摘自织梦CMS的HTTP文件下载类

            本文实例讲述了摘自织梦CMS的HTTP文件下载类。分享给大家供大家参考。具体如下：
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;
   }
   $this->HomeUrl = $urls["host"];
   $this->BaseUrlPath = $this->HomeUrl.$urls["path"];
   $this->BaseUrlPath = preg_replace("/\/([^\/]*)\.(.*)$/","/",$this->BaseUrlPath);
   $this->BaseUrlPath = preg_replace("/\/$/","",$this->BaseUrlPath);
  }
}
/**
  * 重设各参数
  *
  * @access public
  * @return void
  */
function ResetAny()
{
  $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 = "";
}
/**
  * 打开指定网址
  *
  * @access public
  * @param  string $url 地址
  * @param  string $requestType 请求类型
  * @return string
  */
function OpenUrl($url,$requestType="GET")
{
  $this->ResetAny();
  $this->JumpCount = 0;
  $this->m_httphead = Array() ;
  $this->m_html = '';
  $this->reTry = 0;
  $this->Close();
  //初始化系统
  $this->rivateInit($url);
  $this->rivateStartSession($requestType);
}
/**
  * 转到303重定向网址
  *
  * @access public
  * @param  string $url 地址
  * @return string
  */
function JumpOpenUrl($url)
{
  $this->ResetAny();
  $this->JumpCount++;
  $this->m_httphead = Array() ;
  $this->m_html = "";
  $this->Close();
  //初始化系统
  $this->rivateInit($url);
  $this->rivateStartSession('GET');
}
/**
  * 获得某操作错误的原因
  *
  * @access public
  * @return void
  */
function printError()
{
  echo "错误信息：".$this->m_error;
  echo "
具体返回头：
";
  foreach($this->m_httphead as $k=>$v){ echo "$k => $v
\r\n"; }
}
/**
  * 判别用Get方法发送的头的应答结果是否正确
  *
  * @access public
  * @return bool
  */
function IsGetOK()
{
  if( preg_match("/^2/",$this->GetHead("http-state")) )
  {
   return TRUE;
  }
  else
  {
   $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."
";
   return FALSE;
  }
}
/**
  * 看看返回的网页是否是text类型
  *
  * @access public
  * @return bool
  */
function IsText()
{
  if( preg_match("/^2/",$this->GetHead("http-state")) && preg_match("/text|xml/i",$this->GetHead("content-type")) )
  {
   return TRUE;
  }
  else
  {
   $this->m_error .= "内容为非文本类型或网址重定向
";
   return FALSE;
  }
}
/**
  * 判断返回的网页是否是特定的类型
  *
  * @access public
  * @param  string $ctype 内容类型
  * @return string
  */
function IsContentType($ctype)
{
  if(preg_match("/^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")."
";
   return FALSE;
  }
}
/**
  * 用Http协议下载文件
  *
  * @access public
  * @param  string $savefilename 保存文件名称
  * @return string
  */
function SaveToBin($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");
  while(!feof($this->m_fp))
  {
   fwrite($fp, fread($this->m_fp, 1024));
  }
  fclose($this->m_fp);
  fclose($fp);
  return TRUE;
}
/**
  * 保存网页内容为Text文件
  *
  * @access public
  * @param  string $savefilename 保存文件名称
  * @return string
  */
function SaveToText($savefilename)
{
  if($this->IsText())
  {
   $this->SaveBinFile($savefilename);
  }
  else
  {
   return "";
  }
}
/**
  * 用Http协议获得一个网页的内容
  *
  * @access public
  * @return string
  */
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
  *
  * @access public
  * @param  string $requestType 请求类型
  * @return string
  */
function PrivateStartSession($requestType="GET")
{
  if(!$this->rivateOpenHost())
  {
   $this->m_error .= "打开远程主机出错!";
   return FALSE;
  }
  $this->reTry++;
  if($this->GetHead("http-edition")=="HTTP/1.1")
  {
   $httpv = "HTTP/1.1";
  }
  else
  {
   $httpv = "HTTP/1.0";
  }
  $ps = explode('?',$this->m_urlpath);
  $headString = '';
  //发送固定的起始请求头GET、Host信息
  if($requestType=="GET")
  {
   $headString .= "GET ".$this->m_urlpath." $httpv\r\n";
  }
  else
  {
   $headString .= "OST ".$ps[0]." $httpv\r\n";
  }
  $this->m_puthead["Host"] = $this->m_host;
  //发送用户自定义的请求头
  if(!isset($this->m_puthead["Accept"]))
  {
   $this->m_puthead["Accept"] = "*/*";
  }
  if(!isset($this->m_puthead["User-Agent"]))
  {
   $this->m_puthead["User-Agent"] = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2)";
  }
  if(!isset($this->m_puthead["Refer"]))
  {
