mybatisplus如何生成实体类

Mybatis-plus可以通过代码生成器来生成实体类。具体步骤如下：

1. 在pom.xml中添加mybatis-plus-generator依赖

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.4.2</version>
</dependency>

2. 编写代码生成器配置文件generatorConfig.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="mysql" targetRuntime="MyBatis3">
        <!-- 数据库连接 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!-- 实体类生成的包名和位置 -->
        <javaModelGenerator targetPackage="com.example.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- mapper.xml文件生成的包名和位置 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- mapper接口生成的包名和位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- 表名和实体类名的映射 -->
        <table tableName="user" domainObjectName="User"></table>
    </context>
</generatorConfiguration>

3. 编写代码生成器

public class CodeGenerator {
    public static void main(String[] args) throws Exception {
        // 读取generatorConfig.xml配置文件
        InputStream inputStream = CodeGenerator.class.getResourceAsStream("/generatorConfig.xml");
        ConfigurationParser cp = new ConfigurationParser(new ArrayList<>());
        Configuration config = cp.parseConfiguration(inputStream);

        // 创建代码生成器
        DefaultShellCallback callback = new DefaultShellCallback(true);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, new ArrayList<>());

        // 执行生成代码
        myBatisGenerator.generate(null);
    }
}

4. 运行代码生成器，即可在指定的包名和位置下生成实体类、mapper接口和mapper.xml文件。