利用EasyExcel進行對錶格資料的寫入

阿新 • • 發佈：2020-07-14

一匯入依賴

<dependency>

   <groupId>com.alibaba</groupId>

   <artifactId>easyexcel</artifactId>

   <version>2.1.1</version>

</dependency>

二建立excel的實體類

package com.noob.eduservice.entity.vo;

import com.alibaba.excel.annotation.ExcelProperty;

import lombok.AllArgsConstructor;
 

import lombok.Data;

import lombok.NoArgsConstructor;

import org.springframework.stereotype.Component;

/**

 * Author: noob

 * DATE: 2020/7/13 0013

 * PROJECT: jiaoyu

 * DESCRIPTION: excel中對應的實體類

 **/

@Component

@Data

@AllArgsConstructor

@NoArgsConstructor

public class ExcelSubjectDate {

    @ExcelProperty(index = 0)
 

    private String OneSubjectName;

    @ExcelProperty(index = 1)

    private String TwoSubjectName;

}

三建立excel的監聽器

package com.noob.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;

import com.alibaba.excel.event.AnalysisEventListener;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 

import com.noob.eduservice.entity.EduSubject;

import com.noob.eduservice.entity.vo.ExcelSubjectDate;

import com.noob.eduservice.service.EduSubjectService;

import com.noob.exceptionHander.zdyException;

import lombok.AllArgsConstructor;

import lombok.NoArgsConstructor;

/**

 * Author: noob

 * DATE: 2020/7/13 0013

 * PROJECT: jiaoyu

 * DESCRIPTION: 讀取Excel檔案時的監聽器,SubjectExcelListener這個類不能被spring管理，需要用到無參構造

 **/

@NoArgsConstructor

@AllArgsConstructor

public class SubjectExcelListener extends AnalysisEventListener<ExcelSubjectDate>{

    private EduSubjectService eduSubjectService;

    /**

     * @Author noob

     * @Description //讀取excel中的內容，一行一行讀取加入資料庫中

     * @Param

     * @return

     **/

    @Override

    public void invoke(ExcelSubjectDate excelSubjectDate, AnalysisContext analysisContext) {

        if (excelSubjectDate == null){

            throw new zdyException(20001,"檔案異常");

        }

        //一行一行讀取，每次讀取兩個值

        //判斷一級分類是否相同

        EduSubject exitOneSubject = this.exitOneSubject(eduSubjectService, excelSubjectDate.getOneSubjectName());

        if (exitOneSubject == null){ //沒有這個一級分類進行新增

            exitOneSubject = new EduSubject();

            exitOneSubject.setParentId("0");

            exitOneSubject.setTitle(excelSubjectDate.getOneSubjectName());

            eduSubjectService.save(exitOneSubject);

        }

        //判斷二級分類

        String pid = exitOneSubject.getId();//獲取一級分類的id值

        EduSubject exitTwoSubject = this.exitTwoSubject(eduSubjectService, excelSubjectDate.getTwoSubjectName(), pid);

        if (exitTwoSubject == null){

            exitTwoSubject = new EduSubject();

            exitTwoSubject.setParentId(pid);

            exitTwoSubject.setTitle(excelSubjectDate.getTwoSubjectName());

            eduSubjectService.save(exitOneSubject);

        }

    }

    //判斷二級分類不能重複

    private EduSubject exitTwoSubject(EduSubjectService eduSubjectService,String name,String pid){

        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();

        wrapper.eq("title",name);

        wrapper.eq("parent_id",pid);

        EduSubject onesubject = eduSubjectService.getOne(wrapper);

        return onesubject;

    }

    //判斷一級分類不能重複

    private EduSubject exitOneSubject(EduSubjectService eduSubjectService,String name){

        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();

        wrapper.eq("title",name);

        wrapper.eq("parent_id",0);

        EduSubject twosubject = eduSubjectService.getOne(wrapper);

        return twosubject;

    }

    @Override

    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }

}

四進行測試

package com.noob.eduservice.controller;

import com.noob.commomutils.R;

import com.noob.eduservice.service.EduSubjectService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.CrossOrigin;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.multipart.MultipartFile;

/**

 * <p>

 * 課程科目 前端控制器

 * </p>

 *@Description

 * @author testjava

 * @since 2020-07-13

 */

@RestController

@RequestMapping("/edu/subject")

@CrossOrigin

public class EduSubjectController {

    @Autowired

    private EduSubjectService eduSubjectService;

    /**

     * @Author noob

     * @Description //新增課程分類,獲取上傳過來的檔案進行讀取

     * @Param file:上傳的檔案

     * @return

     **/

    @PostMapping("addsubject")

    public R  addSubject(MultipartFile file){

        eduSubjectService.saveSubject(file);

        return R.ok();

    }

}