MyBatis逆向工程可以方便的從資料庫中將表自動對映到JAVA POJO類，並同時生成Mapper.xml和Mapper介面，方便實用。下面介紹一下逆向工程的使用方法。

        使用逆向工程，我們最好是新建一個JAVA Project，而不要直接在專案工程中進行，以免造成不好的後果。新建一個JAVA Project，匯入需要的JAR包，搭建成如下圖所示的樣子：

        GeneratorConfig.xml檔案中寫入如下程式碼：

<?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="MybatisGenerator" targetRuntime="MyBatis3">
		<commentGenerator>
			<!-- 是否去除自動生成的註釋，true是，false否 -->
			<property name="supressAllComments" value="true" />
		</commentGenerator>

		<!-- 資料庫連線資訊：驅動類、連線地址、使用者名稱、密碼 -->
		<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
			connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC"
			userId="root" password="123456">
		</jdbcConnection>

		<!-- 預設值 -->
		<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>

		<!-- 生成的po實體類的存放位置 -->
		<javaModelGenerator targetPackage="po"
			targetProject=".\src">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
		</javaModelGenerator>

		<!-- 生成的mapper對映檔案（XML檔案）的存放位置 -->
		<sqlMapGenerator targetPackage="mapper" targetProject=".\src">
			<property name="enableSubPackages" value="false" />
		</sqlMapGenerator>

		<!-- 生成的mapper介面（JAVA檔案）的存放位置 -->
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="mapper" targetProject=".\src">
			<property name="enableSubPackages" value="false" />
		</javaClientGenerator>

		<!-- 指定資料庫表 -->
		<table tableName="items" />
		<table tableName="users" />
		<table tableName="orders" />
		<table tableName="orderdetail" />
	</context>
</generatorConfiguration>
 

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

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;

public class MyGenerator {
	public void generate() throws Exception {
		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		File configFile = new File("GeneratorConfig.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);
	}

	public static void main(String[] args) throws Exception {
		try {
			MyGenerator myGenerator = new MyGenerator();
			myGenerator.generate();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}