1.分页万精油jsp页面,只需要传入pagebean对象
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %> <div class="dataTables_paginate paging_simple_numbers" id="DataTables_Table_0_paginate"> <a class="paginate_button previous disabled" aria-controls="DataTables_Table_0" data-dt-idx="0" tabindex="0" id="DataTables_Table_0_previous" href="<c:url value="${page.url}¤tPage=1"/>">首页</a> <c:if test="${page.currentPage > 1 }"> <a class="paginate_button previous disabled" aria-controls="DataTables_Table_0" data-dt-idx="0" tabindex="0" id="DataTables_Table_0_previous" href="<c:url value='${page.url}¤tPage=${page.currentPage - 1 }'/>">上一页</a> </c:if> <c:choose> <c:when test="${page.totalPage <= 10 }"> <c:set var="begin" value="1"/> <c:set var="end" value="${page.totalPage }"/> </c:when> <c:otherwise> <c:set var="begin" value="${page.currentPage-4 }"/> <c:set var="end" value="${page.currentPage+5 }"/> <c:choose> <c:when test="${begin < 1 }"> <c:set var="begin" value="1"/> <c:set var="end" value="10"/> </c:when> <c:when test="${end > page.totalPage }"> <c:set var="begin" value="${page.totalPage-9 }"/> <c:set var="end" value="${page.totalPage }"/> </c:when> </c:choose> </c:otherwise> </c:choose> <c:forEach begin="${begin}" end="${end}" var="i"> <c:choose> <c:when test="${i == page.currentPage}"><span style="color: red">${i}</span></c:when> <c:otherwise> <span><a class="paginate_button current" aria-controls="DataTables_Table_0" data-dt-idx="1" tabindex="0" href="<c:url value='${page.url}¤tPage=${i}'/>" > ${i}</a> </span> </c:otherwise> </c:choose> </c:forEach> <c:if test="${page.currentPage < page.totalPage }"> <a class="paginate_button next disabled" aria-controls="DataTables_Table_0" data-dt-idx="2" tabindex="0" id="DataTables_Table_0_next" href="<c:url value='${page.url}¤tPage=${page.currentPage + 1 }'/>" >下一页</a> </c:if> <a class="paginate_button next disabled" aria-controls="DataTables_Table_0" data-dt-idx="2" tabindex="0" id="DataTables_Table_0_next" href="<c:url value='${page.url}¤tPage=${page.totalPage}'/>" >尾页</a> </div>
2.PagaBean类,储存分页需要的数据
/** * 有些没必要设置get/set,为了节省时间,不搞了 * * @param <T> */ public class PageBean<T> { private int currentPage; //当前页 private int pageSize; //每页记录数 private int totalPage;//总页数 private List<T> pageBean;//当前页对象 private String url;//用来设置Servlet访问路径及method参数 private int totleCount;//总数据数 public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public List<T> getPageBean() { return pageBean; } public void setPageBean(List<T> pageBean) { this.pageBean = pageBean; } public String getUrl() { return url; } public void setUrl(String url,HttpServletRequest request) { String uri = request.getRequestURI(); //返回“项目名/请求Servlet名”的字符串 String quString = request.getQueryString(); //获取请求的参数部分 url = uri + "?" + quString; //拼串，请求地址：项目名/servlet名？参数 if (url.contains("¤tPage")) { //截串，将没有用的参数截去，只留下用于反射的method参数 url = url.substring(0, url.indexOf("¤tPage")); } this.url=url; } public int getTotleCount() { return totleCount; } public void setTotleCount(int totleCount) { this.totleCount = totleCount; } }
3.dao层,主要分为两个查询方法,一个是总记录数,一个是单页的对象集合,工具类用的是dbutils,数据连接池用的是c3p0
//查询全部获得总记录数 @Override public Integer totleCount() { String sql = "SELECT COUNT(*) FROM `grade` AS g LEFT JOIN `class` c ON g.`gradeId`=c.`gradeId`"; Integer totleCount = 0; try { totleCount=((Long)queryRunner.query(sql, new ScalarHandler<>())).intValue(); } catch (SQLException e) { e.printStackTrace(); } return totleCount; } //查询全部获取当前页对象集合 @Override public List<GradeAndClass> getRoleList(int pagesize, int begin) { String sql="SELECT g.`gradeId`,g.`gradeName`,c.`classId`,c.`className` ,c.`orderID` FROM `grade` AS g LEFT JOIN `class` c ON g.`gradeId`=c.`gradeId` LIMIT ?,?"; List<GradeAndClass> gas=null; try { gas = queryRunner.query(sql, new BeanListHandler<GradeAndClass>(GradeAndClass.class),new Object[]{begin,pagesize}); } catch (SQLException e) { e.printStackTrace(); } return gas; }
4.service层,调用dao层查询总记录数和当前页对象集合的方法,用于配置pagebean各个属性值,返回pageBean对象
//分页+查询全部 @Override public PageBean<GradeAndClass> page(Integer pagesize, Integer currentPage,HttpServletRequest request) { PageBean<GradeAndClass> pageBean = new PageBean<>(); //页面大小 pageBean.setPageSize(pagesize); //从数据库得到总记录数,将其放在pageBean里面 pageBean.setTotleCount(gcDao.totleCount()); //总页码 pageBean.setTotalPage(pageBean.getTotleCount() % pageBean.getPageSize() == 0 ? pageBean.getTotleCount() / pageBean.getPageSize() : pageBean.getTotleCount() / pageBean.getPageSize() + 1); //当前页 pageBean.setCurrentPage(currentPage); //设置url pageBean.setUrl("/main/gc?action=getPage",request); //从数据库获取当前页面数据集合,传值给pageBean对象 pageBean.setPageBean(gcDao.getRoleList(pageBean.getPageSize(), (pageBean.getCurrentPage() - 1) * (pageBean.getPageSize()))); return pageBean; }
4.servlet层,获取前端传的页码,返回给前端List集合(用于展示分页的内容),pagebean对象(pagebean对象用于分页jsp页面)
//查询全部并分页 public String getPage(HttpServletRequest request, HttpServletResponse response){ //获取前端传来的当前页码 Integer currentPage = Integer.parseInt(request.getParameter("currentPage")); //获取PageBean对象 PageBean<GradeAndClass> page = gcService.page(5, currentPage,request); List<GradeAndClass> pageBean = page.getPageBean(); request.setAttribute("page",page); request.setAttribute("gc",pageBean); return "/WEB-INF/views/main/allGCPage.jsp"; }
5.引用分页jsp页面,放在需要分页的jsp页面适当位置,引用的是分页页面
<%@include file="pageModel.jsp"%>
6.触发分页,传参当前页
<li><a data-href="/main/gcc?action=getPage¤tPage=1" data-title="课程管理" href="javascript:void(0)">全部课程</a></li>