添加jar包

配置GeneratorConfig.xml文件

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

		<!-- 数据库连接信息：驱动类、连接地址、用户名、密码 -->
		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
			connectionURL="jdbc:mysql://localhost:3306/elm" userId="root"
			password="a123456">
		</jdbcConnection>

		<!-- 默认值 -->
		<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>

		<!-- 生成的po实体类的存放位置 -->
		<javaModelGenerator targetPackage="com.qf.pojo"
			targetProject=".\src\main\java\">
			<!-- enableSubPackages:是否让schema作为包的后缀 -->
			<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>

		<!-- 生成的mapper映射文件（XML文件）的存放位置 -->
		<sqlMapGenerator targetPackage="com.qf.mapper" targetProject=".\src\main\java\">
			<property name="enableSubPackages" value="false" />
		</sqlMapGenerator>

		<!-- 生成的mapper接口（JAVA文件）的存放位置 -->
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="com.qf.dao" targetProject=".\src\main\java\">
			<property name="enableSubPackages" value="false" />
		</javaClientGenerator>
		<!-- 指定数据库表 -->
		<table tableName="ta_cart" />
		<table tableName="ta_goods" />
		<table tableName="ta_order" />
		<table tableName="ta_payments" />
		<table tableName="ta_power" />
		<table tableName="ta_roles" />
		<table tableName="ta_roles_power" />
		<table tableName="ta_shops" />
		<table tableName="ta_sites" />
		<table tableName="ta_tallys" />
		<table tableName="ta_user" />
		<table tableName="ta_user_roles" />
	</context>
</generatorConfiguration>

写执行代码

package com.qf.generator;

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

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

	public void generate() throws  Exception {
		ArrayList<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		File configFile = new File("src/main/resources/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);
	}
}