前端环境准备及目录结构：

 npm create vue 并取名为big-file-upload-fontend
通过 npm i  安装以下内容"dependencies": {"axios": "^1.7.9","element-plus": "^2.9.1","js-sha256": "^0.11.0","vue": "^3.5.13"},

main.js中的内容

import { createApp } from 'vue'
import App from './App.vue'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
// app.use(ElementPlus)
const app = createApp(App)
app.use(ElementPlus)
app.mount('#app')

App.vue 中的内容：

<template><div class="button"><el-uploadref="uploadRef"class="upload-demo":http-request="uploadFile":show-file-list="false"><el-button type="primary">点击上传文件</el-button></el-upload></div>
</template>
<script setup>
import axios from 'axios'
import {sha256} from 'js-sha256'const uploadFile = ({file}) => {// 每4MB为一个小文件const chunkSize = 4 * 1024 * 1024; // 4MB// 文件总大小const fileSize = file.size;// 分成了多少个片段const chunks = Math.ceil(fileSize / chunkSize);// 保证文件唯一const sha256Promise = sha256(file.name); // sha256的参数只接收字符串// 询问已经上传了几个片段const checkUploadedChunks = () => {return axios.post('http://127.0.0.1:8000/api/check', {sha256Promise: sha256Promise}).then(response => {return response.data; // response.data 就是下边的 uploadedChunks});};return checkUploadedChunks().then(async uploadedChunks => {if (uploadedChunks.length === chunks) {console.log("已经上传完成就不需要再重复上传")return Promise.resolve();}for (let i = 0; i < chunks; i++) {const formData = new FormData();// 将之前上传过的片段过滤掉，即不上传之前上传过的内容if (uploadedChunks.includes(i + 1)) {continue;}const start = i * chunkSize;// 将文件分片const chunk = file.slice(start, start + chunkSize);// 使用FormData形式上传文件formData.append('chunk', chunk);formData.append('chunkNumber', i + 1);formData.append('chunksTotal', chunks);formData.append('sha256Promise', sha256Promise);formData.append('filename', file.name);// 一次只上传一个片段，本次上传完成后才上传下一个const res = await axios.post('http://127.0.0.1:8000/api/upload', formData)}});
};
</script><style >
html, body{height: 100%;width: 100%;background-color: pink;
}
</style>

django后端环境及目录：

django-admin startproject big_file_upload_backend # 创建一个big_file_upload_backend项目
python版本：
Python 3.11.11
pip 需要安装：
Django                        5.0.6 
django-cors-headers           4.6.0  # 用于解决跨域 

big_file_upload_backend/settings.py 中的配置如下：

MIDDLEWARE = [......'django.contrib.sessions.middleware.SessionMiddleware',"corsheaders.middleware.CorsMiddleware",  # CorsMiddleware一定要在CommonMiddleware之前'django.middleware.common.CommonMiddleware',# 'django.middleware.csrf.CsrfViewMiddleware', #  注释掉这个'django.contrib.auth.middleware.AuthenticationMiddleware',......
]
# 并在文件最后添加上允许所有跨域
CORS_ALLOW_CREDENTIALS = True
CORS_ALLOW_ALL_ORIGINS = True
CORS_ALLOW_HEADERS = ('*')
# 将STATIC_URL = 'statics/' 替换为下边这三行
STATIC_URL = 'statics/'
STATICFILES_DIRS = [os.path.join(BASE_DIR, "../statics"),
]# 完整的setting设置如下：
"""
Django settings for big_file_upload_backend project.Generated by 'django-admin startproject' using Django 4.2.For more information on this file, see
https://docs.djangoproject.com/en/4.2/topics/settings/For the full list of settings and their values, see
https://docs.djangoproject.com/en/4.2/ref/settings/
"""
import os
from pathlib import Path# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/4.2/howto/deployment/checklist/# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-%sa^&p^%m3+m0ex%@y%la0(zzt4y4k3l%0=p#tipx-kz6w*#=d'# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = TrueALLOWED_HOSTS = []# Application definitionINSTALLED_APPS = ['django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles',
]MIDDLEWARE = ['django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware',"corsheaders.middleware.CorsMiddleware",'django.middleware.common.CommonMiddleware',# 'django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',
]ROOT_URLCONF = 'big_file_upload_backend.urls'TEMPLATES = [{'BACKEND': 'django.template.backends.django.DjangoTemplates','DIRS': [],'APP_DIRS': True,'OPTIONS': {'context_processors': ['django.template.context_processors.debug','django.template.context_processors.request','django.contrib.auth.context_processors.auth','django.contrib.messages.context_processors.messages',],},},
]WSGI_APPLICATION = 'big_file_upload_backend.wsgi.application'# Database
# https://docs.djangoproject.com/en/4.2/ref/settings/#databasesDATABASES = {'default': {'ENGINE': 'django.db.backends.sqlite3','NAME': BASE_DIR / 'db.sqlite3',}
}# Password validation
# https://docs.djangoproject.com/en/4.2/ref/settings/#auth-password-validatorsAUTH_PASSWORD_VALIDATORS = [{'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',},{'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',},{'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',},{'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',},
]# Internationalization
# https://docs.djangoproject.com/en/4.2/topics/i18n/LANGUAGE_CODE = 'en-us'TIME_ZONE = 'UTC'USE_I18N = TrueUSE_TZ = True# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/4.2/howto/static-files/STATIC_URL = 'statics/'
STATICFILES_DIRS = [os.path.join(BASE_DIR, "../statics"),
]# Default primary key field type
# https://docs.djangoproject.com/en/4.2/ref/settings/#default-auto-fieldDEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
CORS_ALLOW_CREDENTIALS = True
CORS_ALLOW_ALL_ORIGINS = True
CORS_ALLOW_HEADERS = ('*')

