标签：NPU 重点 sub 循环 .class 设置 str ret trace
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？
标签：NPU 重点 sub 循环 .class 设置 str ret trace
原文地址：https://www.cnblogs.com/NguyenVm/p/9964984.html
