<dependency>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-core</artifactId>
    <version>1.4.1</version>
</dependency>

<?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>
  <!-- 數(shù)據(jù)庫連接信息 -->
  <context id="DB2Tables" targetRuntime="MyBatis3Simple">
    <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                    connectionURL="jdbc:mysql://localhost:3306/your_database"
                    userId="root"
                    password="password">
    </jdbcConnection>

    <!-- 生成的實(shí)體類等代碼的目標(biāo)位置 -->
    <javaModelGenerator targetPackage="com.example.entity" targetProject="src/main/java">
    </javaModelGenerator>

    <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
    </sqlMapGenerator>

    <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.mapper" targetProject="src/main/java">
    </javaClientGenerator>

    <!-- 指定要生成代碼的數(shù)據(jù)庫表 -->
    <table tableName="users" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
    </table>
  </context>
</generatorConfiguration>

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

        for (String warning : warnings) {
            System.out.println(warning);
        }
    }
}

public class User {
    private Integer id;

    private String name;

    private Integer age;

    // getter 和 setter 方法
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

<?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 https://maven.apache.org/xsd/maven -4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>
</project>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
    <version>2.3.32</version>
</dependency>

package ${package}.entity;

public class ${className} {
    <#list table.columns as column>
    // ${column.comments}
    private ${column.javaType} ${column.javaField};

    public ${column.javaType} get${column.javaCap}() {
        return this.${column.javaField};
    }

    public void set${column.javaCap}(${column.javaType} ${column.javaField}) {
        this.${column.javaField} = ${column.javaField};
    }
    </#list>
}

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

public class CodeGenerator {
    public static void main(String[] args) {
        // 配置 FreeMarker
        Configuration cfg = new Configuration(Configuration.VERSION_2_3_32);
        try {
            // 設(shè)置模板文件所在的目錄
            cfg.setDirectoryForTemplateLoading(new File("templates"));
            // 加載模板
            Template template = cfg.getTemplate("entity.ftl");
            // 創(chuàng)建數(shù)據(jù)模型
            Map<String, Object> dataModel = new HashMap<>();
            dataModel.put("package", "com.example");
            dataModel.put("className", "User");
            dataModel.put("table", getTableInfo());
            // 輸出代碼
            Writer out = new FileWriter(new File("src/main/java/com/example/entity/User.java"));
            template.process(dataModel, out);
            out.close();
        } catch (IOException | TemplateException e) {
            e.printStackTrace();
        }
    }

    // 模擬獲取表信息的方法
    public static Table getTableInfo() {
        Table table = new Table();
        table.setName("users");
        // 添加字段信息
        Column column1 = new Column();
        column1.setName("id");
        column1.setJavaType("Integer");
        column1.setJavaField("id");
        column1.setJavaCap("Id");
        column1.setComments("用戶 ID");

        Column column2 = new Column();
        column2.setName("name");
        column2.setJavaType("String");
        column2.setJavaField("name");
        column2.setJavaCap("Name");
        column2.setComments("用戶名字");

        Column column3 = new Column();
        column3.setName("age");
        column3.setJavaType("Integer");
        column3.setJavaField("age");
        column3.setJavaCap("Age");
        column3.setComments("用戶年齡");

        table.setColumns(new Column[]{column1, column2, column3});
        return table;
    }

    // Table 類用于封裝表信息
    public static class Table {
        private String name;
        private Column[] columns;

        // getter 和 setter 方法
        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public Column[] getColumns() {
            return columns;
        }

        public void setColumns(Column[] columns) {
            this.columns = columns;
        }
    }

    // Column 類用于封裝字段信息
    public static class Column {
        private String name;
        private String javaType;
        private String javaField;
        private String javaCap;
        private String comments;

        // getter 和 setter 方法
        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getJavaType() {
            return javaType;
        }

        public void setJavaType(String javaType) {
            this.javaType = javaType;
        }

        public String getJavaField() {
            return javaField;
        }

        public void setJavaField(String javaField) {
            this.javaField = javaField;
        }

        public String getJavaCap() {
            return javaCap;
        }

        public void setJavaCap(String javaCap) {
            this.javaCap = javaCap;
        }

        public String getComments() {
            return comments;
        }

        public void setComments(String comments) {
            this.comments = comments;
        }
    }
}

package com.example.entity;

public class User {
    // 用戶 ID
    private Integer id;

    // 用戶名字
    private String name;

    // 用戶年齡
    private Integer age;

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return this.age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}