JS分片上传
//分片上传
function ScarecrowPatchUpload (uploadPath, isPatch,onePackSize=1024*1024) {
//是否分片上传
isPatch = isPatch == undefined ? false : Boolean(isPatch);
if (uploadPath == undefined) {
throw new Error("ScarecrowPatchUpload obj must parameter 1:uploadPath");
}
this.__init__(uploadPath, isPatch, onePackSize);
}
ScarecrowPatchUpload.prototype={
constructor: ScarecrowPatchUpload,
fileObj:null,
fileName:"",
fileSize:0,
uploadPath:"./",
onePackSize:1024*1024*8,
blockData:null,
blockNum:0,
blockNumSum:0,
isPatch:false,
startIndex:0,
endIndex:0,
formData:null,
ajaxObj:null,
isSend:false,
isSendTemp:true,
__iCnt:0,
//上传完成回调函数
funcUploadSuccess:function () {},
//每个分片上传成功回调函数
funcUploadStateChange:function () {},
__init__:function (uploadPath, isPatch, onePackSize) {
this.isPatch = isPatch;
this.formData = new FormData();
this.ajaxObj = new XMLHttpRequest();
this.uploadPath = uploadPath;
if (this.isPatch) {
this.onePackSize = onePackSize;
}
},
addFile:function (fileInfo) {
if (fileInfo.files.length < 1) {
console.error("没有找到对应的文件");
return false;
}
console.log(fileInfo.files);
this.fileObj = fileInfo.files[0];
this.fileName = this.fileObj.name;
this.fileSize = this.fileObj.size;
if (this.isPatch) {
this.blockNumSum = Math.ceil(this.fileSize / this.onePackSize)
}
this.isSend = true;
this.isSendTemp = false;
if (this.isPatch) {
this.__iCnt = setInterval(()=>{
console.log(this.blockNum);
if (this.blockNum >= this.blockNumSum) {
clearInterval(this.__iCnt);
return ;
}
if (this.isSendTemp) {
this.sendFile();
}
}, 500);
}
},
//发送文件
sendFile:function () {
this.isSendTemp = false;
if (!this.isSend) {
console.error("请先使用addFile添加文件对象");
return false;
}
if (this.isPatch) {
if(!this.cutFile()){
return ;
}
} else {
this.blockNum = 1;
this.blockNumSum = 1;
this.blockData = this.fileObj;
}
this.clearFormData();
this.formData.append('file', this.blockData);
this.formData.append('blockNum', this.blockNum);
this.formData.append('blockNumSum', this.blockNumSum);
this.formData.append('fileName', this.fileName);
this.formData.append('isPatch', this.isPatch);
this.ajaxObj.open('POST',this.uploadPath,false);
this.ajaxObj.onreadystatechange = () => {
if (this.ajaxObj.status == 500 && this.isPatch) {
clearInterval(this.__iCnt);
}
if (this.ajaxObj.readyState == 4 && this.ajaxObj.status == 200) {
this.funcUploadStateChange.call(this);
if (this.blockNum >= this.blockNumSum) {
this.funcUploadSuccess.call(this);
this.__resetObj();
}
this.ajaxObj.readyState = 1;
this.isSendTemp = true;
}
}
this.ajaxObj.send(this.formData);
},
//分割文件
cutFile:function () {
this.endIndex = this.startIndex + this.onePackSize;
if (this.startIndex > this.fileSize) {
this.startIndex = 0;
return false;
}
this.blockNum += 1;
this.blockData = this.fileObj.slice(this.startIndex, this.endIndex);
this.startIndex = this.endIndex;
return true;
},
clearFormData:function () {
this.formData.has('file') ? this.formData.delete("file"): null;
this.formData.has('blockNum') ? this.formData.delete("blockNum"): null;
this.formData.has('blockNumSum') ? this.formData.delete("blockNumSum"): null;
this.formData.has('fileName') ? this.formData.delete("fileName"): null;
this.formData.has('isPatch') ? this.formData.delete("isPatch"): null;
},
setFuncUploadSuccess:function (func) {
if (typeof func == "function") {
this.funcUploadSuccess = func;
} else {
throw new Error("setFuncUploadSuccess parameter 1 must is function");
}
},
//设置上传状态改变函数
setFuncUploadStateChange:function (func) {
if (typeof func == "function") {
