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　　bootstrap是前端很流行的框架，正在开发的项目，用bootstrap搭建起来的页面，自我感觉很完美，终于告别了苍白无力的白花花的难看的……的页面了。哈哈。

现在遇到了bootstrap的分页与Java后台结合起来的分页封装问题，对于我这个Java菜鸟来说，包装分页还没玩过。故此，在网上找了这个。觉得很不错，所以决定记录到博客里面。

还没有实践，决定写完博客去实践。在上图。祝我成功吧！

此人的博客没找到，代码中有email地址。

pagination

定义了分页常用的属性,方法

package com.app.pagination;import java.util.List;/** * 通用分页接口 * @author: super.wwz@hotmail.com * @ClassName: Pagination * @Version: v0.1 * @param <T> */ public interface Pagination<T> { /** * 判断是否是首页 * @return */ boolean isFirst(); /** * 判断是否是尾页 * @return */ boolean isLast(); /** * 判断是否有上一页 * @return */ boolean isPrevious(); /** * 判断是否有下一页 * @return */ boolean isNext(); /** * 获取上一页的页码 * @return */ int getPreviousIndex(); /** * 获取下一页的页码 * @return */ int getNextIndex(); /** * 获取当前页码 * @return */ int getPageIndex(); /** * 获取当前页大小 * @return */ int getPageSize(); /** * 获取总页数 * @return */ int getTotalPages(); /** * 获取数据总行数 * @return */ int getTotalElements(); /** * 获取当前页的数据 * @return */ List<T> getCurrData(); /** * 获取数字分页链接对象 * @return */ BetweenIndex getBetweenIndex(); /** * 获取每页显示的分页链接数 * @return */ int getPageLinkNumber(); /** * 设置每页的分页链接数量 * @param pageLinkNumber */ void setPageLinkNumber(int pageLinkNumber);}

BetweenIndex

该接口负责获取分页链接的开始和结尾索引

package com.app.pagination;/** * 开始链接-结束链接 * @author: super.wwz@hotmail.com * @ClassName: BetweenIndex * @Version: v0.1 */public interface BetweenIndex { /** * 获取开始分页链接索引 * @return */ int getBeginIndex(); /** * 获取结束分页链接索引 * @return */ int getEndIndex();}

