page);}this.disposePage();if (page * pageRecorders < totalRows) {// 判断是否为最后一页pageEndRow = page * pageRecorders;pageStartRow = pageEndRow - pageRecorders;} else {pageEndRow = totalRows;pageStartRow = pageRecorders * (totalPages - 1);}List<T> objects = null;if (!list.isEmpty()) {objects = list.subList(pageStartRow, pageEndRow);}//this.description();return objects;}public List<T> getFistPage() {if (this.isNext()) {return list.subList(0, pageRecorders);} else {return list;}}public boolean isHasNextPage() {return hasNextPage;}public void setHasNextPage(boolean hasNextPage) {this.hasNextPage = hasNextPage;}public List getList() {return list;}public void setList(List list) {this.list = list;}public int getPage() {return page;}public void setPage(int page) {this.page = page;}public int getPageEndRow() {return pageEndRow;}public void setPageEndRow(int pageEndRow) {this.pageEndRow = pageEndRow;}public int getPageRecorders() {return pageRecorders;}public void setPageRecorders(int pageRecorders) {this.pageRecorders = pageRecorders;}public int getPageStartRow() {return pageStartRow;}public void setPageStartRow(int pageStartRow) {this.pageStartRow = pageStartRow;}public int getTotalPages() {return totalPages;}public void setTotalPages(int totalPages) {this.totalPages = totalPages;}public int getTotalRows() {return totalRows;}public void setTotalRows(int totalRows) {this.totalRows = totalRows;}public boolean isHasPreviousPage() {return hasPreviousPage;}}

import java.util.ArrayList;
import java.util.List;/*** @version 1.0* @author: fwjia*/
public class TestPagerModel {public static void main(String args[]) {List<String> list = new ArrayList<String>();list.add("a");list.add("b");list.add("c");list.add("d");list.add("e");list.add("f");list.add("g");list.add("h");list.add("h");list.add("i");list.add("j");list.add("k");list.add("l");list.add("m");PageModel<String> pm = new PageModel(list, 5);List<String> sublist = pm.getObjects(2);for(int i = 0; i < sublist.size(); i++) {System.out.println(sublist.get(i));}}}