FileDownload.class.php
- <?php
-
-
- class FileDownload{
-
- private $_speed = 512;
-
-
-
- public function download($file, $name=‘‘, $reload=false){
- if(file_exists($file)){
- if($name==‘‘){
- $name = basename($file);
- }
-
- $fp = fopen($file, ‘rb‘);
- $file_size = filesize($file);
- $ranges = $this->getRange($file_size);
-
- header(‘cache-control:public‘);
- header(‘content-type:application/octet-stream‘);
- header(‘content-disposition:attachment; filename=‘.$name);
-
- if($reload && $ranges!=null){
- header(‘HTTP/1.1 206 Partial Content‘);
- header(‘Accept-Ranges:bytes‘);
-
-
- header(sprintf(‘content-length:%u‘,$ranges[‘end‘]-$ranges[‘start‘]));
-
-
- header(sprintf(‘content-range:bytes %s-%s/%s‘, $ranges[‘start‘], $ranges[‘end‘], $file_size));
-
-
- fseek($fp, sprintf(‘%u‘, $ranges[‘start‘]));
- }else{
- header(‘HTTP/1.1 200 OK‘);
- header(‘content-length:‘.$file_size);
- }
-
- while(!feof($fp)){
- echo fread($fp, round($this->_speed*1024,0));
- ob_flush();
-
- }
-
- ($fp!=null) && fclose($fp);
-
- }else{
- return ‘‘;
- }
- }
-
-
-
- public function setSpeed($speed){
- if(is_numeric($speed) && $speed>16 && $speed<4096){
- $this->_speed = $speed;
- }
- }
-
-
-
- private function getRange($file_size){
- if(isset($_SERVER[‘HTTP_RANGE‘]) && !emptyempty($_SERVER[‘HTTP_RANGE‘])){
- $range = $_SERVER[‘HTTP_RANGE‘];
- $range = preg_replace(‘/[\s|,].*/‘, ‘‘, $range);
- $range = explode(‘-‘, substr($range, 6));
- if(count($range)<2){
- $range[1] = $file_size;
- }
- $range = array_combine(array(‘start‘,‘end‘), $range);
- if(emptyempty($range[‘start‘])){
- $range[‘start‘] = 0;
- }
- if(emptyempty($range[‘end‘])){
- $range[‘end‘] = $file_size;
- }
- return $range;
- }
- return null;
- }
-
- }
-
- ?>
-
- demo
- [codes=php]
-
- <?php
-
- require(‘FileDownload.class.php‘);
- $file = ‘book.zip‘;
- $name = time().‘.zip‘;
- $obj = new FileDownload();
- $flag = $obj->download($file, $name);
-
-
- if(!$flag){
- echo ‘file not exists‘;
- }
-
- ?>
-
- 断点续传测试方法:
- 使用linux wget命令去测试下载, wget -c -O file http:
-
- 1.先关闭断点续传
- $flag = $obj->download($file, $name);
- [plain] view plaincopy
-
- fdipzone@ubuntu:~/Downloads$ wget -O test.rar http:
- --2013-06-30 16:52:44-- http:
- 正在解析主机 demo.fdipzone.com... 127.0.0.1
- 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。
- 已发出 HTTP 请求,正在等待回应... 200 OK
- 长度: 10445120 (10.0M) [application/octet-stream]
- 正在保存至: “test.rar”
-
- 30% [============================> ] 3,146,580 513K/s 估时 14s
- ^C
- fdipzone@ubuntu:~/Downloads$ wget -c -O test.rar http:
- --2013-06-30 16:52:57-- http:
- 正在解析主机 demo.fdipzone.com... 127.0.0.1
- 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。
- 已发出 HTTP 请求,正在等待回应... 200 OK
- 长度: 10445120 (10.0M) [application/octet-stream]
- 正在保存至: “test.rar”
-
- 30% [============================> ] 3,146,580 515K/s 估时 14s
- ^C
-
- 可以看到,wget -c不能断点续传
-
-
- 2.开启断点续传
- $flag = $obj->download($file, $name, true);
- [plain] view plaincopy
-
- fdipzone@ubuntu:~/Downloads$ wget -O test.rar http:
- --2013-06-30 16:53:19-- http:
- 正在解析主机 demo.fdipzone.com... 127.0.0.1
- 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。
- 已发出 HTTP 请求,正在等待回应... 200 OK
- 长度: 10445120 (10.0M) [application/octet-stream]
- 正在保存至: “test.rar”
-
- 20% [==================> ] 2,097,720 516K/s 估时 16s
- ^C
- fdipzone@ubuntu:~/Downloads$ wget -c -O test.rar http:
- --2013-06-30 16:53:31-- http:
- 正在解析主机 demo.fdipzone.com... 127.0.0.1
- 正在连接 demo.fdipzone.com|127.0.0.1|:80... 已连接。
- 已发出 HTTP 请求,正在等待回应... 206 Partial Content
- 长度: 10445121 (10.0M),7822971 (7.5M) 字节剩余 [application/octet-stream]
- 正在保存至: “test.rar”
-
- 100%[++++++++++++++++++++++++=========================================================================>] 10,445,121 543K/s 花时 14s
-
- 2013-06-30 16:53:45 (543 KB/s) - 已保存 “test.rar” [10445121/10445121])
-
- 可以看到会从断点的位置(%20)开始下载。
-
- 源码下载地址:<a href="http://download.csdn.net/detail/fdipzone/5676439" target="_blank">点击下载 </a>
- 摘自:http:
-
-
- PHP上传实现断点续传文件的方法:
- 其实说简单点就是通过这个变量$_SERVER[‘HTTP_RANGE‘]取得用户请求的文件的range,然后程序去控制文件的输出。比如第一次请求一个文件的从0到999字节,第二次请求1000到1999字节,以此类推,每次请求1000字节的内容,然后程序通过fseek函数去取得对应的文件位置,然后输出。
- [codes=php]
- $fname = ‘./05e58c19552bb26b158f6621a6650899‘;
- $fp = fopen($fname,‘rb‘);
- $fsize = filesize($fname);
- if (isset($_SERVER[‘HTTP_RANGE‘]) && ($_SERVER[‘HTTP_RANGE‘] != "") && preg_match("/^bytes=([0-9]+)-$/i", $_SERVER[‘HTTP_RANGE‘], $match) && ($match[1] < $fsize)) {
- $start = $match[1];
- } else {
- $start = 0;
- }
- @header("Cache-control: public");
- @header("Pragma: public");
- if ($start > 0) {
- fseek($fp, $start);
- Header("HTTP/1.1 206 Partial Content");
- Header("Content-Length: " . ($fsize - $start));
- Header("Content-Ranges: bytes" . $start . "-" . ($fsize - 1) . "/" . $fsize);
- } else {
- header("Content-Length: $fsize");
- Header("Accept-Ranges: bytes");
- }
- @header("Content-Type: application/octet-stream");
- @header("Content-Disposition: attachment;filename=1.rm");
- fpassthru($fp);
php download断点
原文:http://www.cnblogs.com/gpfeisoft/p/4941054.html