Java递归生成树形菜单结构的json
- 1.数据class
- 2.获取数据方法
- 3. 组装数据的的递归方法
- 4. 案例
- 5. 结果输出
1.数据class
Dept.java
public class Dept {/** uuid */private String id;/** 部门名称 */private String name;/** 父id */private String parentId;private List<MfjcDeptVo> children;public MfjcDeptVo(String id, String name, String parentId) {this.id = id;this.name = name;this.parentId = parentId;}
}
2.获取数据方法
private List<Dept> getListDept(){List<Dept> deptList = new ArrayList<>();deptList.add(new Dept("001","一级部门1","0"));deptList.add(new Dept("009","一级部门2","0"));deptList.add(new Dept("002","二级部门1","001"));deptList.add(new Dept("003","三级部门1","002"));deptList.add(new Dept("004","二级部门2","001"));deptList.add(new Dept("005","三级部门2","002"));deptList.add(new Dept("006","二级部门3","001"));deptList.add(new Dept("007","三级部门3","002"));deptList.add(new Dept("008","三级部门4","002"));return deptList;
}
3. 组装数据的的递归方法
private List<Dept> deepCategory(String id, List<Dept> deptList){List<Dept> result = new ArrayList<>();deptList.forEach(x ->{if (id.equals(x.getParentId())){List<Dept> dept = this.deepCategory(x.getId(), deptList);x.setChildren(dept);result.add(x);}});return result;
}
4. 案例
public String getDept(){List<Dept> deptList = getListDept();List<Dept> deptListTree = deepCategory("0", deptList);String jsonString = JSONObject.toJSONString(deptListTree);System.out.println(jsonString); //输出结果请看第5部分return jsonString;
}private List<Dept> getListDept(){List<Dept> deptList = new ArrayList<>();deptList.add(new Dept("001","一级部门1","0"));deptList.add(new Dept("009","一级部门2","0"));deptList.add(new Dept("002","二级部门1","001"));deptList.add(new Dept("003","三级部门1","002"));deptList.add(new Dept("004","二级部门2","001"));deptList.add(new Dept("005","三级部门2","002"));deptList.add(new Dept("006","二级部门3","001"));deptList.add(new Dept("007","三级部门3","002"));deptList.add(new Dept("008","三级部门4","002"));return deptList;
}private List<Dept> deepCategory(String id, List<Dept> deptList){List<Dept> result = new ArrayList<>();deptList.forEach(x ->{if (id.equals(x.getParentId())){List<Dept> dept = this.deepCategory(x.getId(), deptList);x.setChildren(dept);result.add(x);}});return result;
}
5. 结果输出
[{"children": [{"children": [{"children": [],"id": "003","name": "三级部门1","parentId": "002"},{"children": [],"id": "005","name": "三级部门2","parentId": "002"},{"children": [],"id": "007","name": "三级部门3","parentId": "002"},{"children": [],"id": "008","name": "三级部门4","parentId": "002"}],"id": "002","name": "二级部门1","parentId": "001"},{"children": [],"id": "004","name": "二级部门2","parentId": "001"},{"children": [],"id": "006","name": "二级部门3","parentId": "001"}],"id": "001","name": "一级部门1","parentId": "0"},{"children": [],"id": "009","name": "一级部门2","parentId": "0"}
]
)
