MyBatis分页插件PageHelper简单使用

一、导入依赖

 <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>

二、整合ssm框架

在sqlSessionFactoryBean内加入配置即可

 <!-- 把交给IOC管理 SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <prop key="helpDialect">oracle</prop>
                            <prop key="reasonable">true</prop>
                        </props>
                    </property>
                </bean>
            </array>
        </property>

    </bean>

三、coding部分

在controller层传入参数（page:当前页码，pageSize:每页显示的条数）

controller层

@Controller
@RequestMapping("/orders")
public class OrdersController {
    @Autowired
    private IOrdersService ordersService;
  
    @RequestMapping("/findAll.do")
    public ModelAndView findAll(@RequestParam(name = "page", required = true, defaultValue =
            "1") Integer page, @RequestParam(name = "pageSize", required = true, defaultValue = "4")
                                        Integer pageSize) throws Exception {
        List<Orders> ordersList = ordersService.findAll(page,pageSize);
        PageInfo pageInfo = new PageInfo(ordersList);
        ModelAndView mv = new ModelAndView();
        mv.setViewName("orders-list");
        mv.addObject("pageInfo", pageInfo);
        return mv;
    }
}

service层

PageHelper.startPage(page,pageSize);一定要在查询方法前中间不能插入其他代码 ，否则拦截器无法将分页语句注入。

@Service
public class IOrdersServiceImpl implements IOrdersService {

    @Autowired
    private IOrdersDao ordersDao;
    @Override
    public List<Orders> findAll(Integer page,Integer pageSize) throws Exception {
        PageHelper.startPage(page,pageSize);
        List<Orders> list = ordersDao.findAll();
        return list;

    }
}

四、前端页面显示

<div class="box-footer">
                    <div class="pull-left">
                        <div class="form-group form-inline">
                            总共${pageInfo.pages}页，共${pageInfo.total} 条数据。 每页
                            <select class="form-control" id="changePageSize" onchange="changePageSize()">
                                <option>1</option>
                                <option>2</option>
                                <option>3</option>
                                <option>4</option>
                                <option>5</option>
                            </select> 条
                        </div>
                    </div>

                    <div class="box-tools pull-right">
                        <ul class="pagination">
                            <li>
                                <a href="${pageContext.request.contextPath}/orders/findAll.do?page=1&pageSize=${pageInfo.pageSize}" aria-label="Previous">首页</a>
                            </li>
                            <li><a href="${pageContext.request.contextPath}/orders/findAll.do?page=${pageInfo.pageNum-1}&pageSize=${pageInfo.pageSize}">上一页</a></li>
                            <c:forEach begin="1" end="${pageInfo.pages}" var="pageNum">
                                <li><a href="${pageContext.request.contextPath}/orders/findAll.do?page=${pageNum}&pageSize=${pageInfo.pageSize}">${pageNum}</a></li>
                            </c:forEach>
                            <li><a href="${pageContext.request.contextPath}/orders/findAll.do?page=${pageInfo.pageNum+1}&pageSize=${pageInfo.pageSize}">下一页</a></li>
                            <li>
                                <a href="${pageContext.request.contextPath}/orders/findAll.do?page=${pageInfo.pages}&pageSize=${pageInfo.pageSize}" aria-label="Next">尾页</a>
                            </li>
                        </ul>
                    </div>

                </div>

注：

PageInfo类相当于一个分页Bean

该类中的相关属性：

list:表示分页后每页显示的数据

pages:表示总页数

pageSize：表示当前页显示的条数

total:表示总条数

pageNum:表示当前页（当前页页码）