categoryController

    @GetMapping
    public Result<List<Category>> list(){
        List<Category> cs = categoryService.list();
        return Result.success(cs);
    }

 categoryService

    //列表查询
    List<Category> list();

categoryServiceImpl

    @Override
    public List<Category> list() {
        Map<String,Object> map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");
        return categoryMapper.list(userId);
    }

categoryMapper

     //查询所有
    @Select("select * from category where create_user = #{userId}")
    List<Category> list(Integer userId);

pojo.Category

package com.lin.springboot01.pojo;

import com.fasterxml.jackson.annotation.JsonFormat;
import jakarta.validation.constraints.NotEmpty;
import lombok.Data;

import java.time.LocalDateTime;

@Data
public class Category {
    private Integer id;//主键
    @NotEmpty
    private String categoryName;//分类名称
    @NotEmpty
    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
}

成功：