GET /companies #获取company列表
GET /companies/1 #获取某个具体company
GET /companies/1/employees #获取某个具体company下所有employee列表
GET /companies/page/1/pageSize/5 #分页查询,page等于1,pageSize等于5
POST /companies #增加一个company
PUT /companies/1 #更新某个company
DELETE /companies/1 #删除某个company以及名下所有employees
GET /employees #获取employee列表
GET /employees/1 #获取某个具体employee
GET /employees/page/1/pageSize/5 #分页查询,page等于1,pageSize等于5
GET /employees/male #筛选出所有男性Employee
POST /employees #增加一个employee
PUT /employees/1 #更新某个employee
DELETE /employees/1 #删除某个employee