big_file_upload_backend/urls.py中的配置如下：

from django.contrib import admin
from django.urls import path
from big_file_upload_backend.views import checks, uploadurlpatterns = [path('admin/', admin.site.urls),path('api/check', checks),path('api/upload', upload),
]

big_file_upload_backend/views.py中的配置如下：

import json
import os
from django.http import JsonResponse
from big_file_upload_backend import settingsdef checks(request):if request.method == "POST":body = json.loads(request.body.decode("utf-8"))filename = body.get("sha256Promise", None)base_path = settings.STATIC_URL+'record_files/'+filename+'.txt'# base_path = '../statics/record_files/'+filename+'.txt'file_is_exits = os.path.exists(base_path)# 判断文件是否存在，存在则说明之前至少上传过一次if file_is_exits:with open(base_path, 'r') as f:check_list = json.loads(f.readline())else:# 不存在就返回空check_list = []return JsonResponse(check_list, safe=False)def upload(request):if request.method == "POST":# 注意这里用的是request.FILES 因为chunk为文件流形式chunk = request.FILES.get("chunk")# 当前的切片编号chunk_number = request.POST.get("chunkNumber")# 总切片数量chunks_total = int(request.POST.get("chunksTotal"))# 文件名唯一标识sha256_promise = request.POST.get("sha256Promise")# 文件名称filename = request.POST.get("filename")# base_path = '../statics/upload_files/'+sha256_promise # 这样写无效base_path = settings.STATIC_URL + "upload_files/" + sha256_promise  # 必须这样写# record_path中的txt文件用于记录已经上传过的切片record_path = settings.STATIC_URL + "record_files/" + sha256_promise+'.txt'  # 必须这样写os.makedirs(base_path, exist_ok=True)# 后缀名ext = filename.split(".")[-1]# 小切片的文件名称order_file = chunk_number+'.'+extfname = base_path+"/" + order_filewith open(fname, 'wb') as f:for line in chunk:# 将上传的文件写入小切片中，等上传完成后进行合并f.write(line)# 等写完了才做判断chunk_number_int = int(chunk_number)  # 将字符串转成intline_list = [int(chunk_number)]  # 默认先添加一个切片片段if os.path.exists(record_path):with open(record_path, 'r') as f:line_data = f.readline()  # 读取已经上传的小切片if line_data == '':passelse:line_list = json.loads(line_data)  # 将字符串形式的数组转为python数组if chunk_number_int not in line_list:line_list.append(chunk_number_int)  # 如果当前切片号不在已上传的数组中则添加with open(record_path, 'w') as f:f.write(json.dumps(line_list))  # 将已上传的片段列表重新写回记录文件中#  合并小切片片段段if len(line_list) == chunks_total:with open(base_path+"/"+filename, "wb") as f:# 按照升序一个一个合并for num in sorted(line_list):with open(base_path+"/"+str(num)+"."+ext, 'rb') as r:f.write(r.read())# 读取完毕将片段删除，只保留合并后的文件os.remove(base_path+"/"+str(num)+"."+ext)# 返回没啥用check_list = {"chunk_number": chunk_number, "code": 200}return JsonResponse(check_list)

在项目根目录下要新建一个statics目录，且其下边要有两个目录：

record_files
upload_files

最后分别运行前后端项目

前端：npm run dev
后端： python manage.py runserver

点击上传文件，选择一个较大的文件进行上传，可以看到右侧一直再分片上传，上传完成后会在上述两个文件中分别多出两个文件

如果是上传过程中还可以看到upload_files文件下的小分片中的片段产生和合并过程，也可以在上传到一半时随机关闭浏览器，下次打开重新上传，则会跳过之前上传的继续进行上传。上传完成后的效果：