java 使用BeanInfo实现bean实体与map之间的互相转换。

BeanInfo接口提供有关其 bean 的显式信息的 bean 实现者可以提供某个 BeanInfo 类，该类实现此 BeanInfo 接口并提供有关其 bean 的方法、属性、事件等显式信息。

例子：

map转实体

/**

* @param map

* @return

* @throws IllegalAccessException

* @throws IllegalArgumentException

* @throws InvocationTargetException

* @throws IntrospectionException

*/

private User mapTransformToBean(Map 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对应的setter方法

Method setter = property.getWriteMethod();

setter.invoke(user, value);

}

}

return user;

}

实体转map

/**

* @param user

* @return

* @throws IllegalAccessException

* @throws IllegalArgumentException

* @throws InvocationTargetException

* @throws IntrospectionException

*/

private Map beanTransformToMap(User user) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IntrospectionException{

Map map = new HashMap();

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

PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

for (PropertyDescriptor property : propertyDescriptors) {

String key = property.getName();

// 过滤class属性

if (!key.equals("class")) {

// 得到property对应的getter方法

Method getter = property.getReadMethod();

Object value = getter.invoke(user);

map.put(key, value);

}

}

return map;

}