pageHelper分页

<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;

    }