「java」IntrospectorでObject型からMapへキャストするサンプル

2017年9月18日

Javaコード:
class IntrospectorDemo {

public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
if (map == null)
return null;

Object obj = beanClass.newInstance();

BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
Method setter = property.getWriteMethod();
if (setter != null) {
setter.invoke(obj, map.get(property.getName()));
}
}

return obj;
}

public static Map<String, Object> objectToMap(Object obj) throws Exception {
if(obj == null)
return null;

Map<String, Object> map = new HashMap<String, Object>();

BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
if (key.compareToIgnoreCase(“class") == 0) {
continue;
}
Method getter = property.getReadMethod();
Object value = getter!=null ? getter.invoke(obj) : null;
map.put(key, value);
}

return map;
}

}