1.routes 中：
GET /books controllers.BooksController.index
GET /books/create controllers.BooksController.create()
GET /books/:id controllers.BooksController.show(id :Integer)
GET /books/edit/:id controllers.BooksController.edit(id:Integer)
POST /books/edit controllers.BooksController.update()
POST /books/create controllers.BooksController.save()
GET /books/delete/:id controllers.BooksController.destroy(id:Integer)
2.测试：localhost:9000/books,有回应此时还没有内容模型
