list转map工具类 List转换成Map工具类的简单实例

public class List2MapUtils {

	/**
	 * K: key class type, V: value class type
	 * 
	 * @param sourceList
	 * @param keyName
	 *      key property
	 * @param keyClass
	 *      key Class type
	 * @return
	 */
	public static <K, V> Map<K, V> convert2Map(List<V> sourceList, String keyName, Class<K> keyClass) {
		Map<K, V> map = new HashMap<K, V>();

		if (sourceList == null || sourceList.isEmpty()) {
			return map;
		}

		for (V value : sourceList) {

			BeanWrapper beanWrapper = PropertyAccessorFactory.forBeanPropertyAccess(value);
			beanWrapper.setAutoGrowNestedPaths(true);

			K key = keyClass.cast(beanWrapper.getPropertyValue(keyName));
			if (key == null) {
				continue;
			}
			map.put(key, value);
		}

		return map;
	}
}