PHP+Ajax异步带进度条上传文件实例

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：

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