Springboot+vue前後端分離專案,poi匯出excel提供使用者下載的解決方案

簡易程式碼 發表於 2021-11-11
Vue Spring Excel

因為我們做的是前後端分離專案 無法採用response.write直接將檔案流寫出

我們採用阿里雲oss 進行儲存 再返回的結果物件裡面儲存我們的檔案地址

廢話不多說,上程式碼

Springboot

第一步匯入poi相關依賴

<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>4.1.2</version>
</dependency>
<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi-ooxml</artifactId>
   <version>4.1.2</version>
</dependency>
<dependency>
   <groupId>org.apache.poi</groupId>
   <artifactId>poi-ooxml-schemas</artifactId>
   <version>4.1.2</version>
</dependency>

第二步編寫批量匯出api

student物件

@Data
public class StudentDto {
    @JsonDeserialize(using = LongJsonDeserializer.class)
    @JsonSerialize(using = LongJsonSerializer.class)
    private Long id;
    private String name;
    private String studentId;
    private String collegename;
    private int collegeId;
    private int classId;
    private String classname;
    private Integer role;
    private String email;
    private String phone;
}

阿里雲oss檔案上傳的service(不會使用阿里雲oss的可以檢視 https://www.cnblogs.com/jydm/p/14745418.html)

    @Override
    public String uploadFileXlsx(InputStream inputStream, String own,String fileName) throws Exception {
        OSS ossClient = OssUtil.getossClient();
        //這裡最好對檔案路徑或名字做一下處理,防止檔名或路徑重複導致檔案丟失或者被覆蓋
        String url ="pm/"+own+"/"+fileName+".xlsx";
        //上傳
        ossClient.putObject(OssProperies.BUCKET_NAME, url, inputStream);
        // 關閉OSSClient。
        ossClient.shutdown();
        return "https://"+OssProperies.BUCKET_NAME+"."+OssProperies.END_POINT+"/"+url;
    }

 

Controller

    @ApiOperation("匯出學生資訊")
    @PostMapping("/exportStudents")
    @RequiresRoles("admin")
    public Result exportStudents(@RequestBody String students){
//將前端傳遞的json資料轉換為物件陣列 JSONObject jsonObject
= JSONObject.parseObject(students); List<StudentDto> studentDtos = JSONObject.parseArray(jsonObject.getJSONArray("students").toJSONString(), StudentDto.class);
//建立excel工作表 Workbook workbook
=new XSSFWorkbook(); Sheet studentsheet = workbook.createSheet("學生資訊表"); Row row = studentsheet.createRow(0); String[] title= {"學號","姓名","學院","班級","電話","郵箱"}; for (int i = 0; i < 6; i++) { Cell cell = row.createCell(i); cell.setCellValue(title[i]); } for (int i = 1; i < studentDtos.size()+1; i++) { StudentDto studentDto = studentDtos.get(i - 1); Row row1 = studentsheet.createRow(i); Cell cell0 = row1.createCell(0); cell0.setCellValue(studentDto.getStudentId()); Cell cell1 = row1.createCell(1); cell1.setCellValue(studentDto.getName()); Cell cell2 = row1.createCell(2); cell2.setCellValue(studentDto.getCollegename()); Cell cell3 = row1.createCell(3); cell3.setCellValue(studentDto.getClassname()); Cell cell4 = row1.createCell(4); cell4.setCellValue(studentDto.getPhone()); Cell cell5 = row1.createCell(5); cell5.setCellValue(studentDto.getEmail()); } InputStream excelStream = null; String path=null; try {
//這裡就是io流的轉換 WorkBook需要寫入一個輸出流 阿里雲oss儲存檔案需要一個輸入流 ByteArrayOutputStream out
= new ByteArrayOutputStream(); workbook.write(out); out.close(); excelStream= new ByteArrayInputStream(out.toByteArray()); workbook.close();
path
= fileService.uploadFileXlsx(excelStream, "admin", "學生資訊表"); } catch (Exception e) { e.printStackTrace(); } HashMap<Object, Object> map = new HashMap<>(); map.put("url",path); return Result.succ(map); }

這樣我們就返回給前端我們的一個檔案地址

vue前端處理

我們請求完成之後可以設定一個彈出框 詢問使用者是否需要下載 然後將 window.location.href 指向我們的檔案地址

或者請求結果返回為請求成功,直接將window.location.href 指向我們的檔案地址

async exportExcel(){
    const{data:res}=await  this.$axios.post("/student/exportStudents",{students:this.multipleSelection})
    console.log(res)
    if(res.code==200){
       this.$confirm('匯出成功,是否下載到電腦', '提示', {
          confirmButtonText: '確定',
          cancelButtonText: '取消',
          type: 'success'
        }).then(() => {
       window.location.href=res.data.url
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消'
          });          
        });
    }
 }

 這樣我們就實現了 springboot+vue前後端分離專案 批量匯出功能

附阿里雲oss購買渠道 https://www.aliyun.com/activity/1111?userCode=8crnx4b5 

Springboot+vue前後端分離專案,poi匯出excel提供使用者下載的解決方案

 

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