JavaWeb--简单分页技术

分页需要的技术点：1.前台分页标签的使用

　　　　　　　　　3.MSQL用到的语句 limit

　　　　　　　　　4.封装pageBean对象

这个是PageBean用到的

分页公式：

int totalPageNum = (totalRecord + pageSize - 1) / pageSize;

package com.itheima.vo;

import java.util.ArrayList;

import java.util.List;

import com.itheima.domain.Product;

public class PageBean<T> {

    //当前页

    private int currentPage;

    //当前页显示的条数

    private int currentCount;

    //总条数

    private int totalCount;

    //总页数

    private int totalPage;

    //每页显示的数据

    private List<T> productList = new ArrayList<T>();

    public int getCurrentPage() {

        return currentPage;

    }

    public void setCurrentPage(int currentPage) {

        this.currentPage = currentPage;

    }

    public int getCurrentCount() {

        return currentCount;

    }

    public void setCurrentCount(int currentCount) {

        this.currentCount = currentCount;

    }

    public int getTotalCount() {

        return totalCount;

    }

    public void setTotalCount(int totalCount) {

        this.totalCount = totalCount;

    }

    public int getTotalPage() {

        return totalPage;

    }

    public void setTotalPage(int totalPage) {

        this.totalPage = totalPage;

    }

    public List<T> getProductList() {

        return productList;

    }

    public void setProductList(List<T> productList) {

        this.productList = productList;

    }

}

前台页面上的分页标签显示逻辑

    <!--分页 -->

    <div style="width: 380px; margin: 0 auto; margin-top: 50px;">

        <ul class="pagination" style="text-align: center; margin-top: 10px;">

            <!-- 上一页 -->

            <!-- 判断当前页是否是第一页 -->

            <c:if test="${pageBean.currentPage==1 }">

                <li class="disabled">

                    <a href="javascript:void(0);" aria-label="Previous">

                        <span aria-hidden="true">&laquo;</span>

                    </a>

                </li>

            </c:if>

            <c:if test="${pageBean.currentPage!=1 }">

                <li>

                    <a href="${pageContext.request.contextPath }/productList?currentPage=${pageBean.currentPage-1}" aria-label="Previous">

                        <span aria-hidden="true">&laquo;</span>

                    </a>

                </li>

            </c:if>    

            <c:forEach begin="1" end="${pageBean.totalPage }" var="page">

                <!-- 判断当前页 -->

                <c:if test="${pageBean.currentPage==page }">

                    <li class="active"><a href="javascript:void(0);">${page}</a></li>

                </c:if>

                <c:if test="${pageBean.currentPage!=page }">

                    <li><a href="${pageContext.request.contextPath }/productList?currentPage=${page}">${page}</a></li>

                </c:if>

            </c:forEach>

            <!-- 判断当前页是否是最后一页 -->

            <c:if test="${pageBean.currentPage==pageBean.totalPage }">

                <li class="disabled">

                    <a href="javascript:void(0);" aria-label="Next">

                        <span aria-hidden="true">&raquo;</span>

                    </a>

                </li>

            </c:if>

            <c:if test="${pageBean.currentPage!=pageBean.totalPage }">

                <li>

                    <a href="${pageContext.request.contextPath }/productList?currentPage=${pageBean.currentPage+1}" aria-label="Next">

                        <span aria-hidden="true">&raquo;</span>

                    </a>

                </li>

            </c:if>

        </ul>

    </div>

    <!-- 分页结束 -->

巴特西

JavaWeb--简单分页技术

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