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PageHelper插件实现服务器端分页功能

程序员文章站 2022-07-12 15:12:21
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一、添加依赖
在.pom文件中添加

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>3.5.1</version>
    </dependency>

二、添加配置
在spring-mybaits.xml文件中添加插件

     <!-- mybatis和spring完美整合，不需要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 自动扫描mapping.xml文件 -->
        <property name="mapperLocations" value="classpath:mapping/*.xml"></property>
        <!--分页插件-->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageHelper">
                    <property name="properties">
                        <value>
                            dialect=mysql
                            reasonable=true
                        </value>
                    </property>
                </bean>
            </array>
        </property>
        <!--分页-->
    </bean>

三、controller代码

    //分页展示用户
    @RequestMapping(value = "/user.do")
    public ModelAndView test1(HttpServletRequest request, HttpServletResponse response, ModelMap mode) throws Exception {

        ModelAndView modelAndView = new ModelAndView();
        int pageNumber = 1;
        try{
            if(request.getParameter("pageNow").equals(null)){
                System.out.println("参数空");
            }else {
                pageNumber = Integer.parseInt(request.getParameter("pageNow"));
            }
        }catch (Exception e){
            //处理空针错误
        }

        System.out.println("请求参数"+request.getParameter("pageNow"));
        PageInfo<user> pageInfo = userService.selectUserByPage(pageNumber,5);

//        Map<String, Object> map = new HashMap<String, Object>();
//        List<Object> data = new ArrayList<Object>();
//        for(user admin : pageInfo.getList()){
//            Map<String, Object> obj = new HashMap<String, Object>();
//            obj.put("id", admin.getId());
//            obj.put("username", admin.getUsername());
//            obj.put("password", admin.getPassword());
//            obj.put("enable", admin.getEnable());
//            obj.put("id_card", admin.getIdCard());
//            obj.put("phone", admin.getPhone());
//            obj.put("address", admin.getAddress());
//            obj.put("nick_name", admin.getAddress());
//            data.add(obj);
//        }
        modelAndView.addObject("pageInfo",pageInfo); //jsp 根据users来传递信息
        System.out.println("成功啦");
        modelAndView.setViewName("/test/user");
        return  modelAndView;
    }

四、Service方法

//分页获取用户信息
public PageInfo<User> selectUserByPage(Integer pageNum, Integer pageSize) {

    PageHelper.startPage(pageNum, pageSize);
    // 所有用户信息
    List<User> authAdmins = userMapper.selectUsers();
    if(authAdmins == null){
        return null;
    }
    PageInfo<User> pageInfo = new PageInfo<User>(authAdmins);
    return pageInfo;
}

五、jsp显示

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2017/12/2 0002
  Time: 11:10
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>user</title>
</head>
<body>
<h1>User</h1>
<table>
    <c:forEach items="${pageInfo.list}" var="u">
        <%--属性值映射mapper 中的property--%>
        <tr>
            <td>${u.id}</td>
            <td>${u.username}</td>
            <td>${u.password}</td>
            <td>${u.enable}</td>
            <td>${u.idCard}</td>
            <td>${u.phone}</td>
            <td>${u.address}</td>
            <td>${u.nickName}</td>
        </tr>
    </c:forEach>

    <tr>
        <td colspan="6">
            <!-- 分页功能 start -->
            <div align="center">
                <font size="2">共 ${pageInfo.pageSize} 页</font> <font size="2">第
                ${pageInfo.pageNum} 页</font> <a href="${pageContext.request.contextPath}/user.do?pageNow=1">首页</a>
                <c:choose>
                    <c:when test="${pageInfo.pageNum - 1 > 0}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageNum - 1}">上一页</a>
                    </c:when>
                    <c:when test="${pageInfo.pageNum - 1 <= 0}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=1">上一页</a>
                    </c:when>
                </c:choose>
                <%--pageSize共 页--%>
                <%--pageNum 第 页--%>
                <%--pagetotal 共 条--%>
                <c:choose>
                    <c:when test="${pageInfo.pageSize==0}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageNum}">下一页</a>
                    </c:when>
                    <c:when test="${pageInfo.pageNum + 1 < pageInfo.pageSize}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageNum + 1}">下一页</a>
                    </c:when>
                    <c:when test="${pageInfo.pageNum + 1 >= pageInfo.pageSize}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageSize}">下一页</a>
                    </c:when>
                </c:choose>
                <c:choose>
                    <c:when test="${pageInfo.pageSize==0}">
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageSize}">尾页</a>
                    </c:when>
                    <c:otherwise>
                        <a href="${pageContext.request.contextPath}/user.do?pageNow=${pageInfo.pageSize}">尾页</a>
                    </c:otherwise>
                </c:choose>
            </div>
            <!-- 分页功能 End -->
        </td>

    </tr>
    <%--<tr>--%>
        <%--<td>${data.username}</td>--%>
        <%--<td>${data.password}</td>--%>
    <%--</tr>--%>
</table>
</body>
</html>
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