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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) {
/*//普通算法:
this.totalPages = totalElements % pageSize == 0 "htmlcode">
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 ");
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="${requestScope.bookPagination == null }">
<c:redirect url="bookAction"></c:redirect>
</c:if>
<!DOCTYPE html">
<html>
<head>
<title>图书信息列表</title>
<!-- Bootstrap v3.3.5 -->
<link href="${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="/UploadFiles/2021-04-02/jquery.min.js">
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！
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相思资源网 Design By www.200059.com
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