新增文章分类

pojo.Category

package com.lin.springboot01.pojo;import jakarta.validation.constraints.NotEmpty;
import lombok.Data;import java.time.LocalDateTime;@Data
public class Category {private Integer id;//主键@NotEmptyprivate String categoryName;//分类名称@NotEmptyprivate String categoryAlias;//分类别名private Integer createUser;//创建人IDprivate LocalDateTime createTime;//创建时间private LocalDateTime updateTime;//更新时间
}

controller.CategoryController

package com.lin.springboot01.controller;import com.lin.springboot01.pojo.Category;
import com.lin.springboot01.pojo.Result;
import com.lin.springboot01.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
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;//@RestController注解，相当于@Controller+@ResponseBody两个注解的结合，
// 返回json数据不需要在方法前面加@ResponseBody注解了，
// 但使用@RestController这个注解，就不能返回jsp,html页面，视图解析器无法解析jsp,html页面
@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;@PostMapping//@RequestBody,请求参数形式必须是json格式，表格提单不可以用。去掉就可以使用表单提交，不能用json提交public Result add(@RequestBody @Validated Category category){categoryService.add(category);return Result.success();}
}

service.CategoryService

package com.lin.springboot01.service;import com.lin.springboot01.pojo.Category;public interface CategoryService {void add(Category category);
}

service.impl.CategoryServiceImpl

package com.lin.springboot01.service.impl;import com.lin.springboot01.mapper.CategoryMapper;
import com.lin.springboot01.pojo.Category;
import com.lin.springboot01.service.CategoryService;
import com.lin.springboot01.utils.ThreadLocalUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.time.LocalDateTime;
import java.util.Map;@Service
public class CategoryServiceImpl implements CategoryService {@Autowiredprivate CategoryMapper categoryMapper;@Overridepublic void add(Category category) {category.setCreateTime(LocalDateTime.now());category.setUpdateTime(LocalDateTime.now());Map<String,Object> map = ThreadLocalUtil.get();Integer id = (Integer) map.get("id");category.setCreateUser(id);categoryMapper.add(category);}
}

mapper.CategoryMapper

package com.lin.springboot01.mapper;import com.lin.springboot01.pojo.Category;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;@Mapper
public interface CategoryMapper {//新增@Insert("insert into category(category_name,category_alias,create_user,create_time,update_time) values (" +"#{categoryName},#{categoryAlias},#{createUser},#{createTime},#{updateTime })")void add(Category category);
}

完成：