1.项目需要的依赖包（jar包）
    在pom.xml添加包依赖：

    1. <?xml version="1.0" encoding="UTF-8"?>
    2. <project xmlns="http://maven.apache.org/POM/4.0.0"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    5.   <modelVersion>4.0.0</modelVersion>
    7.   <name>ssm-curd</name>
    8.   <groupId>com.wj</groupId>
    9.   <artifactId>ssm-curd</artifactId>
    10.   <version>1.0-SNAPSHOT</version>
    11.   <packaging>war</packaging>
    14.   <properties>
    15.     <!-- 统一管理项目中 Spring 的版本 -->
    16.     <edu.hue.spring.version>5.2.9.RELEASE</edu.hue.spring.version>
    17.   </properties>
    19.   <!-- 引入项目依赖的 jar 包 -->
    20.   <dependencies>
    22.     <!-- Spring 的 SpringMVC 模块的 的 jar 包 -->
    23.     <dependency>
    24.       <groupId>org.springframework</groupId>
    25.       <artifactId>spring-webmvc</artifactId>
    26.       <version>${edu.hue.spring.version}</version>
    27.     </dependency>
    29.     <!--返回json字符串自持-->
    30.     <dependency>
    31.       <groupId>com.fasterxml.jackson.core</groupId>
    32.       <artifactId>jackson-databind</artifactId>
    33.       <version>2.9.9</version>
    34.     </dependency>
    36.     <!-- Spring JDBC 模块的 jar 包 -->
    37.     <dependency>
    38.       <groupId>org.springframework</groupId>
    39.       <artifactId>spring-jdbc</artifactId>
    40.       <version>${edu.hue.spring.version}</version>
    41.     </dependency>
    43.     <!-- 引入 Spring 单元测试模块 -->
    44.     <dependency>
    45.       <groupId>org.springframework</groupId>
    46.       <artifactId>spring-test</artifactId>
    47.       <version>${edu.hue.spring.version}</version>
    49.     </dependency>
    52.     <!-- Spring 面向切面编程的 jar 包 -->
    53.     <dependency>
    54.       <groupId>org.springframework</groupId>
    55.       <artifactId>spring-aspects</artifactId>
    56.       <version>${edu.hue.spring.version}</version>
    57.     </dependency>
    59.     <!-- 引入 MyBatis 的 jar 包 -->
    60.     <dependency>
    61.       <groupId>org.mybatis</groupId>
    62.       <artifactId>mybatis</artifactId>
    63.       <version>3.4.6</version>
    64.     </dependency>
    66.     <!-- MyBatis整合 Spring的适配包 -->
    67.     <dependency>
    68.       <groupId>org.mybatis</groupId>
    69.       <artifactId>mybatis-spring</artifactId>
    70.       <version>1.3.1</version>
    71.     </dependency>
    73.     <!-- 引入mybatis逆向工程的jar包 -->
    74.     <dependency>
    75.       <groupId>org.mybatis.generator</groupId>
    76.       <artifactId>mybatis-generator-core</artifactId>
    77.       <version>1.3.7</version>
    78.     </dependency>
    81.     <!-- 数据库连接池、驱动 -->
    82.     <dependency>
    83.       <groupId>com.alibaba</groupId>
    84.       <artifactId>druid</artifactId>
    85.       <version>1.1.12</version>
    86.     </dependency>
    88.     <!-- 连接mysql的驱动 -->
    89.     <dependency>
    90.       <groupId>mysql</groupId>
    91.       <artifactId>mysql-connector-java</artifactId>
    92.       <version>5.1.47</version>
    93.     </dependency>
    95.     <!-- 引入 jstl -->
    96.     <dependency>
    97.       <groupId>jstl</groupId>
    98.       <artifactId>jstl</artifactId>
    99.       <version>1.2</version>
    100.     </dependency>
    102.     <!-- servlet-api -->
    103.     <dependency>
    104.       <groupId>javax.servlet</groupId>
    105.       <artifactId>javax.servlet-api</artifactId>
    106.       <version>3.0.1</version>
    107.       <scope>provided</scope>
    108.     </dependency>
    110.     <!-- junit -->
    111.     <dependency>
    112.       <groupId>junit</groupId>
    113.       <artifactId>junit</artifactId>
    114.       <version>4.13.2</version>
    115.       <scope>test</scope>
    116.     </dependency>
    118.     <!-- 引入pagehelper分页查询插件 -->
    119.     <dependency>
    120.       <groupId>com.github.pagehelper</groupId>
    121.       <artifactId>pagehelper</artifactId>
    122.       <version>5.2.0</version>
    123.     </dependency>
    125.     <!--加入校验包-->
    126.     <dependency>
    127.       <groupId>org.hibernate</groupId>
    128.       <artifactId>hibernate-validator</artifactId>
    129.       <version>5.4.1.Final</version>
    130.     </dependency>
    134.   </dependencies>
    137.   <build>
    138.     <plugins>
    139.       <plugin>
    140.         <groupId>org.apache.maven.plugins</groupId>
    141.         <artifactId>maven-surefire-plugin</artifactId>
    142.         <version>2.4.2</version>
    143.         <configuration>
    144.           <skipTests>true</skipTests>
    145.         </configuration>
    146.       </plugin>
    147.     </plugins>
    149.   </build>
    154. </project>

