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程序中怎样用最简单方法实现写excel文档

惠特曼 2024-11-06 阅读 6
  1. 安装必要的库
    npm install xlsx
  2. 创建一个组件来处理文件上传和解析
    src/components 目录下创建一个名为 ExcelPreview.vue 的文件
    <template>
    <div>
    <input type="file" @change="handleFileUpload" />
    <table v-if="sheetData.length">
    <thead><tr><th v-for="(header, index) in sheetData[0]" :key="index">{{ header }}</th></tr></thead>
    <tbody><tr v-for="(row, rowIndex) in sheetData.slice(1)" :key="rowIndex"><td v-for="(cell, cellIndex) in row" :key="cellIndex">{{ cell }}</td></tr></tbody>
    </table>
    </div>
    </template>
    
    <script setup lang="ts">
    import { ref } from 'vue';
    import * as XLSX from 'xlsx';
    
    const sheetData = ref([]);
    
    const handleFileUpload = (event: Event) => {
      const file = (event.target as HTMLInputElement).files?.[0];
      if (file) {
        const reader = new FileReader();
        reader.onload = (e) => {
          const data = new Uint8Array(e.target?.result as ArrayBuffer);
          const workbook = XLSX.read(data, { type: 'array' });
          const firstSheetName = workbook.SheetNames[0];
          const worksheet = workbook.Sheets[firstSheetName];
          sheetData.value = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
        };
        reader.readAsArrayBuffer(file);
      }
    };
    </script>

    如果excel文件是后台返回的一个链接,需要重新请求解析成ArrayBuffer,
    以下是nuxt3 示例:


    // 为了解决跨域问题,在server/api 下 创建一个请求api, downloadFileByProxy.ts
    import { defineEventHandler } from 'h3';

    export default defineEventHandler(async event => {
    const { filePath } = getQuery(event)
    ;
    let matches = filePath?.match(/^https?\:\/\/([^\/?#]+)(?:[\/?#]|$)/i);
    let domain = matches && matches[1];
    return proxyRequest(event,`https://${domain}/`, {
    fetch: ()=>fetch(filePath),
    })
    })

    ExcelPreview.vue 文件中:

      async function getFile(path: string) {
    // download pdf from api to prevent CORS
    const { _data } = await $fetch.raw(`/api/downloadFileByProxy`, {
    method: 'get',
    params: {
    filePath: path,
    },
    });
    let blob = _data;
    let buffer = await blob?.arrayBuffer();
    return buffer;
    }

    const debounceRenderHandle = debounce(async () => {
    bufferCache.value = bufferCache.value || (await getFile(props.path)); // bufferCache这里是用来处理缓存,可以视具体情况加这个变量与否
    const data = new Uint8Array(bufferCache.value as ArrayBuffer);
    const workbook = XLSX.read(data, { type: 'array' });
    const firstSheetName = workbook.SheetNames[0];
    const worksheet = workbook.Sheets[firstSheetName];
    sheetData.value = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
    }, 500);

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