你应该使用Spring的BeanWrapper类。它支持嵌套属性，并可选择为您创建内部bean：

You should use Spring's BeanWrapper class. It supports nested properties, and optionally create inner beans for you:

BeanOne one = new BeanOne();
BeanWrapper wrapper = PropertyAccessorFactory.forBeanPropertyAccess(one);
wrapper.setAutoGrowNestedPaths(true);

Map<String, Object> map = new HashMap<>();
map.put("fieldOne", "fieldOneValue");
map.put("fieldTwo.fieldOne", "fieldOneValue");

wrapper.setPropertyValues(map);

assertEquals("fieldOneValue", one.getFieldOne());
BeanTwo two = one.getFieldTwo();
assertNotNull(two);
assertEquals("fieldOneValue", two.getFieldOne();

auto的杀手级功能通过 wrapper.setAutoGrowNestedPaths（true）来实现创建内部bean。默认值为false，这意味着你将获得 NullValueInNestedPathException 如果属性路径中的元素为null。

The killer feature of auto-creating inner beans is achieved thanks to wrapper.setAutoGrowNestedPaths(true). The default value is false, which means you will get a NullValueInNestedPathException if an element in the property path is null.