自己做的电商网站要多少钱做网站怎么做

1.1.1 实体类id增加NotNull注释，并做分组校验

1.1.1.1 定义分组

1.1.1.2 实体类中指定校验项属于哪个分组

如果说某个校验项没有指定分组,默认属于Default分组
分组之间可以继承, A extends B  那么A中拥有B中所有的校验项

package com.geji.pojo;import com.fasterxml.jackson.annotation.JsonFormat;
import jakarta.validation.constraints.NotEmpty;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.groups.Default;
import lombok.Data;import java.time.LocalDateTime;@Data
public class Category {@NotNull(groups = Update.class)private Integer id;//主键ID@NotEmpty(groups={Add.class,Update.class})private String categoryName;//分类名称@NotEmpty(groups={Add.class,Update.class})private String categoryAlias;//分类别名private Integer createUser;//创建人ID@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")private LocalDateTime createTime;//创建时间@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")private LocalDateTime updateTime;//更新时间//如果说某个校验项没有指定分组,默认属于Default分组//分组之间可以继承, A extends B  那么A中拥有B中所有的校验项public interface Add extends Default {}public interface Update extends Default {}
}

1.1.1.3 Controller中指定校验分组

package com.geji.controller;import com.geji.pojo.Category;
import com.geji.pojo.Result;
import com.geji.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
@RequestMapping("/category")
public class CategoryController {@Autowiredprivate CategoryService categoryService;@PostMappingpublic Result add(@RequestBody @Validated(Category.Add.class) Category category) {categoryService.add(category);return Result.success();}@GetMappingpublic Result<List<Category>> list(){List<Category> cs = categoryService.list();return Result.success(cs);}@GetMapping("/detail")public Result<Category> detail(Integer id){Category c = categoryService.findById(id);return Result.success(c);}@PutMappingpublic Result update(@RequestBody @Validated(Category.Update.class) Category category){categoryService.update(category);return Result.success();}}

1.1.2 Service

package com.geji.service;import com.geji.pojo.Category;import java.util.List;public interface CategoryService {void add(Category category);List<Category> list();Category findById(Integer id);void update(Category category);
}

1.1.3 ServiceImpl

package com.geji.service.impl;import com.geji.mapper.CategoryMapper;
import com.geji.pojo.Category;
import com.geji.service.CategoryService;
import com.geji.utils.ThreadLocalUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;@Service
public class CategoryServiceImpl implements CategoryService {@Autowiredprivate CategoryMapper categoryMapper;@Overridepublic void add(Category category) {//补充属性值category.setCreateTime(LocalDateTime.now());category.setUpdateTime(LocalDateTime.now());Map<String,Object> map = ThreadLocalUtil.get();Integer userId = (Integer) map.get("id");category.setCreateUser(userId);categoryMapper.add(category);}@Overridepublic List<Category> list() {Map<String,Object> map = ThreadLocalUtil.get();Integer userId = (Integer) map.get("id");return categoryMapper.list(userId);}@Overridepublic Category findById(Integer id) {Category c = categoryMapper.findById(id);return c;}@Overridepublic void update(Category category) {category.setUpdateTime(LocalDateTime.now());categoryMapper.update(category);}}

1.1.4 Mapper

package com.geji.mapper;import com.geji.pojo.Category;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;import java.util.List;@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);//查询所有@Select("select * from category where create_user = #{userId}")List<Category> list(Integer userId);//根据id查询@Select("select * from category where id = #{id}")Category findById(Integer id);//更新@Update("update category set category_name=#{categoryName},category_alias=#{categoryAlias},update_time=#{updateTime} where id=#{id}")void update(Category category);}

1.1.5 postman测试