技術標籤：java

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class EntityUtils {
	/**
	 * 
	 * @description: 實體類轉Map
	 * @param object
	 * @return
	 */
	public static Map<String, Object> entityToMap(Object object) {
		Map<String, Object> map = new HashMap
 
<>();
		for (Field field : object.getClass().getDeclaredFields()) {
			try {
				boolean flag = field.isAccessible();
				field.setAccessible(true);
				Object o = field.get(object);
				map.put(field.getName(), o);
				field.setAccessible(flag);
			} catch (Exception e) {
				e.printStackTrace
 
();
			}
		}
		return map;
	}

	/**
	 * 
	 * @description: Map轉實體類
	 * @param <T>
	 * @param map    需要初始化的資料，key欄位必須與實體類的成員名字一樣，否則賦值為空
	 * @param entity 需要轉化成的實體類
	 * @return
	 */
	public static <T> T mapToEntity(Map<String, Object> map, Class<T> entity) {
		T t = null;
		try {
 

			t = entity.newInstance();
			for (Field field : entity.getDeclaredFields()) {
				if (map.containsKey(field.getName())) {
					boolean flag = field.isAccessible();
					field.setAccessible(true);
					Object object = map.get(field.getName());
					if (object != null && field.getType().isAssignableFrom(object.getClass())) {
						field.set(t, object);
					}
					field.setAccessible(flag);
				}
			}
			return t;
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
		return t;
	}
    public  <T> T convertMapToBean(Class<T> clazz, Map<String,Object> map) {
        T obj = null;
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
            obj = clazz.newInstance(); // 建立 JavaBean 物件


            // 給 JavaBean 物件的屬性賦值
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (int i = 0; i < propertyDescriptors.length; i++) {
                PropertyDescriptor descriptor = propertyDescriptors[i];
                String propertyName = descriptor.getName();
                if (map.containsKey(propertyName)) {
                    // 下面一句可以 try 起來，這樣當一個屬性賦值失敗的時候就不會影響其他屬性賦值。
                    Object value = map.get(propertyName);
                    if ("".equals(value)) {
                        value = null;
                    }
                    Object[] args = new Object[1];
                    args[0] = value;
                    descriptor.getWriteMethod().invoke(obj, args);
                }
            }
        } catch (IllegalAccessException e) {
            logger.error("convertMapToBean 例項化JavaBean失敗 Error{}" ,e);
        } catch (IntrospectionException e) {
            logger.error("convertMapToBean 分析類屬性失敗 Error{}" ,e);
        } catch (IllegalArgumentException e) {
            logger.error("convertMapToBean 對映錯誤 Error{}" ,e);
        } catch (InstantiationException e) {
            logger.error("convertMapToBean 例項化 JavaBean 失敗 Error{}" ,e);
        }catch (InvocationTargetException e){
            logger.error("convertMapToBean欄位對映失敗 Error{}" ,e);
        }catch (Exception e){
            logger.error("convertMapToBean Error{}" ,e);
        }
        return (T) obj;
    }
}