MyBatis-Generator的官网地址

1、在项目的src/main/resources新建MyBatis-Generator的配置文件，如命名为mybatis-generator.xml，其内容如下：

<?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>

    <!--targetRuntime="MyBatis3Simple":生成简单版的CRUD;MyBatis3:豪华版 -->
    <context id="MyBatisGenerator" targetRuntime="MyBatis3">

        <!-- 生成的实体Bean,将实现Serializable -->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>

        <commentGenerator>
            <!-- 是否去除自动生成的注释 true:是 ; false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!-- jdbcConnection:连接数据库 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql://localhost:3306/spring" userId="root"
            password="root">
        </jdbcConnection>

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

        <!-- 生成model模型所对应的包路径,以及文件存放路径(targetProject);
            targetProject可以指定具体的路径,如./src/main/java,也可以使用“MAVEN”来自动生成,
            这样生成的代码会在target/generatord-source目录下 -->  
        <javaModelGenerator targetPackage="com.security.model"
            targetProject="./src/main/java">
            <property name="enableSubPackages" value="true" />
            <!--从数据库返回的值被清理前后的空格 --> 
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--对应的mapper.xml文件 -->
        <sqlMapGenerator targetPackage="com.security.dao"
            targetProject="./src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- 对应的Mapper接口类文件-->
        <javaClientGenerator type="XMLMAPPER"
            targetPackage="com.security.dao" targetProject="./src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 数据表与Bean的映射 -->
        <table tableName="user" domainObjectName="User" />
        <table tableName="department" domainObjectName="Department" />

    </context>
</generatorConfiguration>

 

2、自动生成代码的两种方式

2.1 利用Maven插件

• 在pom.xml中加入插件

<build>
        <plugins>
            <!-- 设置插件的依赖参数时请注意:
             1、所有引用的外部插件(比如分页插件)或者jar包,必须指定依赖 
             2、dependencies下每个依赖的jar必须指定version 
             3、如果generatorConfig.xml没有放在resources下,请指定generatorConfig.xml配置文件的路径 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <!-- 设置配置文件地址,默认地址为src/main/resources/generatorConfig.xml -->
                    <configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>

                <dependencies>
                    <!-- mybatis-generator -->
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.5</version>
                    </dependency>
                    <!-- mysql数据库连接 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.40</version>
                    </dependency>
                </dependencies>
            </plugin>

        </plugins>
    </build>

将鼠标放在项目工程上，点击右键，Run As –》Maven Build…，在Goals框内输入：mybatis-generator:generate 

2.2 利用Java代码

• 在pom.xml中加入项目依赖

<dependencies>

    <!-- MyBatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>

    <!-- mybatis-generator -->
    <dependency>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-core</artifactId>
        <version>1.3.5</version>
    </dependency>

    <!-- mysql数据库连接 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.40</version>
    </dependency>
</dependencies>

在测试文件中输入如下代码：

public class MyBatisGeneratorTest {

    @Test
    public void test() throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile =new File(this.getClass().getResource("/mybatis-generator.xml").getFile());
        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);
    }

}

参考文章：https://blog.csdn.net/feng15939178906/article/details/79904529?utm_source=distribute.pc_relevant.none-task