    完成查看：
    image.png
    2.创建mybatis配置文件：mybatis-3-config.xml

    <?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>
    <!--驼峰命名规则-->
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!--类型别名-->
    <typeAliases>
        <package name="com.wj.crud.bean"/>
    </typeAliases>

    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--分页参数合理化  -->
            <property name="reasonable" value="true"/>
        </plugin>
    </plugins>

</configuration>

    3.创建Spring配置文件：applicationContext.xml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd
                           http://mybatis.org/schema/mybatis-spring
                           http://mybatis.org/schema/mybatis-spring.xsd
                           http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- Spring配置文件，这里主要是和业务逻辑有关的 -->

    <!-- Spring不扫描控制器 -->
    <context:component-scan base-package="com.wj.crud">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- =============================数据源=============================== -->
    <context:property-placeholder location="classpath:dbconfig.properties"></context:property-placeholder>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!-- =============================数据源=============================== -->

    <!-- ============================事务控制的配置================================ -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 指定数据源的位置 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 两种方法：
            1、开启基于注解的事务
            2、使用 xml 配置形式的事务（比较重要的都使用配置式）
    -->
    <!-- 配置式 -->
    <aop:config>
        <!-- 配置切入点 expression：切入点表达式 -->
        <aop:pointcut id="txPoint" expression="execution(* com.wj.crud.service..*(..))"/>
        <!-- 配置切面：配置事务增强 -->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"></aop:advisor>
    </aop:config>

    <!-- 配置事务增强：如何切入 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- *：表示所有方法都是事务方法 -->
            <tx:method name="*"/>
            <!-- 以get开始的方法
                read-only="true"：设置只读
            -->
            <tx:method name="get*" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!-- ============================事务控制的配置================================ -->

    <!-- ==============================配置和 MyBatis 的整合============================ -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 指定 MyBatis全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 指定 mapper 文件的位置 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>

    <!-- 扫描所有 mapper 接口的实现类，将其加入 IOC 容器中 -->
    <mybatis:scan base-package="com.wj.crud.dao"></mybatis:scan>
    <!-- ==============================配置和 MyBatis 的整合============================ -->

    <!-- 配置一个可以执行批量操作的sqlSession -->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"/>
        <constructor-arg name="executorType" value="BATCH"></constructor-arg>
    </bean>

</beans>

    4.数据库连接配置文件：dbconfig.properties

    jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/ssm_crud
jdbc.user=root
jdbc.password=123456

    5.创建SpringMvc配置文件：dispatcherServlet-servlet.xml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <!--SpringMVC的配置文件，包含网站跳转逻辑的控制，配置  -->
    <context:component-scan base-package="com.wj" use-default-filters="false">
        <!--只扫描控制器。  use-default-filters="false  true为扫描所有-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--配置视图解析器，方便页面返回  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--两个标准配置  -->
    <!-- 将springmvc不能处理的请求交给tomcat -->
    <mvc:default-servlet-handler/>
    <!-- 能支持springmvc更高级的一些功能，JSR303校验，快捷的ajax...映射动态请求 -->
    <mvc:annotation-driven/>

</beans>

    6.创建mybatis逆向工程文件：mbg.xml

    <?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>

    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--阻止mbg生成注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!-- 配置数据库连接 -->
        <jdbcConnection
                driverClass="com.mysql.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/ssm_crud"
                userId="root"
                password="123456">
        </jdbcConnection>

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

        <!-- 指定javaBean生成的位置 -->
        <javaModelGenerator targetPackage="com.wj.crud.bean"
            targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- 指定dao接口生成的位置，mapper接口 -->
        <javaClientGenerator type="XMLMAPPER"
            targetPackage="com.wj.crud.dao" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>


        <!-- table指定每个表的生成策略 -->
        <table tableName="tbl_dept" domainObjectName="Department"></table>
        <table tableName="tbl_emp" domainObjectName="Employee"></table>

    </context>
</generatorConfiguration>

    在pom.xml 引入依赖包

    org.mybatis.generator
    mybatis-generator-core
    1.3.7

    以及创建MBGTest.java类
    MBG为mybatis逆向工程包 ：mybatis.generator

    作用：Mybatis Generator是Mybatis的代码生成工具，它根据数据库的表结构信息，逆向生成Java代码中对应的POJO类、DAO层以及映射文件等。对数据库的基本操作CRUD等都可以直接通过它创建的类调用完成，省去了手动写这些重复代码的工作。

    package com.wj.crud.test;

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;

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



public class MBGTest {

    public void mbg() throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("./src/main/resources/mbg.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);
    }
}

    自动生成文件如图所示：
    image.png

    上面的配置文件位置如图所示：
    image.png