<dependency>

            <groupId>com.github.pagehelper</groupId>

            <artifactId>pagehelper</artifactId>

            <version>4.1.0</version>

        </dependency>

<!--解决pagehelper分页警告  -->

            <!-- <dependency>

                <groupId>com.github.pagehelper</groupId>

                <artifactId>pagehelper</artifactId>

                <version>3.4.2-fix</version>

            </dependency> -->

<div class="col-md-12 text-center">

                        <nav aria-label="Page navigation">

                            <ul class="pagination">

                                <li>

                                    <a href="/details?${detail.id}?pn=1" aria-label="First">

                                        <span aria-hidden="true">首页</span>

                                    </a>

                                </li>

                                <c:if test="${pageInfo.hasPreviousPage}">

                                <li >

                                    <a href="/details?${detail.id}?pn=${pageInfo.pageNum-1}" aria-label="Previous">

                                        <span aria-hidden="true">上一页</span>

                                    </a>

                                </li>

                                </c:if>

                                <c:if test="${!pageInfo.hasPreviousPage}">

                                <li >

                                    <a href="#" aria-label="Previous">

                                        <span aria-hidden="true">上一页</span>

                                    </a>

                                </li>

                                </c:if> 

                                <!--循环遍历连续显示的页面，若是当前页就高亮显示，并且没有链接-->

                                <c:forEach items="${pageInfo.navigatepageNums}" var="page_num">

                                    <c:if test="${page_num == pageInfo.pageNum}">

                                        <li class="active"><a href="#">${page_num}</a></li>

                                    </c:if>

                                    <c:if test="${page_num != pageInfo.pageNum}">

                                        <li><a href="/details?${detail.id}?pn=${page_num}">${page_num}</a></li>

                                    </c:if>

                                </c:forEach>

                                <c:if test="${pageInfo.hasNextPage}">

                                <li>

                                    <a href="/details?${detail.id}?pn=${pageInfo.pageNum+1}" aria-label="Next">

                                        <span aria-hidden="true">下一页</span>

                                    </a>

                                </li>

                                </c:if>

                                <c:if test="${!pageInfo.hasNextPage}">

                                            <li>

                                                <a href="#" aria-label="Next">

                                                    <span aria-hidden="true">下一页</span>

                                                </a>

                                            </li>

                                </c:if>

                                <li>

                                    <a href="/details?${detail.id}?pn=${pageInfo.pages}" aria-label="Last">

                                        <span aria-hidden="true">尾页</span>

                                    </a>

                                </li>

                            </ul>

                        </nav>

                        <!-- <div style="text-align: center;">

                            <ul id="pagination" class="pagination"></ul>

                        </div> -->

                    </div>

@RequestMapping("/details")

    public String webdetail(Model model,@RequestParam(required = false,defaultValue = "1",value = "pn")Integer pn)throws Exception {

        PageInfo pageInfo = detailService.commentList(pn);

        model.addAttribute("pageInfo", pageInfo);

        return "details";

    }

@Override

    public PageInfo commentList(Integer pn) throws Exception {

         //引入分页查询，使用PageHelper分页功能

        //在查询之前传入当前页，然后多少记录

        PageHelper.startPage(pn,5);

        //startPage后紧跟的这个查询就是分页查询

        CommentExample example = new CommentExample();

        List<Comment> emps = commentMapper.selectByExample(example);

        //使用PageInfo包装查询结果，只需要将pageInfo交给页面就可以

        PageInfo pageInfo = new PageInfo<>(emps,5);

        //pageINfo封装了分页的详细信息，也可以指定连续显示的页数  

        return pageInfo;

    }