PHP 文件下载 显示进度条

前台调用：js调用：

function downloadfile(id,name,price,curcount_pricelimit){
    Date.prototype.Format = function(fmt) { //author: meizz 
        var o = {
            "M+": this.getMonth() + 1, //月份 
            "d+": this.getDate(), //日 
            "h+": this.getHours(), //小时 
            "m+": this.getMinutes(), //分 
            "s+": this.getSeconds(), //秒 
            "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
            "S": this.getMilliseconds() //毫秒 
        };
        if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
        for (var k in o)
            if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        return fmt;
    }
    var time = new Date().Format("yyyy-MM-dd-hh-mm-ss");
    var fileName = name + "_" + time + ".txt";
    //alert(fileName);
    
    window.open("downloadfile.php?fileName=" + fileName+"&id=" + id + "&name=" + name + "&price=" + price+"&curcount_pricelimit="+curcount_pricelimit); //进度条和下载文件,创建标志文件
    
    //$.ajax("download.php?id=" + id + "&name=" + name + "&price=" + price + "&fileName=" + fileName); //生成文件
    
}

 php 调用:

echo "<a style='color:blue' onclick="downloadfile(".$values['id'].",'".$values['name']."',".$values['lowest_price'].",".$values['curcount_pricelimit'].")" href='javascript:viod(0)'  target=_blank>下载</a>";

下载文件：download.php

<?php

    //下载数据
    header('Content-Type:text/html;charset=utf-8');
    //$filePath="/minbao/data/amazon/data/";
    $filePath = "d:/www/amazon/data/";//此处给出你下载的文件在服务器的什么地方
    
    $crawlId=$_GET['id'];
    $price=$_GET['price'];//最低价格
    $name=urldecode($_GET['name']);
    $name=iconv("utf-8","gb2312",$name);//解决乱码
    $time=date("Y-m-d-H-i-s");
    
    //导出sql语句：Select pid,price Into OutFile 'F:/QQPCmgr/Desktop/Data_OutFile.txt' fields terminated by ',' From `t_product`
    //导出文件命名格式Crawl_ID_txt;
    $fileName=$_GET['fileName'];
    
    //删除文件
    if(file_exists($filePath.$fileName)){
        unlink($filePath.$fileName);
    }
    
    include_once('./mysql.php');
    $conndb=new ConnDB();
    
    $str="crawl_id='".$crawlId."' and price>='".$price."' ";
       //查询配置好的关键词
    $filterSqlStr='';
    $sql="select filterword from t_crawl_configuration where id=".$crawlId;
    $request=$conndb->queryarr($sql);
    if($request){
        if(strlen($request[0][0])>0)
            $filterSqlStr=" and name NOT REGEXP '".$request[0][0]."' ";
    }else{
        echo "error";
        exit;
    }
    
    $sql="select pid,price,name Into OutFile '".$filePath.$fileName."' fields terminated by ',' lines terminated by '
' From `t_product` where ".$str.$filterSqlStr;
    //echo $sql;
    $request=$conndb->query($sql);
    if($request){
        /*echo "<script> window.location.href='download.php?id=".$crawlId."&file=".$saveFile."';</script>";*/
    }else{
        echo "<script> alert('下载失败');</script>";
        exit;
    }
    
    //删除临时文件
    $tmpFiliName=$filePath."tmp".$fileName;//临时标志文件
    echo $tmpFiliName;
    if(file_exists($tmpFiliName)){
        unlink($tmpFiliName);
    }
    
//   此处给出你下载的文件名
//    $file = fopen($filePath.$fileName, "r"); //打开文件
//    //输入文件标签
//    header("Content-type:application/octet-stream ");
//    header("Accept-Ranges:bytes ");
//    header("Accept-Length:   " . filesize($filePath.$fileName));
//    header("Content-Disposition:   attachment;   filename= ".$fileName);
//    
//    //输出文件内容
//    echo fread($file, filesize($filePath . $fileName));
//    fclose($file);
    

?>

进度条：downloadfile.php

<?php
header('Content-Type:text/html;charset=utf-8');
//$filePath="/minbao/data/amazon/data/";
$filePath="d:/www/amazon/data/";
$curcount_pricelimit = $_GET['curcount_pricelimit'];
$fileName = $_GET['fileName'];
$tmpFiliName=$filePath."tmp".$fileName;//临时标志文件

$crawlId=$_GET['id'];
$price=$_GET['price'];//最低价格
$name=urldecode($_GET['name']);

//防止执行超时
set_time_limit(0);
//清空并关闭输出缓存
ob_end_clean();
//需要循环的数据
if ($curcount_pricelimit/10000>0){
    $totalnumproduct=$curcount_pricelimit/10000;
}else{
    $totalnumproduct=10;
}
for($i = 0; $i < $totalnumproduct; $i++)
{
  $users[] = $fileName.'_' . $i;
}
//计算数据的长度

