Bootstrap和Java分页实例第一篇

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

*/

public interface Pagination {

/**

* 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 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

*/

public class DefaultPagination implements Pagination {

private int totalElements;

private int pageSize;

private int totalPages;

private int pageIndex;

private QueryHandler queryHandler;

private List currData;

private int pageLinkNumber;

public DefaultPagination(int pageIndex, int pageSize, QueryHandler queryHandler, int pageLinkNumber) {

this(pageIndex, pageSize, queryHandler);

setPageLinkNumber(pageLinkNumber);

}

public DefaultPagination(int pageIndex, int pageSize, QueryHandler 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 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

*/

public interface QueryHandler {

/**

* 获取数据总行数

* @return

*/

int getTotalElements();

/**

* 获取当前页的数据

* @param pageIndex

* @param pageSize

* @return

*/

List 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());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return 0;

}

@Override

public List 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.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 getBookList(int pageIndex, int pageSize,int pageLinkNumber) {

// TODO Auto-generated method stub

return new DefaultPagination(pageIndex, pageSize, new QueryHandler() {

@Override

public int getTotalElements() {

// TODO Auto-generated method stub

return bookDao.count();

}

@Override

public List 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 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" %>

type="text/css" rel="stylesheet" charset="utf-8" />

href="${pageContext.request.contextPath}/bootstrap-3.3.5-dist/css/bootstrap-theme.min.css"

type="text/css" rel="stylesheet" charset="utf-8" />

首页

上一页

首页

上一页

下一页

尾页

下一页

尾页

»上一页

»上一页

下一页 »

下一页 »

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 list = new ArrayList();

//初始化List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 getBookList(int pageIndex, int pageSize, int pageLinkNumber) {

return new DefaultPagination(pageIndex, pageSize, new QueryHandler() {

@Override

public int getTotalElements() {

//return bookDao.count();

return list.size();

}

@Override

public List 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！

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。