ssm下使用分页插件PageHelper进行分页

1. 导入maven依赖：

<dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.</version>
</dependency>

2. 编写SqlConfig.xml配置文件(这个文件的名字任意)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!-- mybatis分页插件 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>
</configuration>

3. 编写controller方法，注意：查询的方法必须紧跟在PageHelper.startPage(pn, 10); 这条语句后面！！

 /**
      * 查看所有问题
      *
      * @param model
      * @return
      */
     @RequestMapping("/findAll")
     public String findAll(@RequestParam(value="pn",defaultValue="1")Integer pn, Model model) {
         //从第一条开始 每页查询10条数据
         PageHelper.startPage(pn, 10);
         List<Question> questions = questionService.findAll();
         //将用户信息放入PageInfo对象里
         PageInfo page = new PageInfo(questions,10);
         model.addAttribute("pageInfo", page);
         return "question_list";
     }

4. jsp页面显示：question_list.jsp

         <%--页面数据展示--%>
         <div id="table-div">
             <table class="table table-hover">
                 <c:forEach items="${pageInfo.list}" var="question" varStatus="vs">
                     <tr>
                         <td class="td1">
                             <a href="${pageContext.request.contextPath}/question/look?qid=${question.qid}">
                                 <img src="${pageContext.request.contextPath}/images/question_logo.png"
                                      style="width: 20px;height: 20px;"/> ${question.title}
                             </a>
                             <font color="red"> - [悬赏 ${question.credit} 积分] </font>
                             <c:if test="${question.isResolved == 1}">
                                 (已解决)
                             </c:if>
                         </td>
                         <td class="td2">
                             <fmt:formatDate value="${question.askTime}" pattern="yyyy-MM-dd HH:mm"/>
                             &nbsp;&nbsp;&nbsp;
                         </td>
                     </tr>
                 </c:forEach>
             </table>
         </div>

         <!-- 分页条 -->
         <div id="div_pagination_bottom">
             <nav aria-label="Page navigation">
                 <ul class="pagination">
                     <li>
                         <a href="${pageContext.request.contextPath}/question/findAll?pn=${pageInfo.pageNum-1}"
                            aria-label="Previous">
                             <span aria-hidden="true">&laquo;</span>
                         </a>
                     </li>
                     <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="${pageContext.request.contextPath}/question/findAll?pn=${ page_Num}">${ page_Num}</a>
                             </li>
                         </c:if>
                     </c:forEach>
                     <li>
                         <a href="${pageContext.request.contextPath}/question/findAll?pn=${pageInfo.pageNum+1}"
                            aria-label="Next">
                             <span aria-hidden="true">&raquo;</span>
                         </a>
                     </li>
                 </ul>
             </nav>
         </div>