apache beanutils
官方文档http://commons.apache.org/beanutils/apidocs/org/apache/commons/beanutils/package-summary.html#package_description
层次访问（Nested Property Access）
如String city = employee.getAddress("home").getCity();
可以写成String city = (String)
PropertyUtils.getNestedProperty(employee, "address(home).city");
bean转化成map
map = BeanUtils.describe(po);
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