JAVA List集合转Page（分页对象） java 分页 PageModel 测试类TestPagerModel

青旅半醒 2023-07-12 14:25 12阅读 0赞

[http://www.blogjava.net/jzone/archive/2015/06/05/308842.html?opt=admin][http_www.blogjava.net_jzone_archive_2015_06_05_308842.html_opt_admin]

`/**`

` ``* @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));  
        \}  
    \}

上面的在项目中使用了

在java中实现list分页  
原创墨咖 最后发布于2019-06-29 17:12:54 阅读数 162  收藏  
展开  
        ArrayList list = new ArrayList();  
        list.add("name");  
        list.add("age");  
        list.add(16);  
        list.add("name1");  
        list.add("age1");  
        list.add(161);  
        list.add("name2");  
        list.add("age2");  
        list.add(162);  
        System.out.println("分页参数：0,3--:"+list.subList(0,3));  
        System.out.println("分页参数：3,6--:"+list.subList(3,6));  
        System.out.println("分页参数：6,9--:"+list.subList(6,9));  
   
————————————————  
版权声明：本文为CSDN博主「墨咖」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。  
原文链接：https://blog.csdn.net/qq\_37335810/article/details/94177407

`/**`

` ``* java内存分页工具类`

` ``*/`

`public` `class` `JavaMemoryPageUtil {`

` `

`  ``/**`

`   ``* 获取分页数据`

`   ``* @param dataList 进行分页的数据集合`

`   ``* @param pageNum  第几页`

`   ``* @param pageSize 每页显示多少条`

`   ``* @return`

`   ``*/`