Java如何实现文件分片上传的？
摘要：文件分片上传 核心思想：前端分片上传，后端合并文件 测试页面 <!doctype html> <html lang="en&quot
文件分片上传
核心思想：前端分片上传，后端合并文件
测试页面
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>文件分片上传</title>
</head>
<body>
<input type="file" id="fileInput" />
<button onclick="uploadFile()">上传</button>
<script>
function uploadFile() {
const fileInput = document.getElementById('fileInput')
const file = fileInput.files[0]
if (!file) {
alert('请选择文件')
return
}
const chunkSize = 1024 * 1024 // 每个分片 1MB
const totalChunks = Math.ceil(file.size / chunkSize)
const identifier = file.name + '_' + file.size
let currentChunk = 0
function uploadChunk() {
const start = currentChunk * chunkSize
const end = Math.min(start + chunkSize, file.size)
const chunk = file.slice(start, end)
const formData = new FormData()
formData.append('file', chunk)
formData.append('chunkNumber', currentChunk)
formData.append('totalChunks', totalChunks)
formData.append('identifier', identifier)
const xhr = new XMLHttpRequest()
xhr.open('POST', 'http://localhost:8080/file/uploadChunk', true)
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
const response = JSON.parse(xhr.responseText)
if (response.success) {
currentChunk++
if (currentChunk < totalChunks) {
uploadChunk()
} else {
mergeChunks()
}
} else {
alert('分片上传失败: ' + response.message)
}
} else {
alert('请求出错: ' + xhr.status)
}
}
}
xhr.send(formData)
}
function mergeChunks() {