新增分类

需求分析：

后台系统中可以管理分类信息，分类包括两种信息，分别是菜品分类和套餐分类。当我们在后台系统中添加菜品时需要选择一个菜品分类，当我们在后台系统中添加一个套餐时需要选择一个套餐分类，在移动端也会按照菜品分类和套餐分类来展示对应的菜品和套餐

（1）实体类Category

package com.itheima.entity;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
import java.time.LocalDateTime;

/**
 * 分类
 */
@Data
public class Category implements Serializable {

    private static final long serialVersionUID = 1L;

    private Long id;


    //类型 1 菜品分类 2 套餐分类
    private Integer type;


    //分类名称
    private String name;


    //顺序
    private Integer sort;


    //创建时间
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;


    //更新时间
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;


    //创建人
    @TableField(fill = FieldFill.INSERT)
    private Long createUser;


    //修改人
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Long updateUser;


    //是否删除
    private Integer isDeleted;

}

（2）Mapper接口CategoryMapper

package com.itheima.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.itheima.entity.Category;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface CategoryMapper extends BaseMapper<Category> {
}

（3）业务层接口CategoryService

package com.itheima.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.itheima.entity.Category;

public interface CategoryService extends IService<Category> {
}

（4）业务层实现类CategoryServiceImpl

package com.itheima.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.entity.Category;
import com.itheima.mapper.CategoryMapper;
import com.itheima.service.CategoryService;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
}

（5）控制层CategoryController

package com.itheima.controller;

import com.itheima.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 分类管理
 */
@RestController
@RequestMapping("/category")
public class CategoryController {
    @Autowired
    private CategoryService categoryService;
}

新增份分类：

1、页面发送ajax请求，将新增分类窗口输入的数据以json形式提交到服务端

2、服务端Controller接收页面提交的数据并调用Service将数据进行保存

3、Service调用Mapper操作数据库，保存数据

package com.itheima.controller;

import com.itheima.common.R;
import com.itheima.entity.Category;
import com.itheima.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 分类管理
 */
@RestController
@RequestMapping("/category")
@Slf4j
public class CategoryController {
    @Autowired
    private CategoryService categoryService;

    /**
     * 新增分类
     * @param category
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody Category category){
        categoryService.save(category);
        log.info("category:{}", category);
        return R.success("新增分类成功");
    }

}