参考官网
http://www.mybatis.org/generator/quickstart.html
pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.yangws</groupId>
    <artifactId>mybatis-generater</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>6.0.6</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

在resource目录创建generatorConfig.xml,内容如下

<?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="testTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--mysql数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/q4l3rntv?useSSL=false&amp;nullNamePatternMatchesAll=true" userId="hr"
                        password="hr">
        </jdbcConnection>

        <!--oracle配置-->
       <!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver" connectionURL="jdbc:oracle:thin:@localhost:1521:orcl"
            userId="nc65"
            password="sys">
        </jdbcConnection>-->

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，
        为 true时把JDBC DECIMAL和NUMERIC类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- targetProject:生成model类的位置，重要！！ -->
        <javaModelGenerator targetPackage="com.yonyou.hrcloud.orgfile.model" targetProject=".\src">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false"/>
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- targetProject:mapper映射xml文件生成的位置，重要！！ -->
        <sqlMapGenerator targetPackage="com.yonyou.hrcloud.orgfile.mapper"
                         targetProject=".\src">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- targetPackage：mapper接口生成的位置，重要！！ -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.yonyou.hrcloud.orgfile.dao"
                             targetProject=".\src">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

       <!-- 指定数据库表，mapperName:生成的dao和mapper文件的名字，domainObjectName：生成pojo的名字 -->
        <table tableName="sa_org_doc" mapperName="SaOrgDocDao" domainObjectName="SaOrgDoc"></table>
    </context>
</generatorConfiguration>

全部配置完成之后，双击maven插件中的：mybatis-generator:generate

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