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/** *//**
* List分页
* 实现：利用List的获取子List方法，实现对List的分页
* @author 显武
* @date 2010-1-8 16:27:31
*
*/
import java.util.ArrayList;
import java.util.List;
public class PageModel {
private int page = 1; // 当前页
public int totalPages = 0; // 总页数
private int pageRecorders;// 每页5条数据
private int totalRows = 0; // 总数据数
private int pageStartRow = 0;// 每页的起始数
private int pageEndRow = 0; // 每页显示数据的终止数
private boolean hasNextPage = false; // 是否有下一页
private boolean hasPreviousPage = false; // 是否有前一页
private List list;
// private Iterator it;
public PageModel(List list, int pageRecorders) {
init(list, pageRecorders);// 通过对象集，记录总数划分
}
/** *//**
* 初始化list，并告之该list每页的记录数
* @param list
* @param pageRecorders
*/
public void init(List list, int pageRecorders) {
this.pageRecorders = pageRecorders;
this.list = list;
totalRows = list.size();
// it = list.iterator();
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
* @return
*/
public List 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 objects = null;
if (!list.isEmpty()) {
objects = list.subList(pageStartRow, pageEndRow);
}
//this.description();
return objects;
}
public List 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：
package com.Gavin.tools.util;
import java.util.ArrayList;
import java.util.List;
public class TestPagerModel {
public static void main(String args[]) {
List list = new ArrayList();
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 pm = new PageModel(list, 5);
List sublist = pm.getObjects(3);
for(int i = 0; i < sublist.size(); i++) {
System.out.println(sublist.get(i));
}
System.out.println(sublist.get(0));
}
}
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