基于ssm框架的书籍分类功能代码怎么编写

基于SSM框架的书籍分类功能代码可以按照以下步骤进行编写：

1. 创建数据库表：首先在数据库中创建书籍信息表和分类表。

2. 配置数据库连接和MyBatis框架：在项目中配置数据库连接和MyBatis框架，以实现对数据库的访问。

3. 编写实体类：根据数据库中的表结构，编写与之对应的Java实体类。

4. 编写Mapper文件：在MyBatis框架中，编写Mapper文件，实现对数据库的增删改查操作。

5. 编写Service接口和实现类：在Service层中，编写书籍分类功能的接口和实现类，实现书籍分类相关的业务逻辑。

6. 编写Controller类：在Controller层中，编写书籍分类相关的请求处理方法，接收前端请求，调用Service层的方法，返回响应结果。

以下是一个简单的示例：

1. 数据库表结构：

CREATE TABLE book (
    id INT(11) PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50),
    author VARCHAR(50),
    publisher VARCHAR(50),
    publish_date DATE,
    isbn VARCHAR(20),
    category_id INT(11)
);

CREATE TABLE category (
    id INT(11) PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50)
);

2. 实体类：

Book.java

public class Book {
    private int id;
    private String name;
    private String author;
    private String publisher;
    private Date publishDate;
    private String isbn;
    private int categoryId;
    // getter and setter methods
}

Category.java

public class Category {
    private int id;
    private String name;
    // getter and setter methods
}

3. Mapper文件：

BookMapper.xml

<mapper namespace="com.example.mapper.BookMapper">
    <insert id="insert" parameterType="Book">
        INSERT INTO book(name, author, publisher, publish_date, isbn, category_id)
        VALUES(#{name}, #{author}, #{publisher}, #{publishDate}, #{isbn}, #{categoryId})
    </insert>
    <delete id="deleteById" parameterType="int">
        DELETE FROM book WHERE id=#{id}
    </delete>
    <update id="update" parameterType="Book">
        UPDATE book SET name=#{name}, author=#{author}, publisher=#{publisher},
        publish_date=#{publishDate}, isbn=#{isbn}, category_id=#{categoryId}
        WHERE id=#{id}
    </update>
    <select id="findById" parameterType="int" resultType="Book">
        SELECT * FROM book WHERE id=#{id}
    </select>
    <select id="findByCategoryId" parameterType="int" resultType="Book">
        SELECT * FROM book WHERE category_id=#{categoryId}
    </select>
</mapper>

CategoryMapper.xml

<mapper namespace="com.example.mapper.CategoryMapper">
    <insert id="insert" parameterType="Category">
        INSERT INTO category(name) VALUES(#{name})
    </insert>
    <delete id="deleteById" parameterType="int">
        DELETE FROM category WHERE id=#{id}
    </delete>
    <update id="update" parameterType="Category">
        UPDATE category SET name=#{name} WHERE id=#{id}
    </update>
    <select id="findById" parameterType="int" resultType="Category">
        SELECT * FROM category WHERE id=#{id}
    </select>
    <select id="findByName" parameterType="String" resultType="Category">
        SELECT * FROM category WHERE name=#{name}
    </select>
</mapper>

4. Service接口和实现类：

BookService.java

public interface BookService {
    void addBook(Book book);
    void deleteBook(int id);
    void updateBook(Book book);
    Book getBookById(int id);
    List<Book> getBooksByCategoryId(int categoryId);
}

BookServiceImpl.java

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookMapper bookMapper;

    @Override
    public void addBook(Book book) {
        bookMapper.insert(book);
    }

    @Override
    public void deleteBook(int id) {
        bookMapper.deleteById(id);
    }

    @Override
    public void updateBook(Book book) {
        bookMapper.update(book);
    }

    @Override
    public Book getBookById(int id) {
        return bookMapper.findById(id);
    }

    @Override
    public List<Book> getBooksByCategoryId(int categoryId) {
        return bookMapper.findByCategoryId(categoryId);
    }
}

CategoryService.java

public interface CategoryService {
    void addCategory(Category category);
    void deleteCategory(int id);
    void updateCategory(Category category);
    Category getCategoryById(int id);
    Category getCategoryByName(String name);
}

CategoryServiceImpl.java

@Service
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private CategoryMapper categoryMapper;

    @Override
    public void addCategory(Category category) {
        categoryMapper.insert(category);
    }

    @Override
    public void deleteCategory(int id) {
        categoryMapper.deleteById(id);
    }

    @Override
    public void updateCategory(Category category) {
        categoryMapper.update(category);
    }

    @Override
    public Category getCategoryById(int id) {
        return categoryMapper.findById(id);
    }

    @Override
    public Category getCategoryByName(String name) {
        return categoryMapper.findByName(name);
    }
}

5. Controller类：

BookController.java

@Controller
@RequestMapping("/book")
public class BookController {
    @Autowired
    private BookService bookService;
    @Autowired
    private CategoryService categoryService;

    @GetMapping("/list")
    public String list(Model model, int categoryId) {
        List<Book> books = bookService.getBooksByCategoryId(categoryId);
        Category category = categoryService.getCategoryById(categoryId);
        model.addAttribute("books", books);
        model.addAttribute("category", category);
        return "book/list";
    }

    @GetMapping("/add")
    public String add(Model model) {
        List<Category> categories = categoryService.getAllCategories();
        model.addAttribute("categories", categories);
        return "book/add";
    }

    @PostMapping("/add")
    public String add(Book book) {
        bookService.addBook(book);
        return "redirect:/book/list?categoryId=" + book.getCategoryId();
    }

    @GetMapping("/edit")
    public String edit(Model model, int id) {
        Book book = bookService.getBookById(id);
        List<Category> categories = categoryService.getAllCategories();
        model.addAttribute("book", book);
        model.addAttribute("categories", categories);
        return "book/edit";
    }

    @PostMapping("/edit")
    public String edit(Book book) {
        bookService.updateBook(book);
        return "redirect:/book/list?categoryId=" + book.getCategoryId();
    }

    @GetMapping("/delete")
    public String delete(int id) {
        Book book = bookService.getBookById(id);
        bookService.deleteBook(id);
        return "redirect:/book/list?categoryId=" + book.getCategoryId();
    }
}

以上是一个简单的基于SSM框架的书籍分类功能代码示例，具体实现需要根据实际情况进行调整和优化。