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//一级分类
@Data
public class OneSubject {
private String id;
private String title;
private List<TwoSubject> children=new ArrayList<>(); //一个一级分类对应多个二级分类
}
//二级
@Data
public class TwoSubject {
private String id;
private String title;
}
@GetMapping("subjectList")
public R subjectList(){
List<OneSubject> data=subjectService.getOneTwoSubject();
return R.ok().data("list",data);
}
接口
//获取分类列表
List<OneSubject> getOneTwoSubject();
实现类
//获取分类列表 @Override public List<OneSubject> getOneTwoSubject() { //1.获取一级分类列表 QueryWrapper<EduSubject> OneWrapper=new QueryWrapper<>(); OneWrapper.eq("parent_id", "0"); List<EduSubject> eduOneSubject = baseMapper.selectList(OneWrapper); //2.查询二级分类列表 QueryWrapper<EduSubject> TwoWrapper=new QueryWrapper<>(); OneWrapper.ne("parent_id", "0"); List<EduSubject> eduTwoSubject = baseMapper.selectList(TwoWrapper); //3.封装一级分类 List<OneSubject> finalOneSubject=new ArrayList<>(); for (int i = 0; i < eduOneSubject.size(); i++) { EduSubject eduSubjectOne = eduOneSubject.get(i); OneSubject oneSubject = new OneSubject();// BeanUtils.copyProperties(eduSubjectOne, oneSubject); finalOneSubject.add(oneSubject); //4.封装二级分类 List<TwoSubject> finalTwoSubject=new ArrayList<>(); for (int m = 0; m < eduTwoSubject.size(); m++) { EduSubject eduSubjectTwo = eduTwoSubject.get(m); if(eduSubjectTwo.getParentId().equals(eduSubjectOne.getId())){ TwoSubject twoSubject=new TwoSubject(); BeanUtils.copyProperties(eduSubjectTwo, twoSubject); finalTwoSubject.add(twoSubject); } } oneSubject.setChildren(finalTwoSubject); } return finalOneSubject; }
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