代码如下：
<settings>
    <!-- 映射下划线到驼峰命名 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!-- 开启延迟加载 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!-- 配置按需加载 -->
         <setting name="aggressiveLazyLoading" value="false"/>
         
         <setting name="lazyLoadTriggerMethods" value="toString()"/>
 </settings>

@Test
    public void testResultMapCascade() throws Exception{
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        
        SqlSession session = sqlSessionFactory.openSession();
        
        try {
            EmployeeMapperResultMap mapper = session.getMapper(EmployeeMapperResultMap.class);
            
            Employee employee = mapper.getEmpAndDeptByIdStep(1001);
            System.out.println(employee);
            
            System.out.println(employee.getDepartment());
            
        } finally {
            session.close();
        }
    }
各种方法都试了《要枯了。。。。。。