【java集合互转】

bean转map

 /**
     * bean转map
     */
    public static <T> Map<String, Object> beanToMap(T bean) {
        Map<String, Object> map = new HashMap<>();
        if (bean != null) {
            BeanMap beanMap = BeanMap.create(bean);
            for (Object key : beanMap.keySet()) {
                map.put(key.toString(), beanMap.get(key));
            }
        }
        return map;
    }

List<Bean> 转 List<Map<String,Object>>

public static <T> List<Map<String, Object>> listBeanToListMap(List<T> src) {
        List<Map<String, Object>> mapList = null;
        if (CollectionUtils.isNotEmpty(src)) {
            mapList = Lists.newArrayListWithExpectedSize(src.size());
            Map<String, Object> oneLineData = null;
            T bean = null;
            for (int i = 0, size = src.size(); i < size; i++) {
                bean = src.get(i);
                oneLineData = beanToMap(bean);
                mapList.add(oneLineData);
            }
        }
        return mapList;
    }

字符串转JSONObject

 String s ="";
 JSONObject json = JSON.parseObject(s,JSONObject.class);

字符串转List<Entity>

List<Entity> list = JSON.parseArray(s,Entity.class);

Entity实体类转JSONObject

JSONObject json =(JSONObject)JSONObject .toJSON(Entity);

字符串转实体类

Entity entity = JSONObject .toJavaObject(s,Entity.class);

List转数组

List<Integer> list = Lists.newArrayList();
String[] strings = list.toArray(new String[list.size()]);

数组转集合

String[] strings = list.toArray(new String[list.size()]);
List<String> strings = Arrays.asList(strings);