DefaultPagination

Pagination接口的默认实现类

package com.app.pagination.impl;import java.util.List;import com.app.pagination.BetweenIndex;import com.app.pagination.Pagination;/** * Pagination接口默认实现 * @author: super.wwz@hotmail.com * @ClassName: DefaultPagination * @Version: v0.1 * @param <T> */public class DefaultPagination<T> implements Pagination<T> { private int totalElements; private int pageSize; private int totalPages; private int pageIndex; private QueryHandler<T> queryHandler; private List<T> currData; private int pageLinkNumber; public DefaultPagination(int pageIndex, int pageSize, QueryHandler<T> queryHandler, int pageLinkNumber) { this(pageIndex, pageSize, queryHandler); setPageLinkNumber(pageLinkNumber); } public DefaultPagination(int pageIndex, int pageSize, QueryHandler<T> queryHandler){ //初始化数据访问回调接口 this.queryHandler = queryHandler; //查询总行数 setTotalElements(); //修正页大小 setPageSize(pageSize); //计算总页数: setTotalPages(); //修正页码 setPageIndex(pageIndex); //查询当前页数据 setCurrData(); } private void setCurrData() { // TODO Auto-generated method stub this.currData = queryHandler.getCurrData(pageIndex, pageSize); } private void setPageIndex(int pageIndex) { // TODO Auto-generated method stub if(pageIndex < 1) { this.pageIndex = 1; } else if(pageIndex > totalPages) { this.pageIndex = totalPages; } else { this.pageIndex = pageIndex; } } private void setTotalPages() { // TODO Auto-generated method stub if(pageSize > 0) { //减一公式: this.totalPages = (totalElements + pageSize - 1) / pageSize; } } private void setPageSize(int pageSize) { // TODO Auto-generated method stub if(pageSize < 1) { this.pageSize = 1; } else if(pageSize > totalElements) { this.pageSize = totalElements; } else { this.pageSize = pageSize; } } private void setTotalElements() { // TODO Auto-generated method stub this.totalElements = queryHandler.getTotalElements(); } @Override public boolean isFirst() { // TODO Auto-generated method stub return pageIndex == 1; } @Override public boolean isLast() { // TODO Auto-generated method stub return pageIndex == totalPages; } @Override public boolean isPrevious() { // TODO Auto-generated method stub return pageIndex > 1; } @Override public boolean isNext() { // TODO Auto-generated method stub return pageIndex < totalPages; } @Override public int getPreviousIndex() { // TODO Auto-generated method stub return isPrevious() ? pageIndex - 1 : 1; } @Override public int getNextIndex() { // TODO Auto-generated method stub return isNext() ? pageIndex + 1 : totalPages; } @Override public int getPageIndex() { // TODO Auto-generated method stub return pageIndex; } @Override public int getPageSize() { // TODO Auto-generated method stub return pageSize; } @Override public int getTotalPages() { // TODO Auto-generated method stub return totalPages; } @Override public int getTotalElements() { // TODO Auto-generated method stub return totalElements; } @Override public List<T> getCurrData() { // TODO Auto-generated method stub return currData; } @Override public BetweenIndex getBetweenIndex() { // TODO Auto-generated method stub return new BetweenIndex() { private int beginIndex; private int endIndex; { boolean isOdd = pageLinkNumber % 2 == 0; int val = pageLinkNumber / 2; beginIndex = pageIndex - (isOdd ? val - 1: val); endIndex = pageIndex + val; if(beginIndex < 1) { beginIndex = 1; endIndex = pageLinkNumber; } if(endIndex > totalPages) { endIndex = totalPages; beginIndex = endIndex - pageLinkNumber + 1; } } @Override public int getEndIndex() { // TODO Auto-generated method stub return endIndex; } @Override public int getBeginIndex() { // TODO Auto-generated method stub return beginIndex; } }; } @Override public int getPageLinkNumber() { // TODO Auto-generated method stub return pageLinkNumber; } @Override public void setPageLinkNumber(int pageLinkNumber) { // TODO Auto-generated method stub if (pageLinkNumber < 0) { this.pageLinkNumber = 0; } else if (pageLinkNumber > totalPages) { this.pageLinkNumber = totalPages; } else { this.pageLinkNumber = pageLinkNumber; } }}　

QueryHandler

用于DefaultPagination实现类的查询回调接口

package com.app.pagination.impl;import java.util.List;/** * 分页查询回调接口 * @author: super.wwz@hotmail.com * @ClassName: QueryHandler * @Version: v0.1 * @param <T> */public interface QueryHandler<T> { /** * 获取数据总行数 * @return */ int getTotalElements(); /** * 获取当前页的数据 * @param pageIndex * @param pageSize * @return */ List<T> getCurrData(int pageIndex, int pageSize);}

BookDaoImpl

BookDao的实现类(BookDao接口已经省略)

package com.app.dao.impl;import java.sql.SQLException;import java.util.List;import org.apache.commons.dbutils.handlers.BeanListHandler;import org.apache.commons.dbutils.handlers.ScalarHandler;import com.app.bean.Book;import com.app.dao.BaseDao;import com.app.dao.BookDao;public class BookDaoImpl extends BaseDao implements BookDao { @Override public int count() { // 查询数据总行数 String sql = "select count(1) from t_book"; try { return getQueryRunner().query(sql, new ScalarHandler<Integer>()); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return 0; } @Override public List<Book> getBooks(int pageIndex, int pageSize) { // 关于SQLServer的查询分页sql StringBuffer sql = new StringBuffer(); sql.append("select * from ("); sql.append(" select row_number() over(order by(id)) new_id,* from t_book"); sql.append(") t where new_id between ? and ?"); try { return getQueryRunner().query(sql.toString(), new BeanListHandler<Book>(Book.class), pageSize * (pageIndex - 1) + 1,pageSize * pageIndex); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }}

