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: 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) {
/*//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: 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);
}
}

下一篇更精彩！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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