java中利用List的subList方法实现对List分页（简单易学）

java中利用List的subList方法实现对List分页（简单易学）

以下是介绍利用List的subList方法实现对List分页，废话不多说了，直接看代码把

/** *//**

* 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 totalRohttp://ws = 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));

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。