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：
<?php if(!defined('DEDEINC')) exit("Request Error!");
/**
* 织梦HTTP下载类
*
* @version $Id: dedehttpdown.class.php 1 11:42 2010年7月6日Z tianya $
* @package DedeCMS.Libraries
* @copyright Copyright (c) 2007 - 2010, DesDev, Inc.
* @license http://help.dedecms.com/usersguide/license.html
* @link http://www.dedecms.com
*/
@set_time_limit(0);
class DedeHttpDown
{
var $m_url = '';
var $m_urlpath = '';
var $m_scheme = 'http';
var $m_host = '';
var $m_port = '80';
var $m_user = '';
var $m_pass = '';
var $m_path = '/';
var $m_query = '';
var $m_fp = '';
var $m_error = '';
var $m_httphead = '';
var $m_html = '';
var $m_puthead = '';
var $BaseUrlPath = '';
var $HomeUrl = '';
var $reTry = 0;
var $JumpCount = 0;
/**
* 初始化系统
*
* @access public
* @param string $url 需要下载的地址
* @return string
*/
function PrivateInit($url)
{
if($url=='') {
return ;
}
$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;
}
$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
$this->PrivateInit($url);
$this->PrivateStartSession($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
$this->PrivateInit($url);
$this->PrivateStartSession('GET');
}
/**
* 获得某操作错误的原因
*
* @access public
* @return void
*/
function printError()
{
echo "错误信息：".$this->m_error;
echo "<br/>具体返回头：<br/>";
foreach($this->m_httphead as $k=>$v){ echo "$k => $v <br/>\r\n"; }
}
/**
* 判别用Get方法发送的头的应答结果是否正确
*
* @access public
* @return bool
*/
function IsGetOK()
{
if( preg_match("/^2/",$this->GetHead("http-state")) )
{
return TRUE;
}
else
{
$this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br/>";
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<br/>";
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")."<br/>";
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->PrivateOpenHost())
{
$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
{
$headString .= "POST ".$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=="POST")
{
$postdata = "";
if(count($ps)>1)
{
for($i=1;$i<count($ps);$i++)
{
$postdata .= $ps[$i];
}
}
else
{
$postdata = "OK";
}
$plen = strlen($postdata);
fputs($this->m_fp,"Content-Type: application/x-www-form-urlencoded\r\n");
fputs($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($requestType=="POST")
{
fputs($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;$i<count($httpstas);$i++)
{
$this->m_httphead["http-describe"] .= " ".trim($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;$i<strlen($line);$i++)
{
if($v==1)
{
$hvalue .= $line[$i];
}
if($line[$i]==":")
{
$v = 1;
}
if($v==0)
{
$hkey .= $line[$i];
}
}
$hkey = trim($hkey);
if($hkey!="")
{
$this->m_httphead[strtolower($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;
}
$this->PrivateStartSession($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($surl)<=1)
{
return "";
}
else if($surl[1]=="/")
{
$okurl = "http://".$this->BaseUrlPath."/".substr($surl,2,strlen($surl)-2);
}
else
{
$urls = explode("/",$surl);
foreach($urls as $u)
{
if($u=="..")
{
$pathStep++;
}
else if($i<count($urls)-1)
{
$dstr .= $urls[$i]."/";
}
else
{
$dstr .= $urls[$i];
}
$i++;
}
$urls = explode("/",$this->BaseUrlPath);
if(count($urls) <= $pathStep)
{
return "";
}
else
{
$pstr = "http://";
for($i=0;$i<count($urls)-$pathStep;$i++)
{
$pstr .= $urls[$i]."/";
}
$okurl = $pstr.$dstr;
}
}
}
else
{
if(strlen($surl)<7)
{
$okurl = "http://".$this->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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