業務處理

SubjectAdminController

@Api(description="課程分類管理") @CrossOrigin //跨域 @RestController @RequestMapping("/eduservice/subject") public class SubjectAdminController {@Autowiredprivate SubjectService subjectService;//添加課程分類@ApiOperation(value = "Excel批量導入")@PostMapping("addSubject")public R addSubject(MultipartFile file) {//1 獲取上傳的excel文件 MultipartFile//返回錯誤提示信息subjectService.importSubjectData(file,subjectService);//判斷返回集合是否為空return R.ok();} }

創建和Excel對應的實體類

import com.alibaba.excel.annotation.ExcelProperty; import lombok.Data;@Data public class ExcelSubjectData {@ExcelProperty(index = 0)private int oneSubjectName;@ExcelProperty(index = 1)private String twoSubjectName; }

SubjectService

（1）接口

void batchImport(MultipartFile file);

2）實現類

//添加課程分類 //poi讀取excel內容 @Override public void importSubjectData(MultipartFile file,EduSubjectService subjectService) {try {//1 獲取文件輸入流InputStream inputStream = file.getInputStream();// 這里 需要指定讀用哪個class去讀，然后讀取第一個sheet 文件流會自動關閉EasyExcel.read(inputStream, ExcelSubjectData.class, new SubjectExcelListener(subjectService)).sheet().doRead();}catch(Exception e) {e.printStackTrace();throw new Exception(20002,"添加課程分類失敗");} }

創建讀取Excel監聽器

import com.alibaba.excel.context.AnalysisContext; import com.alibaba.excel.event.AnalysisEventListener;import java.util.ArrayList; import java.util.List; import java.util.Map;public class SubjectExcelListener extends AnalysisEventListener<ExcelSubjectData> {public EduSubjectService subjectService;public SubjectExcelListener() {}//創建有參數構造，傳遞subjectService用于操作數據庫public SubjectExcelListener(EduSubjectService subjectService) {this.subjectService = subjectService;}//一行一行去讀取excle內容@Overridepublic void invoke(ExcelSubjectData user, AnalysisContext analysisContext) {if(user == null) {throw new Exception(20001,"添加失敗");}//添加一級分類EduSubject existOneSubject = this.existOneSubject(subjectService,user.getOneSubjectName());if(existOneSubject == null) {//沒有相同的existOneSubject = new EduSubject();existOneSubject.setTitle(user.getOneSubjectName());existOneSubject.setParentId("0");subjectService.save(existOneSubject);}//獲取一級分類id值String pid = existOneSubject.getId();//添加二級分類EduSubject existTwoSubject = this.existTwoSubject(subjectService,user.getTwoSubjectName(), pid);if(existTwoSubject == null) {existTwoSubject = new EduSubject();existTwoSubject.setTitle(user.getTwoSubjectName());existTwoSubject.setParentId(pid);subjectService.save(existTwoSubject);}}//讀取excel表頭信息@Overridepublic void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {System.out.println("表頭信息："+headMap);}//讀取完成后執行@Overridepublic void doAfterAllAnalysed(AnalysisContext analysisContext) {}//判斷一級分類是否重復private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();wrapper.eq("title",name);wrapper.eq("parent_id",pid);EduSubject eduSubject = subjectService.getOne(wrapper);return eduSubject;}//判斷一級分類是否重復private EduSubject existOneSubject(EduSubjectService subjectService,String name) {QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();wrapper.eq("title",name);wrapper.eq("parent_id","0");EduSubject eduSubject = subjectService.getOne(wrapper);return eduSubject;} }

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