this.funcUploadStateChange = func;
} else {
throw new Error("setFuncUploadStateChange parameter 1 must is function");
}
},
//重置参数
__resetObj:function () {
this.fileObj = null;
this.blockNumSum = 0;
this.blockNum = 0;
this.endIndex = 0;
this.formData = new FormData();
}
}
文档：
## 分页上传JS说明文档
## 方法：
### addFile(fileInfo):void
添加一个文件对象
fileInfo为input 中的file具体对象
### sendFile():void
上传文件
### setFuncUploadSuccess(func):void
设置上传成功后的回调函数
func：callback 回调函数
### setFuncUploadStateChange(func):void
设置分片上传每个分片上传成功时的回调函数
func:callback 回调函数
示例：
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#progress{
width: 300px;
height: 20px;
background-color:#f7f7f7;
box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);
border-radius:4px;
background-image:linear-gradient(to bottom,#f5f5f5,#f9f9f9);
}
#finish{
background-color: #149bdf;
background-image:linear-gradient(45deg,rgba(255,255,255,0.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,0.15) 50%,rgba(255,255,255,0.15) 75%,transparent 75%,transparent);
background-size:40px 40px;
height: 100%;
}
form{
margin-top: 50px;
}
</style>
</head>
<body>
<div id="progress">
<div id="finish" style="width: 0%;" progress="0"></div>
<br>
<span id="showjindu"></span>
</div>
<form>
<input type="file" name="file" id="file">
<input type="button" value="上传" id="sc">
</form>
<script src="ScarecrowPatchUpload.js"></script>
<script>
var fileForm = document.getElementById("file");
upload = new ScarecrowPatchUpload("./index.php", true);
upload.setFuncUploadSuccess(function () {
console.log(this.fileName+"上传成功");
alert(this.fileName+"上传成功");
});
upload.setFuncUploadStateChange(function () {
var progress;
var progressObj = document.getElementById('finish');
var showjindu = document.getElementById("showjindu");
if(this.blockNumSum == 1){
progress = '100%';
}else{
progress = Math.min(100,(this.blockNum/this.blockNumSum)* 100 ) +'%';
}
progressObj.style.width = progress;
showjindu.innerHTML= progress;
});
fileForm.onchange = function(){
upload.addFile(this);
upload.sendFile();
}
</script>
</body>
</html>
upload.php
<?php
class Upload{
private $filepath = './upload'; //上传目录
private $tmpPath; //PHP文件临时目录
private $blobNum; //第几个文件块
private $totalBlobNum; //文件块总数
private $fileName; //文件名
public function __construct($tmpPath,$blobNum,$totalBlobNum,$fileName){
$this->tmpPath = $tmpPath;
$this->blobNum = $blobNum;
$this->totalBlobNum = $totalBlobNum;
$this->fileName = $fileName;
}
//判断是否是最后一块，如果是则进行文件合成并且删除文件块
private function fileMerge(){
if($this->blobNum == $this->totalBlobNum){
$file = fopen($this->filepath.'/'. $this->fileName, "a+");
$blob = '';
for($i=1; $i<= $this->totalBlobNum; $i++){
$blob = file_get_contents($this->filepath.'/'. $this->fileName.'__'.$i);
fwrite($file, $blob);
}
fclose($file);
$this->deleteFileBlob();
}
}
//删除文件块
private function deleteFileBlob(){
for($i=1; $i<= $this->totalBlobNum; $i++){
@unlink($this->filepath.'/'. $this->fileName.'__'.$i);
}
}
//移动文件
private function moveFile(){
$this->touchDir();
$filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum;
if (is_uploaded_file($this->tmpPath)){
move_uploaded_file($this->tmpPath,$filename);
}
}
//建立上传文件夹
private function touchDir(){
if(!file_exists($this->filepath)){
return mkdir($this->filepath);
}
}
//开始接受上传
public function start()
{
$this->moveFile();
$this->fileMerge();
}
}
//实例化并获取系统变量传参
$upload = new Upload($_FILES['file']['tmp_name'],$_POST['blockNum'],$_POST['blockNumSum'],$_POST['fileName']);
$upload->start();
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