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PHP 下载远程文件类(支持断点续传)

作者:不详 来源:网络 发布时间: 2014-08-20 22:06 点击:
PHP 下载远程文件类,支持断点续传下载,代码内含有具体的调用说明。程序主要是使用 HTTP 协议下载文件,HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束,可以有两种使用方法,具体请下载查看源码。 ?php /** * 下载远程文件类支持断点续传

PHP 下载远程文件类(支持断点续传)

  PHP 下载远程文件类,支持断点续传下载,代码内含有具体的调用说明。程序主要是使用 HTTP 协议下载文件,HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束,可以有两种使用方法,具体请下载查看源码。

  <?php

  /**

  * 下载远程文件类支持断点续传

  */

  class HttpDownload {

  private $m_url = "";

  private $m_urlpath = "";

  private $m_scheme = "http";

  private $m_host = "";

  private $m_port = "80";

  private $m_user = "";

  private $m_pass = "";

  private $m_path = "/";

  private $m_query = "";

  private $m_fp = "";

  private $m_error = "";

  private $m_httphead = "" ;

  private $m_html = "";

  /**

  * 初始化

  */

  public function PrivateInit($url){

  $urls = "";

  $urls = @parse_url($url);

  $this->m_url = $url;

  if(is_array($urls)) {

  $this->m_host = $urls["host"];

  if(!empty($urls["scheme"])) $this->m_scheme = $urls["scheme"];

  if(!empty($urls["user"])) $this->m_user = $urls["user"];

  if(!empty($urls["pass"])) $this->m_pass = $urls["pass"];

  if(!empty($urls["port"])) $this->m_port = $urls["port"];

  if(!empty($urls["path"])) $this->m_path = $urls["path"];

  $this->m_urlpath = $this->m_path;

  if(!empty($urls["query"])) {

  $this->m_query = $urls["query"];

  $this->m_urlpath .= "?".$this->m_query;

  }

  }

  }

  /**

  * 打开指定网址

  */

  function OpenUrl($url) {

  #重设各参数

  $this->m_url = "";

  $this->m_urlpath = "";

  $this->m_scheme = "http";

  $this->m_host = "";

  $this->m_port = "80";

  $this->m_user = "";

  $this->m_pass = "";

  $this->m_path = "/";

  $this->m_query = "";

  $this->m_error = "";

  $this->m_httphead = "" ;

  $this->m_html = "";

  $this->Close();

  #初始化系统

  $this->PrivateInit($url);

  $this->PrivateStartSession();

  }

  /**

  * 获得某操作错误的原因

  */

  public function printError() {

  echo "错误信息:".$this->m_error;

  echo "具体返回头:<br>";

  foreach($this->m_httphead as $k=>$v) {

  echo "$k => $v <br>rn";

  }

  }

  /**

  * 判别用Get方法发送的头的应答结果是否正确

  */

  public function IsGetOK() {

  if( ereg("^2",$this->GetHead("http-state")) ) {

  return true;

  } else {

  $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br>";

  return false;

  }

  }

  /**

  * 看看返回的网页是否是text类型

  */

  public function IsText() {

  if (ereg("^2",$this->GetHead("http-state")) && eregi("^text",$this->GetHead("content-type"))) {

  return true;

  } else {

  $this->m_error .= "内容为非文本类型<br>";

  return false;

  }

  }

  /**

  * 判断返回的网页是否是特定的类型

  */

  public function IsContentType($ctype) {

  if (ereg("^2",$this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) {

  return true;

  } else {

  $this->m_error .= "类型不对 ".$this->GetHead("content-type")."<br>";

  return false;

  }

  }

  /**

  * 用 HTTP 协议下载文件

  */

  public function SaveToBin($savefilename) {

  if (!$this->IsGetOK()) return false;

  if (@feof($this->m_fp)) {

  $this->m_error = "连接已经关闭!";

  return false;

  }

  $fp = fopen($savefilename,"w") or die("写入文件 $savefilename 失败!");

  while (!feof($this->m_fp)) {

  @fwrite($fp,fgets($this->m_fp,256));

  }

  @fclose($this->m_fp);

  return true;

  }

  /**

  * 保存网页内容为 Text 文件

  */

  public function SaveToText($savefilename) {

  if ($this->IsText()) {

  $this->SaveBinFile($savefilename);

  } else {

  return "";

  }

  }

  /**

  * 用 HTTP 协议获得一个网页的内容

  */

  public function GetHtml() {

  if (!$this->IsText()) return "";

  if ($this->m_html!="") return $this->m_html;

  if (!$this->m_fp||@feof($this->m_fp)) return "";

  while(!feof($this->m_fp)) {

  $this->m_html .= fgets($this->m_fp,256);

  }

  @fclose($this->m_fp);

  return $this->m_html;

  }

  /**

  * 开始 HTTP 会话

  */

  public function PrivateStartSession() {

  if (!$this->PrivateOpenHost()) {

  $this->m_error .= "打开远程主机出错!";

  return false;

  }

  if ($this->GetHead("http-edition")=="HTTP/1.1") {

  $httpv = "HTTP/1.1";

  } else {

  $httpv = "HTTP/1.0";

  }

  fputs($this->m_fp,"GET ".$this->m_urlpath." $httpvrn");

  fputs($this->m_fp,"Host: ".$this->m_host."rn");

  fputs($this->m_fp,"Accept: */*rn");

  fputs($this->m_fp,"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)rn");

  #HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束

  if ($httpv=="HTTP/1.1") {

  fputs($this->m_fp,"Connection: Closernrn");

  } else {

  fputs($this->m_fp,"rn");

  }

  $httpstas = fgets($this->m_fp,256);

  $httpstas = split(" ",$httpstas);

  $this->m_httphead["http-edition"] = trim($httpstas[0]);

  $this->m_httphead["http-state"] = trim($httpstas[1]);

  $this->m_httphead["http-describe"] = "";

  for ($i=2;$i<count($httpstas);$i++) {

  $this->m_httphead["http-describe"] .= " ".trim($httpstas[$i]);

  }

  while (!feof($this->m_fp)) {

  $line = str_replace(""","",trim(fgets($this->m_fp,256)));

  if($line == "") break;

  if (ereg(":",$line)) {

  $lines = split(":",$line);

  $this->m_httphead[strtolower(trim($lines[0]))] = trim($lines[1]);

  }

  }

  }

  /**

  * 获得一个Http头的值

  */

  public function GetHead($headname) {

  $headname = strtolower($headname);

  if (isset($this->m_httphead[$headname])) {

  return $this->m_httphead[$headname];

  } else {

  return "";

  }

  }

  /**

  * 打开连接

  */

  public function PrivateOpenHost() {

  if ($this->m_host=="") return false;

  $this->m_fp = @fsockopen($this->m_host, $this->m_port, &$errno, &$errstr,10);

  if (!$this->m_fp){

  $this->m_error = $errstr;

  return false;

  } else {

  return true;

  }

  }

  /**

  * 关闭连接

  */

  public function Close(){

  @fclose($this->m_fp);

  }

  }

  #两种使用方法,分别如下:

  #打开网页

  $httpdown = new HttpDownload();

  $httpdown->OpenUrl("http://www.google.com.hk");

  echo $httpdown->GetHtml();

  $httpdown->Close();

  #下载文件

  $file = new HttpDownload(); # 实例化类

  $file->OpenUrl("http://www.ti.com.cn/cn/lit/an/rust020/rust020.pdf"); # 远程文件地址

  $file->SaveToBin("rust020.pdf"); # 保存路径及文件名

  $file->Close(); # 释放资源

  ?>
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