Spring学习笔记（十四）——ssm整合mybitis的逆向工程和分页插件

ssm整合mybitis的逆向工程

1. 引入jar包

mybatis generator http://www.mybatis.org/generator/

代码语言：javascript复制

 <!-- MyBatis Generator Core-->
        <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>

2、添加一个配置文件mgb.xml（MBG配置（mybatis generator简称））

参考文档： http://www.mybatis.org/generator/configreference/xmlconfig.html

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--导入的类什么的，我们不需要，直接删除-->
    <!--<classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />-->

    <context id="DB2Tables" targetRuntime="MyBatis3Simple">
        <!--如果不配置这个，生成的文件会有很多的注释，不方便看代码-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--配置数据库连接-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://kt01:3306/kongtao?characterEncoding=utf8&useSSL=false"
                        userId="root"
                        password="123456">
        </jdbcConnection>
        <!--配置数据库连接-->

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--JAVA模型生成，指定javabean生成位置-->
        <javaModelGenerator targetPackage="cn.qkongtao.model" targetProject=".srcmainjava">
            <!--JAVA模型生成，指定javabean生成位置-->
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--指定sql映射文件生成位置-->
        <sqlMapGenerator targetPackage="mapper" targetProject=".srcmainresources">
            <!--指定sql映射文件生成位置-->
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!--指定dao生成的位置，mapper接口-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="cn.qkongtao.mapper" targetProject=".srcmainjava">
            <!--指定dao生成的位置，mapper接口-->
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--table指定表的生成策略-->
        <table tableName="areaEd" domainObjectName="Area" >
            <!--字段区分大小写-->
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="historyEd" domainObjectName="History">
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="provinceEd" domainObjectName="Province">
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="totalEd" domainObjectName="Total">
            <property name="useActualColumnNames" value="true"/>
        </table>

    </context>
</generatorConfiguration>

3. 编写一个Generator.java类（用来运行配置生成生成代码）

代码语言：javascript复制

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;


public class Generator {

    public void generator() throws Exception{
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src/main/mgb.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);
    }
    public static void main(String[] args) throws Exception {
        try {
            Generator generatorSqlmap = new Generator();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

4.点击运行

就会在配置好的对应文件里面生成model、mapper和xml等文件。 如图所示

5. 测试逆向工程生成的方法

代码语言：javascript复制

package cn.qkongtao.test;/*
 *Created by tao on 2020-04-27.
 */

import cn.qkongtao.mapper.ProvinceMapper;
import cn.qkongtao.model.Province;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

/*
 * 使用Junit单元测试：测试我们的配置
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class GeneratorTest {
    @Autowired
    private ProvinceMapper provinceMapper;

    @Test
    public void findAll() {
        List<Province> provinces = provinceMapper.selectAll();
        for (Province province : provinces) {
            System.out.println(province);
        }
    }
}

测试结果如下

ssm整合分页插件

1. 引入jar包

代码语言：javascript复制

 <!-- 引入mybatis的 pagehelper 分页插件 -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.2</version>
    </dependency>

2. 整合Mybatis配置文件增加分页插件

代码语言：javascript复制

<!-- 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"/>
        <!-- 扫描model包 -->
        <!--修改-->
        <property name="typeAliasesPackage" value="cn.qkongtao.model"/>
        <!-- 扫描sql配置文件:mapper需要的xml文件-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        <!--分页插件-->
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <prop key="helperDialect"></prop>
                            <prop key="reasonable"></prop>
                        </props>
                    </property>
                </bean>
            </array>
        </property>

