4.5、创建service层

package com.wzy.jdbctemplate.service;
import com.wzy.jdbctemplate.dao.BookDao;
import com.wzy.jdbctemplate.pojo.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class BookService {
    @Autowired
    private BookDao bookDao;
    public void addBook(Book book) {
      bookDao.insertBook(book);
    };
}