   $this->m_puthead["Refer"] = "http://".$this->m_puthead["Host"];
  }
  foreach($this->m_puthead as $k=>$v)
  {
   $k = trim($k);
   $v = trim($v);
   if($k!=""&&$v!="")
   {
    $headString .= "$k: $v\r\n";
   }
  }
  fputs($this->m_fp, $headString);
  if($requestType=="OST")
  {
   $postdata = "";
   if(count($ps)>1)
   {
    for($i=1;$im_fp,"Content-Type: application/x-www-form-urlencoded\r\n");
   fputs($this->m_fp,"Content-Length: $plen\r\n");
  }
  //发送固定的结束请求头
  //HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束
  if($httpv=="HTTP/1.1")
  {
   fputs($this->m_fp,"Connection: Close\r\n\r\n");
  }
  else
  {
   fputs($this->m_fp,"\r\n");
  }
  if($requestType=="OST")
  {
   fputs($this->m_fp,$postdata);
  }
  //获取应答头状态信息
  $httpstas = explode(" ",fgets($this->m_fp,256));
  $this->m_httphead["http-edition"] = trim($httpstas[0]);
  $this->m_httphead["http-state"] = trim($httpstas[1]);
  $this->m_httphead["http-describe"] = "";
  for($i=2;$im_httphead["http-describe"] .= " ".trim($httpstas[$i]);
  }
  //获取详细应答头
  while(!feof($this->m_fp))
  {
   $line = trim(fgets($this->m_fp,256));
   if($line == "")
   {
    break;
   }
   $hkey = "";
   $hvalue = "";
   $v = 0;
   for($i=0;$im_httphead[strtolower($hkey)] = trim($hvalue);
   }
  }
  //如果连接被不正常关闭，重试
  if(feof($this->m_fp))
  {
   if($this->reTry > 10)
   {
    return FALSE;
   }
   $this->rivateStartSession($requestType);
  }
  //判断是否是3xx开头的应答
  if(preg_match("/^3/",$this->m_httphead["http-state"]))
  {
   if($this->JumpCount > 3)
   {
    return;
   }
   if(isset($this->m_httphead["location"]))
   {
    $newurl = $this->m_httphead["location"];
    if(preg_match("/^http/i",$newurl))
    {
     $this->JumpOpenUrl($newurl);
    }
    else
    {
     $newurl = $this->FillUrl($newurl);
     $this->JumpOpenUrl($newurl);
    }
   }
   else
   {
    $this->m_error = "无法识别的答复！";
   }
  }
}
/**
  * 获得一个Http头的值
  *
  * @access public
  * @param  string $headname 头文件名称
  * @return string
  */
function GetHead($headname)
{
  $headname = strtolower($headname);
  return isset($this->m_httphead[$headname]) ? $this->m_httphead[$headname] : '';
}
/**
  * 设置Http头的值
  *
  * @access public
  * @param  string $skey 键
  * @param  string $svalue 值
  * @return string
  */
function SetHead($skey,$svalue)
{
  $this->m_puthead[$skey] = $svalue;
}
/**
  * 打开连接
  *
  * @access public
  * @return bool
  */
function PrivateOpenHost()
{
  if($this->m_host=="")
  {
   return FALSE;
  }
  $errno = "";
  $errstr = "";
  $this->m_fp = @fsockopen($this->m_host, $this->m_port, $errno, $errstr,10);
  if(!$this->m_fp)
  {
   $this->m_error = $errstr;
   return FALSE;
  }
  else
  {
   return TRUE;
  }
}
/**
  * 关闭连接
  *
  * @access public
  * @return void
  */
function Close()
{
  @fclose($this->m_fp);
}
/**
  * 补全相对网址
  *
  * @access public
  * @param  string $surl 需要不全的地址
  * @return string
  */
function FillUrl($surl)
{
  $i = 0;
  $dstr = "";
  $pstr = "";
  $okurl = "";
  $pathStep = 0;
  $surl = trim($surl);
  if($surl=="")
  {
   return "";
  }
  $pos = strpos($surl,"#");
  if($pos>0)
  {
   $surl = substr($surl,0,$pos);
  }
  if($surl[0]=="/")
  {
   $okurl = "http://".$this->HomeUrl.$surl;
  }
  else if($surl[0]==".")
  {
   if(strlen($surl)BaseUrlPath."/".substr($surl,2,strlen($surl)-2);
   }
   else
   {
    $urls = explode("/",$surl);
    foreach($urls as $u)
    {
     if($u=="..")
     {
      $pathStep++;
     }
     else if($iBaseUrlPath);
    if(count($urls) BaseUrlPath."/".$surl;
   }
   else if(strtolower(substr($surl,0,7))=="http://")
   {
    $okurl = $surl;
   }
   else
   {
    $okurl = "http://".$this->BaseUrlPath."/".$surl;
   }
  }
  $okurl = preg_replace("/^(http:\/\/)/i","",$okurl);
  $okurl = preg_replace("/\/{1,}/", "/", $okurl);
  return "http://".$okurl;
}
}//End Class
希望本文所述对大家的php程序设计有所帮助。
            
            
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