    </bean>

1. 分页插件的使用

* 控制类

代码语言：javascript复制

package cn.qkongtao.controller;/*
 *Created by tao on 2020-04-27.
 */

import cn.qkongtao.mapper.ProvinceMapper;
import cn.qkongtao.model.Province;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
@Controller
public class ProvinceController {
    @Autowired
    private ProvinceMapper provinceMapper;
    /**
     * 分页查询:
     * 参数：把当前页数传到后台，并且给他一个默认值
     *      把查到的数据和分页类传到前台页面
     */
    @RequestMapping("queryByPage")
    public String queryByPage(@RequestParam(value=("page"),defaultValue = "1")Integer page, Model model){
        PageHelper.startPage(page, 10);//每页条数=3
        //查询数据
        List<Province> provinces = provinceMapper.selectAll();
        //查看一下是否查到了数据
        for (Province province : provinces) {
            System.out.println(province);
        }
        /**
         * pageNum:当前页
         * pageSize:每页的数量
         * size:当前页的数量
         * pages:总页数
         * total:总记录数
         */
        /**
         *  PageInfo就是当初那个分页工具类(分页bean)
         */
        PageInfo<Province> pageInfo = new PageInfo<Province>(provinces);//把数据放在分页类中
        System.out.println(pageInfo.toString());
        //封装数据
        model.addAttribute("provinces", provinces);
        //传分页类
        model.addAttribute("pageInfo", pageInfo);
        return "provinceList";//跳转页面
    }
}

• 前台页面jsp 使用bootstrap的分页样式

代码语言：javascript复制

<%--
  Created by IntelliJ IDEA.
  User: tao
  Date: 2020-04-27
  Time: 19:43
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!-- 引入jstl核心标签库-->
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>省份列表</title>
    <style type="text/css">
        td, th {
            text-align: center;
        }
    </style>
</head>
<!-- 1. 导入CSS的全局样式 -->
<link href="${pageContext.request.contextPath}/css/bootstrap.min.css" rel="nofollow noopener"  rel="stylesheet">
<!-- 2. jQuery导入，建议使用1.9以上的版本 -->
<script src="${pageContext.request.contextPath}/js/jquery-2.1.0.min.js"></script>
<!-- 3. 导入bootstrap的js文件 -->
<script src="${pageContext.request.contextPath}/js/bootstrap.min.js"></script>
<body>

<h4 style="text-align: center">省份信息列表</h4>
<!-- 数据部分 -->
<table border="1" class="table table-bordered table-hover" style="width: 1200px;margin: 20px auto;">
    <tr>
        <td>编号</td>
        <td>省份名称</td>
        <td>确诊人数</td>
        <td>死亡人数</td>
        <td>治愈人数</td>
    </tr>
    <tbody>
    <c:forEach items="${provinces}" var="province" varStatus="s">
        <tr>
            <td>${s.count}</td>
            <td>${province.provinceName}</td>
            <td>${province.confirmedNum}</td>
            <td>${province.deathsNum}</td>
            <td>${province.curesNum}</td>
        </tr>
    </c:forEach>
    </tbody>
</table>
<br>
<%--分页--%>
<div style="width: 800px;text-align: center;margin: 20px auto">
    <nav aria-label="Page navigation">
        <ul class="pagination">
            <%--如果是第一页不允许上一页--%>
            <c:if test="${pageInfo.pageNum == 1}">
                <li class="disabled"><span aria-hidden="true">«</span></li>
            </c:if>
            <c:if test="${pageInfo.pageNum != 1}">
                <li>
                    <a href="/queryByPage?page=${pageInfo.prePage}" rel="nofollow noopener" 
                       aria-label="Previous">
                        <span aria-hidden="true">«</span>
                    </a>
                </li>
            </c:if>
            <%--分页的页码--%>
            <c:forEach begin="1" end="${pageInfo.pages}" var="i">
                <c:if test="${pageInfo.pageNum == i}">
                    <li class="active"><a
                            href="/queryByPage?page=${i}" rel="nofollow noopener"  rel="nofollow noopener" >${i}</a>
                    </li>
                </c:if>
                <c:if test="${pageInfo.pageNum != i}">
                    <li>
                        <a href="/queryByPage?page=${i}" rel="nofollow noopener"  rel="nofollow noopener" >${i}</a>
                    </li>
                </c:if>
            </c:forEach>
            <%--判断是否是最后一页--%>
            <c:if test="${pageInfo.pageNum == pageInfo.pages}">
                <li class="disabled"><span aria-hidden="true">»</span></li>
            </c:if>
            <c:if test="${pageInfo.pageNum != pageInfo.pages}">
                <li>
                    <a href="/queryByPage?page=${pageInfo.nextPage}" rel="nofollow noopener" 
                       aria-label="Next">
                        <span aria-hidden="true">»</span>
                    </a>
                </li>
            </c:if>
            <span style="font-size: 25px;margin-left: 5px;">
                    共${pageInfo.total}条记录，共${pageInfo.pages}页
            </span>
        </ul>
    </nav>
</div>
</body>
</html>

3. 实现效果如下

http jar 腾讯云测试服务 mybatis javascript

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