/** * @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; } }
测试类TestPagerModel
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)); } } }