摘自织梦CMS的HTTP文件下载类【PHP】

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 "
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->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($i=1;$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($requestType=="POST") { fputs($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;$im_httphead["http-describe"] .= " ".trim($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; } $this->PrivateStartSession($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($surl)BaseUrlPath."/".substr($surl,2,strlen($surl)-2); } else { $urls = explode("/",$surl); foreach($urls as $u) { if($u=="..") { $pathStep++; } else if($iBaseUrlPath); if(count($urls) <= $pathStep) { return ""; } else { $pstr = "http://"; for($i=0;$iBaseUrlPath."/".$surl; } } $okurl = preg_replace("/^(http:\/\/)/i","",$okurl); $okurl = preg_replace("/\/{1,}/", "/", $okurl); return "http://".$okurl; }}//End Class