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java 使用BeanInfo實現bean實體與map之間的互相轉換。
BeanInfo接口提供有關其 bean 的顯式信息的 bean 實現者可以提供某個 BeanInfo 類，該類實現此 BeanInfo 接口並提供有關其 bean 的方法、屬性、事件等顯式信息。

例子：

map轉實體

/**
* @param map
* @return
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws InvocationTargetException

* @throws IntrospectionException
*/
private User mapTransformToBean(Map<String, Object> map) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IntrospectionException{

User user=new User();
BeanInfo beanInfo = Introspector.getBeanInfo(user.getClass());

PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
if (map.containsKey(key)) {
Object value = map.get(key);
//得到property對應的setter方法
Method setter = property.getWriteMethod();
setter.invoke(user, value);
}
}
return user;
}

實體轉map

/**
* @param user
* @return
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws InvocationTargetException
* @throws IntrospectionException
*/
private Map<String, Object> beanTransformToMap(User user) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IntrospectionException{

Map<String, Object> map = new HashMap<String, Object>();
BeanInfo beanInfo = Introspector.getBeanInfo(user.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
// 過濾class屬性
if (!key.equals("class")) {
// 得到property對應的getter方法
Method getter = property.getReadMethod();
Object value = getter.invoke(user);
map.put(key, value);
}
}
return map;
}

java 可以使用BeanInfo實現bean實體與map之間的互相轉換