Introduce the principle of
Block uploaded paper is used html5in filethe object file is divided into blocks, then block uploading one, each receiving the rear end of the file upload is determined whether the block is uploaded, the file upload and delete all complete the merge block.
demo directory structure
index.php
upload.php
uplod
block
Front-end code
index.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>分片上传</title>
</head>
<body>
选择文件：
<input type="file" name="file" id="upload"> <span>等待上传...</span>
<script src="http://zui.sexy/assets/jquery.js"></script>
<script type="text/javascript">
$('#upload').on('change', function() {
// 文件对象
var file = $('#upload')[0].files[0];
// 分块的大小 默认4M
var block = 1024 * 1024 * 1;
// 文件大小
var fileSize = file.size;
// 总的分块数
var totalCount = Math.ceil(fileSize / block);
var start = 0,
end = 0;
// 原文件名
var fileName = file.name;
// 生成随机的前缀
var prfix = Math.random();
for(var num = 0; num < totalCount; num++) {
start = num * block;
end = start + block;
blockFile = file.slice(start, end);
// 组装 FormData() 对象
var formData = new FormData();
formData.append('file', blockFile);
formData.append('num', num);
formData.append('fileName', fileName);
formData.append('prfix', prfix);
formData.append('totalCount', totalCount);
$.ajax({
url: 'upload.php',
type: 'post',
data: formData,
processData:false,
contentType:false,
dataType: 'json',
successs: function(msg) {
console.log(msg);
},
error: function(err) {
console.log(err);
}
});
}
});
</script>
</body>
</html>
Back-end code
<?php
class UploadFile
{
public function upload()
{
// 接收 post 参数
$data = $_POST;
// 文件信息
$file = $_FILES;
// 分块文件上传
move_uploaded_file($file['file']['tmp_name'], 'upload/block/' . $data['prfix'] . '_' . $data['num']);
$done = 0;
// 判断文件是否上传完成
if ($data['num'] == ($data['totalCount'] - 1)) {
// 新的文件名
$ext = pathinfo($data['fileName'], PATHINFO_EXTENSION);
$newFileName = $data['prfix'] . '.' . $ext;
// 合并文件
for($i = 0; $i < $data['totalCount']; $i++) {
file_put_contents('upload/' . $newFileName, file_get_contents('upload/block/' . $data['prfix'] . '_' . $i));
}
// 合并完成后删除分块文件
for($i = 0; $i < $data['totalCount']; $i++) {
unlink('upload/block/' . $data['prfix'] . '_' . $i);
}
$done = 1;
}
echo json_encode([
'code' => 0,
'msg' => '文件上传',
'data' => [
'donw' => $done,
]
]);
}
public function fileExists($fileName)
{
if (file_exists('upload/' . $fileName)) {
return true;
}
return false;
}
public function dirExists($dir)
{
if (!is_dir($dir)) {
mkdir('upload/' . $dir);
}
return true;
}
}
$upload = new UploadFile();
$upload->upload();
