<?php
/**
 * 下載遠(yuǎn)程文件類支持?jǐn)帱c(diǎn)續(xù)傳
 */
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;
            }
        }
    }
  
    /**
    * 打開(kāi)指定網(wǎng)址
    */
    function OpenUrl($url) {
        #重設(shè)各參數(shù)
        $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();
        #初始化系統(tǒng)
        $this->PrivateInit($url);
        $this->PrivateStartSession();
    }
 
    /**
    * 獲得某操作錯(cuò)誤的原因
    */
    public function printError() {
        echo "錯(cuò)誤信息：".$this->m_error;
        echo "具體返回頭：<br>";
        foreach($this->m_httphead as $k=>$v) {
            echo "$k => $v <br>\r\n";
        }
    }
  
    /**
    * 判別用Get方法發(fā)送的頭的應(yīng)答結(jié)果是否正確
    */
    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;
        }
    }
     
    /**
    * 看看返回的網(wǎng)頁(yè)是否是text類型
    */
    public function IsText() {
        if (ereg("^2",$this->GetHead("http-state")) && eregi("^text",$this->GetHead("content-type"))) {
            return true;
        } else {
            $this->m_error .= "內(nèi)容為非文本類型<br>";
            return false;
        }
    }
    /**
    * 判斷返回的網(wǎng)頁(yè)是否是特定的類型
    */
    public function IsContentType($ctype) {
        if (ereg("^2",$this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) {
            return true;
        } else {
            $this->m_error .= "類型不對(duì) ".$this->GetHead("content-type")."<br>";
            return false;
        }
    }
     
    /**
    * 用 HTTP 協(xié)議下載文件
    */
    public function SaveToBin($savefilename) {
        if (!$this->IsGetOK()) return false;
        if (@feof($this->m_fp)) {
            $this->m_error = "連接已經(jīng)關(guān)閉！";
            return false;
        }
        $fp = fopen($savefilename,"w") or die("寫入文件 $savefilename 失�。�");
        while (!feof($this->m_fp)) {
            @fwrite($fp,fgets($this->m_fp,256));
        }
        @fclose($this->m_fp);
        return true;
    }
     
    /**
    * 保存網(wǎng)頁(yè)內(nèi)容為 Text 文件
    */
    public function SaveToText($savefilename) {
        if ($this->IsText()) {
            $this->SaveBinFile($savefilename);
        } else {
            return "";
        }
    }
     
    /**
    * 用 HTTP 協(xié)議獲得一個(gè)網(wǎng)頁(yè)的內(nèi)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;
    }
     
    /**
    * 開(kāi)始 HTTP 會(huì)話
    */
    public function PrivateStartSession() {
        if (!$this->PrivateOpenHost()) {
            $this->m_error .= "打開(kāi)遠(yuǎn)程主機(jī)出錯(cuò)!";
            return false;
        }
        if ($this->GetHead("http-edition")=="HTTP/1.1") {
            $httpv = "HTTP/1.1";
        } else {
            $httpv = "HTTP/1.0";
        }
        fputs($this->m_fp,"GET ".$this->m_urlpath." $httpv\r\n");
        fputs($this->m_fp,"Host: ".$this->m_host."\r\n");
        fputs($this->m_fp,"Accept: */*\r\n");
        fputs($this->m_fp,"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)\r\n");
        #HTTP1.1協(xié)議必須指定文檔結(jié)束后關(guān)閉鏈接,否則讀取文檔時(shí)無(wú)法使用feof判斷結(jié)束
        if ($httpv=="HTTP/1.1") {
            fputs($this->m_fp,"Connection: Close\r\n\r\n");
        } else {
            fputs($this->m_fp,"\r\n");
        }
        $httpstas = fgets($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]);
            }
        }
    }
     
    /**
    * 獲得一個(gè)Http頭的值
    */
    public function GetHead($headname) {
        $headname = strtolower($headname);
        if (isset($this->m_httphead[$headname])) {
            return $this->m_httphead[$headname];
        } else {
            return "";
        }
    }
     
    /**
    * 打開(kāi)連接
    */
    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;
        }
    }
     
    /**
    * 關(guān)閉連接
    */
    public function Close(){
        @fclose($this->m_fp);
    }
}
 
#兩種使用方法，分別如下：
 
#打開(kāi)網(wǎng)頁(yè)
$httpdown = new HttpDownload();
$httpdown->OpenUrl("http://www.ijingxuan.com");
echo $httpdown->GetHtml();
$httpdown->Close();
 
 
#下載文件
$file = new HttpDownload(); # 實(shí)例化類
$file->OpenUrl("http://www.danbaise.com/cn/lit/an/rust020/rust020.pdf"); # 遠(yuǎn)程文件地址
$file->SaveToBin("rust020.pdf"); # 保存路徑及文件名
$file->Close(); # 釋放資源
?>

標(biāo)簽：

版權(quán)申明：本站文章部分自網(wǎng)絡(luò)，如有侵權(quán)，請(qǐng)聯(lián)系：west999com@outlook.com
特別注意：本站所有轉(zhuǎn)載文章言論不代表本站觀點(diǎn)！
本站所提供的圖片等素材，版權(quán)歸原作者所有，如需使用，請(qǐng)與原作者聯(lián)系。