删除独立的作者、出版社、缩略图表；修正部分字段；实现部分Service以及Controller；项目框架基本建立

bookshelfplus/src/main/java/plus/bookshelf/Service/Impl/BookServiceImpl.java

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+package plus.bookshelf.Service.Impl;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import plus.bookshelf.Dao.DO.BookDO;
+import plus.bookshelf.Dao.Mapper.BookDOMapper;
+import plus.bookshelf.Service.Model.BookModel;
+import plus.bookshelf.Service.Model.CategoryModel;
+import plus.bookshelf.Service.Service.BookService;
+import plus.bookshelf.Service.Service.CategoryService;
+
+@Service
+public class BookServiceImpl implements BookService {
+
+    @Autowired
+    private BookDOMapper bookDOMapper;
+
+    @Autowired
+    private CategoryService categoryService;
+
+    @Override
+    @Transactional
+    public BookModel getBookById(Integer id) {
+        // 查询得到bookDO
+        BookDO bookDO = bookDOMapper.selectByPrimaryKey(id);
+        // 查询得到categoryModel
+        CategoryModel categoryModel = categoryService.getCategoryById(bookDO.getCategoryId());
+
+        BookModel bookModel = convertFromDataObjecct(bookDO, categoryModel);
+        return bookModel;
+    }
+
+    private BookModel convertFromDataObjecct(BookDO bookDO, CategoryModel categoryModel) {
+        BookModel bookModel = new BookModel();
+        if (bookDO == null) {
+            return null;
+        }
+        bookModel.setId(bookDO.getId());
+        bookModel.setBookName(bookDO.getBookName());
+        bookModel.setDescription(bookDO.getDescription());
+        bookModel.setAuthor(bookDO.getAuthor());
+        bookModel.setCategory(categoryModel);
+        bookModel.setPublishingHouse(bookDO.getPublishingHouse());
+        bookModel.setCopyright(bookDO.getCopyright());
+        bookModel.setIsDelete(bookDO.getIsDelete());
+        bookModel.setThumbnail(bookDO.getThumbnail());
+        return bookModel;
+    }
+}