Bootstrap和Java分页实例第一篇

关于此文

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: [email protected]
 * @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: [email protected]
 * @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: [email protected]
 * @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) {
 /*//普通算法:
 this.totalPages = totalElements % pageSize == 0 ?
  totalElements / pageSize : (totalElements / pageSize) + 1;*/
 //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: [email protected]
 * @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: [email protected]
 * @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: [email protected]
 * @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);
 }
}

下一篇更精彩！