前五后四分页条的实现_jsp页面

程序员文章站 2022-03-12 19:44:47

jsp页面代码

<div>
        <nav aria-label="Page navigation">
            <ul class="pagination">
                <c:if test="${pb.currentPage == 1}">
                    <li class="disabled">
                        <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${pb.currentPage - 1}&rows=5"
                           aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                        </a>
                    </li>
                </c:if>

                <c:if test="${pb.currentPage != 1}">
                    <li class="active">
                        <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${pb.currentPage - 1}&rows=5"
                           aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                        </a>
                    </li>
                </c:if>

                <%--将域中的begin与end传入即可--%>
                <c:forEach begin="${pb.begin}" end="${pb.end}" var="i">
                    <c:if test="${i == pb.currentPage}">
                        <li class="active">
                            <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${i}&rows=5">${i}</a>
                        </li>
                    </c:if>

                    <c:if test="${i != pb.currentPage}">
                        <li>
                            <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${i}&rows=5">${i}</a>
                        </li>
                    </c:if>
                </c:forEach>


                <c:if test="${pb.currentPage == pb.totalPage}">
                    <li class="disabled">
                        <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${pb.currentPage + 1}&rows=5"
                           aria-label="Next">
                            <span aria-hidden="true">&raquo;</span>
                        </a>
                    </li>
                </c:if>

                <c:if test="${pb.currentPage != pb.totalPage}">
                    <li class="active">
                        <a href="${pageContext.request.contextPath}/findPageUserServlet?currentPage=${pb.currentPage + 1}&rows=5"
                           aria-label="Next">
                            <span aria-hidden="true">&raquo;</span>
                        </a>
                    </li>
                </c:if>
                <span style="font-size: 25px;margin-left: 5px;">
                    共${pb.totalCount}条记录，共${pb.totalPage}页
                </span>

            </ul>
        </nav>


    </div>

服务器代码实现

web层

@WebServlet("/findPageUserServlet")
public class FindPageUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");

        String currentPage = request.getParameter("currentPage");
        String rows = request.getParameter("rows");

        //设置第一次页码为1.
        if (currentPage == null || currentPage.trim().length() == 0){
            currentPage = "1";
        }

        if (rows == null || rows.trim().length() == 0){
            rows = "5";
        }

        Map<String, String[]> map = request.getParameterMap();


        UserService service = new UserServiceImpl();
        PageBean<User> pb = service.findPageBean(currentPage,rows,map);

        //实现前五后四
        request.setAttribute("pb",pb);
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

service层

public class UserServiceImpl implements UserService {
    private UserDao dao = new UserDaoImpl();
    @Override
    public PageBean<User> findPageBean(String _currentPage, String _rows, Map<String, String[]> map) {

        //设置参数
        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);
        if (currentPage <= 0 ){
            currentPage = 1;
        }
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);

        //总页数
        int totalCount = dao.totalCount(map);
        pb.setTotalCount(totalCount);

        //总页码 
        int totalPage = totalCount % rows == 0 ? totalCount/rows : totalCount/rows+1;
        pb.setTotalPage(totalPage);

        //前五后四效果
        int begin;
        int end;
        if (totalPage < 10){
            begin = 1;
            end = totalPage;
        } else {
            begin = currentPage - 5;
            end = currentPage + 4;

            if ( begin < 1 ){
                begin = 1;
                end = begin + 9;
            }

            if (end > totalPage){
                end = totalPage;
                begin = end - 9 ;
            }
        }
        pb.setBegin(begin);
        pb.setEnd(end);

        return pb;
    }

本文地址：https://blog.csdn.net/weixin_45958862/article/details/107280788

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