下载类示例
<?php
namespace App\Libraries;
/**
* 下载远程文件类支持断点续传
*/
class HttpDownload {
private $mUrl = "";
private $mUrlPath = "";
private $mScheme = "http";
private $mHost = "";
private $mPort = "80";
private $mUser = "";
private $mPass = "";
private $mPath = "/";
private $mQuery = "";
private $mFp = null;
private $mError = "";
private $mHttpHead = [];
private $mHtml = "";
/**
* 初始化
*/
public function PrivateInit($url){
$urls = "";
$urls = @parse_url($url);
$this->mUrl = $url;
if(is_array($urls)) {
$this->mHost = $urls["host"];
if(!empty($urls["scheme"])) $this->mScheme = $urls["scheme"];
if(!empty($urls["user"])) $this->mUser = $urls["user"];
if(!empty($urls["pass"])) $this->mPass = $urls["pass"];
if(!empty($urls["port"])) $this->mPort = $urls["port"];
if(!empty($urls["path"])) $this->mPath = $urls["path"];
$this->mUrlPath = $this->mPath;
if(!empty($urls["query"])) {
$this->mQuery = $urls["query"];
$this->mUrlPath .= "?".$this->mQuery;
}
}
}
/**
* 打开指定网址
*/
function OpenUrl($url) {
#重设各参数
$this->mUrl = "";
$this->mUrlPath = "";
$this->mScheme = "http";
$this->mHost = "";
$this->mPort = "80";
$this->mUser = "";
$this->mPass = "";
$this->mPath = "/";
$this->mQuery = "";
$this->mError = "";
$this->mHttpHead = [] ;
$this->mHtml = "";
$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->mError;
echo "具体返回头:<br>";
foreach($this->mHttpHead as $k=>$v) {
echo "$k => $v <br>\r\n";
}
}
/**
* 判别用Get方法发送的头的应答结果是否正确
*/
public function IsGetOK() {
if( preg_match('#^2#',$this->GetHead("http-state")) ) {
return true;
} else {
$this->mError .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br>";
return false;
}
}
/**
* 看看返回的网页是否是text类型
*/
public function IsText() {
if (preg_match('#^2#',$this->GetHead("http-state")) && preg_match('#^text#i',$this->GetHead("content-type"))) {
return true;
} else {
$this->mError .= "内容为非文本类型<br>";
return false;
}
}
/**
* 判断返回的网页是否是特定的类型
*/
public function IsContentType($ctype) {
if (preg_match('#^2#',$this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) {
return true;
} else {
$this->mError .= "类型不对 ".$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->mFp)) {
$this->mError = "连接已经关闭!";
return false;
}
$fp = fopen($savefilename,"w+") or die("写入文件 $savefilename 失败!");
while (!feof($this->mFp)) {
@fwrite($fp,fgets($this->mFp,256));
}
@fclose($this->mFp);
return true;
}
/**
* 保存网页内容为 Text 文件
*/
public function SaveToText($savefilename) {
if ($this->IsText()) {
$this->SaveToBin($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->mHtml!="") return $this->mHtml;
if (!$this->mFp||@feof($this->mFp)) return "";
while(!feof($this->mFp)) {
$this->mHtml .= fgets($this->mFp,256);
}
@fclose($this->mFp);
return $this->mHtml;
}
/**
* 开始 HTTP 会话
*/
public function PrivateStartSession() {
if (!$this->PrivateOpenHost()) {
$this->mError .= "打开远程主机出错!";
return false;
}
if ($this->GetHead("http-edition")=="HTTP/1.1") {
$httpv = "HTTP/1.1";
} else {
$httpv = "HTTP/1.0";
}
fputs($this->mFp,"GET ".$this->mUrlPath." $httpv\r\n");
fputs($this->mFp,"Host: ".$this->mHost."\r\n");
fputs($this->mFp,"Accept: */*\r\n");
fputs($this->mFp,"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)\r\n");
#HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束
if ($httpv=="HTTP/1.1") {
fputs($this->mFp,"Connection: Close\r\n\r\n");
} else {
fputs($this->mFp,"\r\n");
}
$httpstas = fgets($this->mFp,256);
$httpstas = explode(' ',$httpstas);
$this->mHttpHead["http-edition"] = trim($httpstas[0]);
$this->mHttpHead["http-state"] = trim($httpstas[1]);
$this->mHttpHead["http-describe"] = "";
for ($i=2;$i<count($httpstas);$i++) {
$this->mHttpHead["http-describe"] .= " ".trim($httpstas[$i]);
}
while (!feof($this->mFp)) {
$line = str_replace("\"","",trim(fgets($this->mFp,256)));
if($line == "") break;
if (preg_match('#:#',$line)) {
$lines = explode(':',$line);
$this->mHttpHead[strtolower(trim($lines[0]))] = trim($lines[1]);
}
}
}
/**
* 获得一个Http头的值
*/
public function GetHead($headname) {
$headname = strtolower($headname);
if (isset($this->mHttpHead[$headname])) {
return $this->mHttpHead[$headname];
} else {
return "";
}
}
/**
* 打开连接
*/
public function PrivateOpenHost() {
if ($this->mHost=="") return false;
$this->mFp = @fsockopen($this->mHost, $this->mPort, $errno, $errstr,10);
if (!$this->mFp){
$this->mError = $errstr;
return false;
} else {
return true;
}
}
/**
* 关闭连接
*/
public function Close(){
@fclose($this->mFp);
}
}
使用示例
#下载文件
$file = new HttpDownload(); # 实例化类
$file->OpenUrl($remoteFileUrl); # 远程文件地址
$file->SaveToBin($localFile); # 保存路径及文件名
$file->Close(); # 释放资源
请成为永远疯狂永远浪漫永远清澈的存在。