$total = count($users);
//显示的进度条长度，单位 px 
$width = 500;
//每条记录的操作所占的进度条单位长度
$pix = $width / $total;
//默认开始的进度条百分比
$progress = 0;
?>
<html>
<head>
<title>下载提示</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="./js/jquery-1.8.3.min.js"></script>
<style>
body,div input {
  font-family: Tahoma;
  font-size: 9pt
}
</style>
<script language="JavaScript">
 <!-- 
 function updateProgress(sMsg, iWidth,fsize) 
 { 
  //$("#downloaded").innerHTML=fsize+"KB";
  //alert(fsize);
  document.getElementById("downloaded").innerHTML =fsize+"KB";
  document.getElementById("status").innerHTML = sMsg; 
  document.getElementById("progress").style.width = iWidth + "px"; 
  document.getElementById("percent").innerHTML = parseInt(iWidth / <?php echo $width; ?> * 100) + "%"; 
  } 
 -->
 
 function setDownloaded(fsize) {
      fsize=fsize/1024;
      fsize=Math.round(fsize*100)/100;
      //alert(fsize);
      document.getElementById("downloaded").innerHTML =fsize+"KB";
 }
  
 
 </script>
</head>
<body>

    <table border="1" width="300">
      <tr>
        <td>已经生成</td>
        <td><div id="downloaded">0</div></td>
      </tr>
    </table>
    
  <div>
  <div style="margin:50px auto; padding: 8px; border: 1px solid gray; background: #EAEAEA;  <?php echo $width+8; ?>px">
    <div style="padding: 0; background-color: white; border: 1px solid navy;  <?php echo $width; ?>px">
      <div id="progress"
        style="padding: 0; background-color: #FFCC66; border: 0;  0px; text-align: center; height: 16px"></div>
    </div>
    <div id="status"></div>
    <div id="percent"
      style="position: relative; top: -30px; text-align: center; font-weight: bold; font-size: 8pt">0%</div>
  </div> 
<?php


echo $tmpFiliName."<br />";
if(!file_exists($tmpFiliName)){
    echo "创建文件<br />";
    file_put_contents($tmpFiliName,'tmpContent') or die("Unable to open file!");
    if(file_exists($tmpFiliName)){
        echo "创建成功<br />";
        $url="download.php?id=".$crawlId."&name=".$name."&price=".$price."&fileName=".$fileName;
        echo $url."<br />";
        echo "<script>$.ajax('".$url."');</script>";
    }
}else{
    echo "临时标志文件已经存在!";
}


flush(); //将输出发送给客户端浏览器
$filesize=0; 
foreach($users as $user)
{
      // 在此处使用空循环模拟较为耗时的操作，实际应用中需将其替换； 
      // 如果你的操作不耗时，我想你就没必要使用这个脚本了 :)
     $cnt=0; 
     if(file_exists($tmpFiliName)){
         
         if(file_exists($filePath.$fileName)){
              $file = fopen($filePath.$fileName, "rb");
              if ($file) {
                     $filesize=filesize($filePath.$fileName);
                     clearstatcache();
//                     echo $cnt++."、文件大小:".($filesize/1024)."KB<br>";
                     echo "<script>setDownloaded($filesize);</script>";//在前台显示已经下载文件大小
              }
         }
     }else{
         if(file_exists($filePath.$fileName)){
              $file = fopen($filePath.$fileName, "rb");
              if ($file) {
                     $filesize=filesize($filePath.$fileName);
                     clearstatcache();
//                     echo $cnt++."、文件大小:".($filesize/1024)."KB<br>";
                     echo "<script>setDownloaded($filesize);</script>";//在前台显示已经下载文件大小
              }
         }
         break;
     }
     //for($i=0;$i<1000000;$i++){
         
     //}
     flush();
     sleep(1);
     ?>
    <script language="JavaScript"> 
      updateProgress("正在生成数据文件 <?php echo $user; ?> ....", <?php echo min($width, intval($progress)); ?>,<?php echo $filesize/1024;?>);
    </script>
    <?php
      flush(); //将输出发送给客户端浏览器，使其可以立即执行服务器端输出的 JavaScript 程序。 
      $progress += $pix;
} //end foreach 

?> 
<script language="JavaScript">
  //最后将进度条设置成最大值 $width，同时显示操作完成 
   updateProgress("数据文件生成完成！3秒后启动下载...", <?php echo $width; ?>,<?php echo round($filesize/1024,2);?>);
</script>
    <?php 
    flush();
    sleep(3);
    ?>
<script language="JavaScript">
   window.location.href ="downloadfinish.php?filePath=<?php echo $filePath; ?>&fileName=<?php echo $fileName; ?>";
</script>
</script>
<?php
    flush();
    //删除临时文件
    if(file_exists($tmpFiliName)){
        unlink($tmpFiliName);
    }
?>
</body>
</html>

完成下载：downloadfinish.php

<?php
    $filePath=$_GET['filePath'];
    $fileName=$_GET['fileName'];
    //此处给出你下载的文件名
    $file = fopen($filePath.$fileName, "r"); //打开文件
    //输入文件标签
    header("Content-type:application/octet-stream ");
    header("Accept-Ranges:bytes ");
    header("Accept-Length:   " . filesize($filePath.$fileName));
    header("Content-Disposition:   attachment;   filename= ".$fileName);
    
    //输出文件内容
    echo fread($file, filesize($filePath . $fileName));
    fclose($file);
?>