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Mybatis 逆向工程能够很大的节约开发时间，需要学会使用。下面直接开始

第一步在项目文件下创建一个逆向工程的mbg.xml的配置文件，内容如下：

<?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">
        <!--生成没有注释的bean-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库连接信息-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/api_com"
                        userId="api_com"
                        password="api_com">
        </jdbcConnection>

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

        <!--生成javabean位置-->
        <javaModelGenerator targetPackage="com.lzqapi.app.v1.pojo" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--mapper xml文件路径-->
        <sqlMapGenerator targetPackage="mapper"  targetProject=".\src\main\resources\com\lzqapi\app\v1">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--指定DAO接口文件路径-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.lzqapi.app.v1.dao"  targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--指定表和java文件-->
        <table schema="DB2ADMIN" tableName="app_user" domainObjectName="User" >
        </table>

    </context>
</generatorConfiguration>

第二步执行如下java代码：

public class MBGTest {
    @Test
    public void generator() throws Exception{
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("mbg.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);
    }
}