1.导入功能基本实现

1.1下载excel依赖包

npm install xlsx -S

1.2 封装组件?

?在src/components下面新建UploadExcel/index.vue组件?

<template>
  <div>
    <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
    <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
      Drop excel file here or
      <el-button :loading="loading" style="margin-left:16px;" size="mini" type="primary" @click="handleUpload">
        Browse
      </el-button>
    </div>
  </div>
</template>

<script>
import XLSX from 'xlsx'

export default {
  name: 'UploadExcel',
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function// eslint-disable-line
  },
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    generateData({ header, results }) {
      this.excelData.header = header
      this.excelData.results = results
      this.onSuccess && this.onSuccess(this.excelData)
    },
    handleDrop(e) {
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('Only support uploading one file!')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error('Only supports upload .xlsx, .xls, .csv suffix files')
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    handleDragover(e) {
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    },
    handleUpload() {
      this.$refs['excel-upload-input'].click()
    },
    handleClick(e) {
      const files = e.target.files
      const rawFile = files[0] // only use files[0]
      if (!rawFile) return
      this.upload(rawFile)
    },
    upload(rawFile) {
      this.$refs['excel-upload-input'].value = null // fix can't select the same excel

      if (!this.beforeUpload) {
        this.readerData(rawFile)
        return
      }
      const before = this.beforeUpload(rawFile)
      if (before) {
        this.readerData(rawFile)
      }
    },
    readerData(rawFile) {
      this.loading = true
      return new Promise((resolve, reject) => {
        const reader = new FileReader()
        reader.onload = e => {
          const data = e.target.result
          const workbook = XLSX.read(data, { type: 'array' })
          const firstSheetName = workbook.SheetNames[0]
          const worksheet = workbook.Sheets[firstSheetName]
          const header = this.getHeaderRow(worksheet)
          const results = XLSX.utils.sheet_to_json(worksheet)
          this.generateData({ header, results })
          this.loading = false
          resolve()
        }
        reader.readAsArrayBuffer(rawFile)
      })
    },
    getHeaderRow(sheet) {
      const headers = []
      const range = XLSX.utils.decode_range(sheet['!ref'])
      let C
      const R = range.s.r
      /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) { /* walk every column in the range */
        const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]
        /* find the cell in the first row */
        let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
      }
      return headers
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name)
    }
  }
}
</script>

<style scoped>
.excel-upload-input{
  display: none;
  z-index: -9999;
}
.drop{
  border: 2px dashed #bbb;
  width: 600px;
  height: 160px;
  line-height: 160px;
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>

1.3全局注册组件

import UploadExcel from './UploadExcel'
export default {
  install(p) {
    p.component(UploadExcel.name, UploadExcel)
  }
}

?1.4 使用组件

使用后我们就会拿到一个基本的上传excel的基本结构? 如图??

?1.5 导入功能基本实现代码

<template>
  <div>
    <UploadExcel :on-success="handleSuccess" :before-upload="beforeUpload" />
  </div>
</template>

<script>
import { formatExcelDate } from '@/utils/index'
import { importEmployee } from '@/api/employees'
export default {
  methods: {

    beforeUpload(file) {
      const isLt1M = file.size / 1024 / 1024 < 1

      if (isLt1M) {
        return true
      }

      this.$message({
        message: 'Please do not upload files larger than 1m in size.',
        type: 'warning'
      })
      return false
    },
    handleSuccess({ results, header }) {
      /**
     * results excel表格的内容
      // [
          {'姓名'：'小张'， '手机号': '13712345678'}
        , {.....}
        ]

