ssm图书管理系统中的分类管理代码

以下是基于SSM框架的图书分类管理代码：

1. 实体类 Category.java

public class Category {
    private Integer id;
    private String name;
    // getter和setter方法省略
}

2. DAO接口 CategoryMapper.java

public interface CategoryMapper {
    int deleteByPrimaryKey(Integer id);

    int insert(Category record);

    int insertSelective(Category record);

    Category selectByPrimaryKey(Integer id);

    int updateByPrimaryKeySelective(Category record);

    int updateByPrimaryKey(Category record);

    List<Category> selectAll();
}

3. DAO实现类 CategoryMapper.xml

<mapper namespace="com.example.mapper.CategoryMapper">
    <resultMap id="categoryMap" type="Category">
        <id column="id" property="id" />
        <result column="name" property="name" />
    </resultMap>

    <select id="selectAll" resultMap="categoryMap">
        SELECT * FROM category
    </select>

    <select id="selectByPrimaryKey" resultMap="categoryMap" parameterType="java.lang.Integer">
        SELECT * FROM category WHERE id = #{id}
    </select>

    <insert id="insert" parameterType="Category" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO category(name) VALUES(#{name})
    </insert>

    <update id="updateByPrimaryKeySelective" parameterType="Category">
        UPDATE category SET name = #{name} WHERE id = #{id}
    </update>

    <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
        DELETE FROM category WHERE id = #{id}
    </delete>
</mapper>

4. Service接口 CategoryService.java

public interface CategoryService {
    List<Category> listAll();

    Category findById(Integer id);

    void saveOrUpdate(Category category);

    void delete(Integer id);
}

5. Service实现类 CategoryServiceImpl.java

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

    @Override
    public List<Category> listAll() {
        return categoryMapper.selectAll();
    }

    @Override
    public Category findById(Integer id) {
        return categoryMapper.selectByPrimaryKey(id);
    }

    @Override
    public void saveOrUpdate(Category category) {
        if (category.getId() == null) {
            categoryMapper.insert(category);
        } else {
            categoryMapper.updateByPrimaryKeySelective(category);
        }
    }

    @Override
    public void delete(Integer id) {
        categoryMapper.deleteByPrimaryKey(id);
    }
}

6. Controller类 CategoryController.java

@Controller
@RequestMapping("/category")
public class CategoryController {
    @Autowired
    private CategoryService categoryService;

    @GetMapping("/list")
    public String list(Model model) {
        List<Category> categoryList = categoryService.listAll();
        model.addAttribute("categoryList", categoryList);
        return "category/list";
    }

    @GetMapping("/edit")
    public String edit(Integer id, Model model) {
        Category category = null;
        if (id != null) {
            category = categoryService.findById(id);
        } else {
            category = new Category();
        }
        model.addAttribute("category", category);
        return "category/edit";
    }

    @PostMapping("/saveOrUpdate")
    public String saveOrUpdate(Category category) {
        categoryService.saveOrUpdate(category);
        return "redirect:/category/list";
    }

    @GetMapping("/delete")
    public String delete(Integer id) {
        categoryService.delete(id);
        return "redirect:/category/list";
    }
}

以上就是SSM框架中图书分类管理的代码，其中包括实体类、DAO接口和实现、Service接口和实现、Controller类等。需要注意的是，这里只是示例代码，具体实现可能会有所不同。