BookServiceImpl

BookService业务逻辑接口的实现类 (BookService已经省略)

package com.app.service.impl;import java.util.List;import com.app.bean.Book;import com.app.dao.BookDao;import com.app.dao.impl.BookDaoImpl;import com.app.pagination.Pagination;import com.app.pagination.impl.DefaultPagination;import com.app.pagination.impl.QueryHandler;import com.app.service.BookService;/** * 业务逻辑层查询分页数据示例 * @author: super.wwz@hotmail.com * @ClassName: BookServiceImpl * @Version: v0.1 */public class BookServiceImpl implements BookService { private BookDao bookDao = new BookDaoImpl(); @Override public Pagination<Book> getBookList(int pageIndex, int pageSize,int pageLinkNumber) { // TODO Auto-generated method stub return new DefaultPagination<Book>(pageIndex, pageSize, new QueryHandler<Book>() { @Override public int getTotalElements() { // TODO Auto-generated method stub return bookDao.count(); } @Override public List<Book> getCurrData(int pageIndex, int pageSize) { // TODO Auto-generated method stub return bookDao.getBooks(pageIndex, pageSize); } },pageLinkNumber); }}

BookAction

有关图书的Servlet控制器

package com.app.web.action;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.app.bean.Book;import com.app.pagination.Pagination;import com.app.service.BookService;import com.app.service.impl.BookServiceImpl;public class BookAction extends HttpServlet { private static final long serialVersionUID = 5275929408058702210L; private BookService bookService = new BookServiceImpl(); @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); int pageIndex = 1; int pageSize = 10; try { pageIndex = Integer.parseInt(request.getParameter("pageIndex")); pageSize = Integer.parseInt(request.getParameter("pageSize")); } catch (NumberFormatException e) { e.printStackTrace(); } //6: 显示的分页链接个数 Pagination<Book> bookPagination = bookService.getBookList(pageIndex, pageSize,6); request.setAttribute("bookPagination", bookPagination); request.getRequestDispatcher("index.jsp").forward(request, response); }}

Jsp

index.jsp
将Pagiation应用到bootstrap上的简单示例bootstrap版本: 3.3.5

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><c:if test="${requestScope.bookPagination == null }"> <c:redirect url="bookAction?pageIndex=1&pageSize=4"></c:redirect></c:if><!DOCTYPE html"><html> <head> <title>图书信息列表</title> <!-- Bootstrap v3.3.5 --><link href="${pageContext.request.contextPath}/bootstrap-3.3.5-dist/css/bootstrap.min.css" type="text/css" rel="stylesheet" charset="utf-8" /><link id="bootstrapTheme" href="${pageContext.request.contextPath}/bootstrap-3.3.5-dist/css/bootstrap-theme.min.css" type="text/css" rel="stylesheet" charset="utf-8" /><script src="${pageContext.request.contextPath}/bootstrap-3.3.5-dist/js/jquery.min.js" type="text/javascript" charset="utf-8"></script><script src="${pageContext.request.contextPath}/bootstrap-3.3.5-dist/js/bootstrap.min.js" type="text/javascript" charset="utf-8"></script> </head> <body> <div class="container"> <h2 class="page-header">图书信息</h2> <table class="table table-striped table-bordered table-hover"> <tr> <th>#</th> <th>图书名</th> <th>单价</th> </tr> <c:set var="bookPagination" value="${requestScope.bookPagination}"></c:set> <c:choose> <c:when test="${bookPagination.totalElements gt 0}"> <c:forEach var="book" items="${bookPagination.currData}"> <tr> <td>${book.id }</td> <td>${book.name }</td> <td>${book.price }</td> </tr> </c:forEach> <td colspan="3" align="center"> <div class="btn-group" role="group"> <c:if test="${bookPagination.first}" var="isFirst"> <a class="btn btn-primary btn-sm" disabled="disabled" href="#">首页</a> <a class="btn btn-success btn-sm" disabled="disabled" href="#">上一页</a> </c:if> <c:if test="${not isFirst}"> <a class="btn btn-primary btn-sm" href="${pageContext.request.contextPath}/bookAction?pageIndex=1&pageSize=${bookPagination.pageSize}">首页</a> <a class="btn btn-success btn-sm" href="${pageContext.request.contextPath}/bookAction?pageIndex=${bookPagination.previousIndex }&pageSize=${bookPagination.pageSize}">上一页</a> </c:if> <c:if test="${bookPagination.last }" var="isLast"> <a class="btn btn-success btn-sm" disabled="disabled" href="#">下一页</a> <a class="btn btn-primary btn-sm" disabled="disabled" href="#">尾页</a> </c:if> <c:if test="${not isLast}"> <a class="btn btn-success btn-sm" href="${pageContext.request.contextPath}/bookAction?pageIndex=${bookPagination.nextIndex }&pageSize=${bookPagination.pageSize}">下一页</a> <a class="btn btn-primary btn-sm" href="${pageContext.request.contextPath}/bookAction?pageIndex=${bookPagination.totalPages }&pageSize=${bookPagination.pageSize}">尾页</a> </c:if> </div> </td> </c:when> <c:otherwise> <tr><td colspan="3">没有更多数据!</td></tr> </c:otherwise> </c:choose> </table> <center> <nav> <ul class="pagination"> <c:if test="${isFirst }"> <li class="disabled"> <a href="#" aria-label="Previous"> <span aria-hidden="true">»上一页</span> </a> </li> </c:if> <c:if test="${not isFirst }"> <li> <a href="${pageContext.request.contextPath}/bookAction?pageIndex=${bookPagination.previousIndex }&pageSize=${bookPagination.pageSize}" aria-label="Previous"> <span aria-hidden="true">»上一页</span> </a> </li> </c:if> <c:if test="${bookPagination.pageLinkNumber gt 0}"> <c:set var="betweenIndex" value="${bookPagination.betweenIndex}"></c:set> <c:forEach var="linkIndex" begin="${betweenIndex.beginIndex}" end="${betweenIndex.endIndex}"> <c:if test="${linkIndex eq bookPagination.pageIndex}" var="isCurr"> <li class="active"><a href="#">${linkIndex}</a></li> </c:if> <c:if test="${not isCurr}"> <li><a href="${pageContext.request.contextPath}/bookAction?pageIndex=${linkIndex}&pageSize=${bookPagination.pageSize}" >${linkIndex}</a></li> </c:if> </c:forEach> </c:if> <c:if test="${isLast }"> <li class="disabled"> <a href="#" aria-label="Next"> <span aria-hidden="true">下一页 »</span> </a> </li> </c:if> <c:if test="${not isLast }"> <li> <a href="${pageContext.request.contextPath}/bookAction?pageIndex=${bookPagination.nextIndex }&pageSize=${bookPagination.pageSize}" aria-label="Next"> <span aria-hidden="true">下一页 »</span> </a> </li> </c:if> </ul> </nav> </center> </div> </body></html>

