一文带你搞懂Go如何读写Excel文件

go get github.com/xuri/excelize

# Go Modules使用这个命令
go get github.com/xuri/excelize/v2

func WriteNewExcel() {
   f := excelize.NewFile()
   // 创建一个sheet
   index := f.NewSheet("Sheet2")
   // 根据sheet和坐标 确定一个值
   // 例如f.SetCellValue("Sheet2", "A2", "Hello world.")就是在Sheet表中A列第2行的格子里填入Hello world.
   f.SetCellValue("Sheet2", "A2", "Hello world.")
   f.SetCellValue("Sheet1", "B1", 100)
   f.SetCellValue("Sheet1", "B2", 100)
   // 将新的sheet添加到Excel中
   f.SetActiveSheet(index)
   // 保存Excel
   if err := f.SaveAs("Book1.xlsx"); err != nil {
      fmt.Println(err)
   }
}

func WriteExcel() {
   f, _ := excelize.OpenFile("Book1.xlsx")
   index := f.NewSheet("Sheet2")
   f.SetCellValue("Sheet2", "A2", "Hello world.")
   f.SetCellValue("Sheet1", "B1", 100)
   f.SetCellValue("Sheet1", "B2", 100)
   f.SetActiveSheet(index)
   if err := f.SaveAs("Book1.xlsx"); err != nil {
      fmt.Println(err)
   }
}

func ReadExcel() {
   f, err := excelize.OpenFile("Book1.xlsx")
   if err != nil {
      fmt.Println(err)
      return
   }
   defer func() {
      if err := f.Close(); err != nil {
         fmt.Println(err)
      }
   }()
   // 根据sheet和坐标读取某一个格子的值
   cell, err := f.GetCellValue("Sheet1", "B2")
   if err != nil {
      fmt.Println(err)
      return
   }
   fmt.Println(cell)
   // 按行读取全部
   rows, err := f.GetRows("Sheet1")
   if err != nil {
      fmt.Println(err)
      return
   }
   for _, row := range rows {
      for _, colCell := range row {
         fmt.Print(colCell, "\t")
      }
      fmt.Println()
   }
}

func HttpReadExcel() {
   f := func(read io.Reader) {
      file, err := excelize.OpenReader(read)
      if err != nil {
         fmt.Println(err)
         return
      }
      for _, item := range file.GetSheetList() {
         rows, _ := file.GetRows(item)
         // rows是一个二维数组
         for i := range rows {
            strs := rows[i]
            for j := range strs {
               str := rows[i][j]
               fmt.Println(str)
            }
         }
      }
   }
   http.HandleFunc("/excel", func(w http.ResponseWriter, r *http.Request) {
      file, _, err := r.FormFile("file")
      if err != nil {
         fmt.Println(err)
         return
      }
      fileBytes, err := ioutil.ReadAll(file)
      if err != nil {
         fmt.Println(err)
         return
      }
      reader := bytes.NewReader(fileBytes)
      f(reader)
      w.Write([]byte("Hello Http Get!"))
   })
   http.ListenAndServe(":8080", nil)
}

func HttpDownloadExcel() {
   fun := func(fileName string) *bytes.Reader {
      f := excelize.NewFile()
      f.SetCellValue("Sheet1", "B1", 100)
      err := f.SaveAs(fileName)
      if err != nil {
         fmt.Println(err)
      }
      var buffer bytes.Buffer
      _ = f.Write(&buffer)
      return bytes.NewReader(buffer.Bytes())
   }
   http.HandleFunc("/downloadExcel", func(w http.ResponseWriter, r *http.Request) {
      reader := fun("Book2.xlsx")
      // 重新设置文件名称
      w.Header().Set("Content-Disposition", "attachment; filename="+"Book2.xlsx")
      io.Copy(w, reader)
   })
   http.ListenAndServe(":8080", nil)
}