java 递归查询部门，子部门及下属用户列表

1 表结构如下

2.代码如下：controller方法

 @GetMapping(value = "/getAllDepartment")
    public String getAllDepartment() {
        List<Department> departments = departmentDao.selectByParentId(0);
        List<DepartmentResp> list = new ArrayList<>();
        if (departments.size() > 0) {
            departments.stream().forEach(department -> {
                DepartmentResp departmentResp = new DepartmentResp();
                departmentResp.setId(department.getId());
                departmentResp.setParentId(department.getParentId());
                departmentResp.setName(department.getName());
                List<DepartmentResp> children = getChildren(department.getId());
                departmentResp.setFlag(children.size()>0);
                departmentResp.setChildrenList(children);
                //查询当前人
                List<User> users = userDao.selectByDepartmentId(department.getId());
                departmentResp.setUserList(users);
                list.add(departmentResp);
            });
        }
        String s = JSONObject.toJSONString(list);
        return s;
    }

    public List<DepartmentResp> getChildren(Integer parentId) {
        List<DepartmentResp> list = new ArrayList<>();
        List<Department> departments = departmentDao.selectByParentId(parentId);
        departments.stream().forEach(department -> {
            DepartmentResp departmentResp = new DepartmentResp();
            departmentResp.setId(department.getId());
            departmentResp.setParentId(department.getParentId());
            departmentResp.setName(department.getName());
            List<DepartmentResp> children = getChildren(department.getId());
            departmentResp.setFlag(children.size()>0);
            departmentResp.setChildrenList(children);
            //查询当前人
            List<User> users = userDao.selectByDepartmentId(department.getId());
            departmentResp.setUserList(users);
            list.add(departmentResp);
        });
        return list;
    }

3. 返回实体类和部门实体类

@Data
@Table(name = "department")
public class Department {
    @Id
    private Integer id;
    private Integer parentId;
    private String name;
}

@Data
public class DepartmentResp {
    private Integer id;

    private Integer parentId;

    private String name;

    private boolean flag=false;

    private List<DepartmentResp> childrenList;

    private List<User> userList;
}