List <String> warnings = new ArrayList <String>();

boolean overwrite = true;

File configFile = new File("generator.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);

<?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="DB2Tables" targetRuntime="MyBatis3">

   <commentGenerator>

     <property name="suppressAllComments" value="true"></property>

   </commentGenerator>

    <!-- 设定数据库连接 -->

    <jdbcConnection driverClass="com.mysql.jdbc.Driver"

        connectionURL="jdbc:mysql://localhost:3306/mybatis"

        userId="root"

        password="123">

    </jdbcConnection>

    <javaTypeResolver >

      <property name="forceBigDecimals" value="false" />

    </javaTypeResolver>

    <!--  生成 bean 存放的位置  -->

    <javaModelGenerator targetPackage="com.ujiuye.bean" targetProject=".\src">

      <property name="enableSubPackages" value="true" />

      <property name="trimStrings" value="true" />

    </javaModelGenerator>

    <!-- 生成的mapper文件的位置 -->

    <sqlMapGenerator targetPackage="com.ujiuye.mapper"  targetProject=".\src">

      <property name="enableSubPackages" value="true" />

    </sqlMapGenerator>

    <!-- 生成的mapper.xml 对应的那个mapper接口的存放位置  -->

    <javaClientGenerator type="XMLMAPPER" targetPackage="com.ujiuye.mapper"  targetProject=".\src">

      <property name="enableSubPackages" value="true" />

    </javaClientGenerator>

    <!-- 设定反向生成的表 -->

    <table tableName="Person"></table>

    <table tableName="car"></table>

    <table tableName="card"></table>

  </context>

</generatorConfiguration>