      // 目标
      // [ {'username'：'小张'，'mobile': '13712345678'}, {.....} ]
     */
      // 把一个对象数组中的每个对象的属性名，从中文改成英文
      // 思路：对于原数组每个对象来说
      //    （1） 找出所有的中文key
      //     (2)  得到对应的英文key
      //     (3)  拼接一个新对象： 英文key:值
      console.log(results, header)
      const newArr = this.format(results, header)
      // console.log(newArr)
      this.doImport(newArr)
    },
    // 导入excel
    format(result, header) {
      const mapInfo = {
        '入职日期': 'timeOfEntry',
        '手机号': 'mobile',
        '姓名': 'username',
        '转正日期': 'correctionTime',
        '工号': 'workNumber',
        '部门': 'departmentName',
        '聘用形式': 'formOfEmployment'
      }
      const arr = []
      result.map(it => {
        const enobj = {}
        header.forEach(zhkey => {
          const enkey = mapInfo[zhkey]
          if (enkey === 'timeOfEntry' || enkey === 'correctionTime') {
            enobj[enkey] = new Date(formatExcelDate(it[zhkey]))
          } else {
            enobj[enkey] = it[zhkey]
          }
        })
        arr.push(enobj)
      })
      return arr
    },
    async doImport(newArr) {
      try {
        const res = await importEmployee(newArr)
        console.log(res)
        this.$message.success('批量导入成功')
        this.$router.back()
      } catch (error) {
        console.log(error)
      }
    }
  }
}
</script>

<style>

</style>

format函数的原理解析请移步到另一篇博客??干货大全_m0_52765288的博客-CSDN博客

1.6 formatExcel格式化excel的时间?


// 把excel文件中的日期格式的内容转回成标准时间
export function formatExcelDate(numb, format = '/') {
  const time = new Date((numb - 25567) * 24 * 3600000 - 5 * 60 * 1000 - 43 * 1000 - 24 * 3600000 - 8 * 3600000)
  time.setYear(time.getFullYear())
  const year = time.getFullYear() + ''
  const month = time.getMonth() + 1 + ''
  const date = time.getDate() + ''
  if (format && format.length === 1) {
    return year + format + month + format + date
  }
  return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date)
}

1.7封装接口

/**
 * @description: 导入excel
 * @param {*} data
 * @return {*}
 */
export function importEmployee(data) {
  return request({
    url: '/sys/user/batch',
    method: 'post',
    data
  })
}

2.导出功能

2.1定义导出excel的方法

hExport() {
      import('@/vendor/Export2Excel').then(async excel => {
        // 发ajax请求，获取数据
        const res = await getEmployeeList(this.paramsPage)
        const list = res.data.rows
        console.log('从后端获取的数据', list)

        const { header, data } = this.formatData(list)
        // excel表示导入的模块对象
        console.log(header, data)
        excel.export_json_to_excel({
          // header: ['姓名', '工资'], // 表头 必填
          header: header, // 表头 必填
          data: data,
          // data: [
          //   ['刘备11111111111111', 100],
          //   ['关羽', 500]
          // ], // 具体数据 必填
          filename: 'excel-list', // 文件名称
          autoWidth: true, // 宽度是否自适应
          bookType: 'xlsx' // 生成的文件类型
        })
      })
    }

2.2 自定义导出格式

  formatData(list) {
      const map = {
        'id': '编号',
        'password': '密码',
        'mobile': '手机号',
        'username': '姓名',
        'timeOfEntry': '入职日期',
        'formOfEmployment': '聘用形式',
        'correctionTime': '转正日期',
        'workNumber': '工号',
        'departmentName': '部门',
        'staffPhoto': '头像地址'
      }
      console.log(list)
      let header = []
      // header = ['id', 'mobile', 'username', .....]
      // data = [
      //     ['65c2', '1380000002', '管理员', ....],
      //     ['65c3', '1380000003', '孙财', ....],
      // ]
      let data = []
      // 开始代码
      // 找到一个元素
      const one = list[0]
      if (!one) {
        return { header, data }
      }
      header = Object.keys(one).map(key => {
        return map[key]
      })

      // data把list中每一个对象转成 对应的value数组
      data = list.map(obj1 => {
        // 把  Obj['formOfEmployment']: 1 , 2   ---> '正式'， '非正式'
        const key = obj1['formOfEmployment'] // 1, 2
        obj1['formOfEmployment'] = obj[key] // hireTypEnmu:{1:'正式', '2':'非正式' }

        return Object.values(obj1)
      })

      return { header, data }
    },