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vue实现切片上传

2026-01-18 12:54:00VUE

切片上传的实现原理

切片上传是将大文件分割成多个小块（切片）分别上传，最后在服务端合并。这种方式能提高上传效率、支持断点续传和并发上传。

前端实现步骤

使用Vue实现切片上传需要借助File对象的slice方法分割文件，配合axios或fetch发送请求。

<template>
  <input type="file" @change="handleFileChange" />
  <button @click="uploadFile">上传</button>
</template>

<script>
export default {
  data() {
    return {
      file: null,
      chunkSize: 2 * 1024 * 1024, // 2MB每片
    };
  },
  methods: {
    handleFileChange(e) {
      this.file = e.target.files[0];
    },
    async uploadFile() {
      if (!this.file) return;

      const chunks = this.createChunks(this.file);
      await this.uploadChunks(chunks);
    },
    createChunks(file) {
      const chunks = [];
      let start = 0;
      while (start < file.size) {
        const end = Math.min(start + this.chunkSize, file.size);
        chunks.push({
          chunk: file.slice(start, end),
          index: chunks.length,
          total: Math.ceil(file.size / this.chunkSize),
          filename: file.name,
        });
        start = end;
      }
      return chunks;
    },
    async uploadChunks(chunks) {
      const requests = chunks.map((item) => {
        const formData = new FormData();
        formData.append('chunk', item.chunk);
        formData.append('index', item.index);
        formData.append('total', item.total);
        formData.append('filename', item.filename);

        return axios.post('/upload', formData, {
          headers: { 'Content-Type': 'multipart/form-data' },
        });
      });

      await Promise.all(requests);
      this.mergeChunks();
    },
    async mergeChunks() {
      await axios.post('/merge', {
        filename: this.file.name,
        total: Math.ceil(this.file.size / this.chunkSize),
      });
    },
  },
};
</script>

关键点说明

文件分割：通过File.prototype.slice方法将文件切割成指定大小的块。
并发上传：使用Promise.all并发上传所有切片。
合并请求：所有切片上传完成后，发送合并请求通知服务端。

服务端处理逻辑

服务端需要实现两个接口：

vue实现切片上传

接收切片并临时存储
合并所有切片为完整文件

// Node.js示例（Express框架）
const express = require('express');
const fs = require('fs');
const multer = require('multer');
const path = require('path');

const app = express();
const upload = multer({ dest: 'temp/' });

app.post('/upload', upload.single('chunk'), (req, res) => {
  const { index, filename } = req.body;
  const chunkPath = path.join('temp', `${filename}-${index}`);
  fs.renameSync(req.file.path, chunkPath);
  res.send({ success: true });
});

app.post('/merge', async (req, res) => {
  const { filename, total } = req.body;
  const filePath = path.join('uploads', filename);
  const writeStream = fs.createWriteStream(filePath);

  for (let i = 0; i < total; i++) {
    const chunkPath = path.join('temp', `${filename}-${i}`);
    const chunk = fs.readFileSync(chunkPath);
    writeStream.write(chunk);
    fs.unlinkSync(chunkPath);
  }

  writeStream.end();
  res.send({ success: true });
});