笔者是从配置文件中读取JSON数组数据，类Metadata.class的结构如下：
public class Metadata { ???public String id; ???public String codeNo; ???public String codeName; ???public String parentNo; ???public String description; ???public String state; ???public List<Metadata> subordinates;}JSON数据文件menu.json内容：
[ ?{ ???"codeNo": "01", ???"codeName": "系统设置", ???"description": "系统设置模块", ???"metaState": "01", ???"parentNo": "", ???"subordinates": [ ?????{ ???????"codeNo": "0101", ???????"codeName": "角色管理", ???????"description": "角色管理菜单", ???????"metaState": "01", ???????"parentNo": "01", ???????"subordinates": [] ?????}, ?????{ ???????"codeNo": "0102", ???????"codeName": "账号管理", ???????"description": "账号管理菜单", ???????"metaState": "01", ???????"parentNo": "01", ???????"subordinates": [] ?????} ???] ?}, ?{ ???"codeNo": "02", ???"codeName": "用户管理", ???"description": "用户管理模块", ???"metaState": "01", ???"parentNo": "", ???"subordinates": [ ?????{ ???????"codeNo": "0201", ???????"codeName": "论坛用户", ???????"description": "论坛用户菜单", ???????"metaState": "01", ???????"parentNo": "02", ???????"subordinates": [] ?????} ???] ?}, ?{ ???"codeNo": "03", ???"codeName": "社区管理", ???"description": "内容管理模块", ???"metaState": "01", ???"parentNo": "", ???"subordinates": [ ?????{ ???????"codeNo": "0301", ???????"codeName": "帖子管理", ???????"description": "帖子管理菜单", ???????"metaState": "01", ???????"parentNo": "03", ???????"subordinates": [] ?????}, ?????{ ???????"codeNo": "0302", ???????"codeName": "版块管理", ???????"description": "版块管理菜单", ???????"metaState": "01", ???????"parentNo": "03", ???????"subordinates": [] ?????} ???] ?}]下面重点来了，分别采用两种方式读取：
/** 方式一：菜单列表 **/ ???public static final List<Metadata> menuList() { ???????return MENU_LIST; ???} ???private static List<Metadata> MENU_LIST; ???static { ???????InputStream is = null; ???????try { ???????????is = new ClassPathResource("/menu.json").getInputStream(); ???????????MENU_LIST = JsonUtils.parseArray(ByteUtils.string(is), Metadata.class); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????} finally { ???????????is.close(); ???????} ???}/** 方式二：菜单列表 **/ ???public static List<Metadata> menuList() { ???????InputStream is = null; ???????List<Metadata> menus = null; ???????try { ???????????is = new ClassPathResource("/menu.json").getInputStream(); ???????????menus = JsonUtils.parseArray(ByteUtils.string(is), Metadata.class); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????} finally { ???????????is.close(); ???????} ???????return menus; ???}两种当时产生的数据返回给前端时，第一种会产生循环依赖，而第二种则不会！希望在你们的评论中得到答案？
记一次JSON循环依赖的经历
原文地址：https://www.cnblogs.com/NguyenVm/p/9964984.html