PHP+Ajax异步带进度条上传文件实例

更新时间：2020-03-13 20:58:29 作者：startmvc

最近项目中要做一个带进度条的上传文件的功能,学习了Ajax,使用起来比较方便,将几个方法

最近项目中要做一个带进度条的上传文件的功能,学习了Ajax,使用起来比较方便,将几个方法实现就行。

前端引入文件


<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://malsup.github.com/jquery.form.js"></script>

Ajax进度条异步处理


<script type="text/javascript">
$(function () {
 $("#myupload").ajaxForm({
 dataType:'json',
 beforeSend:function(){ 
 $(".progress").show();
 },
 uploadProgress:function(event,position,total,percentComplete){
 var percentVal = percentComplete + '%';
 $(".progress-bar").width(percentComplete + '%');
 $(".progress-bar").html(percentVal);
 $(".sr-only").html(percentComplete + '%');
 },
 success:function(data){
 $(".progress").hide();
 
 if(data.error == "empty_name"){
 alert("文件上传非法,上传失败!");
 exit();
 };
 if(data.error == "large"){
 alert("图片上传不能大于2M,上传失败!");
 exit();
 };
 
 /*alert(data.error);*/
 if(data.error == "format"){
 alert("图片格式错误,上传失败");
 //alert(data.type);
 exit();
 };
 
 //alert("上传成功!");
 //files.html("<b>"+data.name+"("+data.size+"k)</b> <span class='delimg' rel='"+data.pic+"'>删除</span>");
 $(".files").html("文件名: "+data.name+"<span class='delimg' rel='"+data.pic+"'> del </span>大小："+data.size);
 var img = "http://www.sandleft.com/test/input/upload/files/"+data.pic;
 $(".showimg").html("<img src='"+img+"'>");
 alert("上传成功!");
 },
 error:function(){
 alert("图片上传失败");
 }
 
 });
 $(".progress").hide();
});
 
</script>

前端上传HTML


<div class="uk-container uk-container-center">
 
 <div class="pk-system-messages"></div>
 
 <h1 class="uk-h2 uk-text-center" style="margin-top:-100px;">文件上传</h1>
 <div class="pk-system-messages"></div>
 
 <div class="container-main">
 <h1>Ajax Image Uploader</h1>
 <p>A simple tutorial to explain image uploading using jquery ajax and php</p>
 
 <form id='myupload' action='new_upload.php' method='post' enctype='multipart/form-data'>
 <label for="file">Filename:</label>
 <input type="file" name="mypic" id="file"><br>
 <input type="submit" name="upload" class="btn btn-success" value="upload">
 </form>
 
 <div class="progress">
 <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 0%">
 <span class="sr-only">0% Complete</span>
 </div>
 </div>
 <div class="files"></div>
 <div class="showimg"></div>
 </div>
 
 </div>

PHP文件上传类


<?php
class upload{
 
 protected $file_path = "files"; //当前files存储文件夹
 #protected $file_size = 1024000;
 protected $file_size = 5120000; //5M 用户上传
 //检测文件是否为空
 public function check_file($get_file)
 {
 if (empty($get_file))
 {
 $type = "check_file";
 $arr = array('error'=>'empty_name','type'=>$type);
 echo json_encode($arr);
 exit();
 }
 return true;
}
 
 
 //检测文件类型
 public function check_type($get_type)
 {
 if (( $get_type == ".docx" ) || ( $get_type == ".doc" )) {
 #$types = $get_type;
 }else{
 $type = "check_type";
 $arr = array('error'=>'format','type'=>$type);
 echo json_encode($arr);
 exit(); 
 
 }
 return true;
 }
 
 //检测文件大小
 public function check_size($get_file)
 {
 if ( $get_file != "" ) {
 if ( $get_file > $this->file_size ) {
 $arr = array('error'=>'large');
 echo json_encode($arr);
 exit();
 }
 }else{
 return false;
 exit();
 }
 return true;
 }
 
//文件保存
 public function save_file($file_type,$file_tmp_name)
 {
 $rand = rand(1000, 9999);
 $pics = date("YmdHis") . $rand . $file_type;
 $path = $this->file_path."/".$pics;
 $result = move_uploaded_file($file_tmp_name, $path);
 if($result){
 return $pics;
 }else{
 return false;
 exit();
 }
 #return $pics;
 }
 
}
PHP文件上传处理
<?php
include("upload.class.php");
$up_obj = new upload();
 
$get_fileName = $_FILES['mypic']['name'];
$get_fileSize = $_FILES['mypic']['size'];
$get_TmpFiles = $_FILES['mypic']['tmp_name'];
 
$get_fileType = strstr($get_fileName, '.');
 
$check_result = $up_obj->check_file($get_fileName);
 
if($check_result){
 
 //检查文件类型
 $result_type = $up_obj->check_type($get_fileType);
 
 //检查文件大小
 if($result_type){
 
 $result_size = $up_obj->check_size($get_fileSize);
 
 if($result_size){
 //文件上传保存 
 $pics = $up_obj->save_file($get_fileType,$get_TmpFiles); 
 $size = round($get_fileSize/1024,2);
 $arr = array(
 'name' => $get_fileName,
 'pic' => $pics,
 'size'=> $size,
 'error' => 2
 );
 
 //检查文件上传状态
 if($pics){
 echo json_encode($arr);
 /*
 执行上传完成逻辑.....
 */
 } 
 }
 }
 
}

文件上传效果如图：