实例数据

说明:

• 如果需要扩展分页功能, 请扩展Pagiation接口以及其余实现类;
• 此外, 此分页不依赖任何数据库(重新实现QueryHandler查询回调接口即可), 可适用于任何web项目中;
  

使用List 集合模拟数据库的使用示例:

package com.app.service.impl;import java.util.ArrayList;import java.util.List;import com.app.bean.Book;import com.app.pagination.Pagination;import com.app.pagination.impl.DefaultPagination;import com.app.service.BookService;/** * 使用List<T>集合模拟数据库 * @author: super.wwz@hotmail.com * @ClassName: BookServiceImpl2 * @Version: v0.1 */public class BookServiceImpl2 implements BookService {// private BookDao bookDao = new BookDaoImpl(); private static List<Book> list = new ArrayList<Book>(); //初始化List<Book>数据 static { list.add(new Book(1, "书名1", 18)); list.add(new Book(2, "书名2", 13)); list.add(new Book(3, "书名3", 18)); list.add(new Book(4, "书名4", 38)); list.add(new Book(5, "书名5", 18)); list.add(new Book(6, "书名6", 58)); list.add(new Book(7, "书名7", 12)); list.add(new Book(8, "书名8", 11)); list.add(new Book(9, "书名9", 13)); list.add(new Book(10, "书名10", 22)); list.add(new Book(11, "书名11", 19)); list.add(new Book(12, "书名12", 13)); list.add(new Book(13, "书名13", 19)); list.add(new Book(14, "书名14", 32)); } @Override public Pagination<Book> getBookList(int pageIndex, int pageSize, int pageLinkNumber) { return new DefaultPagination<Book>(pageIndex, pageSize, new QueryHandler<Book>() { @Override public int getTotalElements() { //return bookDao.count(); return list.size(); } @Override public List<Book> getCurrData(int pageIndex, int pageSize) { //return bookDao.list(pageIndex, pageSize); int fromIndex = (pageIndex - 1) * pageSize; int endIndex = fromIndex + pageSize; endIndex = endIndex > list.size() ? list.size() : endIndex; return list.subList(fromIndex, endIndex); } }, pageLinkNumber); }}

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