经测试代码如下：
/**
* 支持断点续传人远程文件类
*
* @param
* @author 编程之家 jb51.cc jb51.cc
**/
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;
}
}
}
/**
* 打开指定网址
*/
function OpenUrl($url) {
#重设各参数
$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->m_error;
echo 具体返回头：<br>;
foreach($this->m_httphead as $k=>$v) {
echo $k => $v <br>\r\n;
}
}
/**
* 判别用Get方法发送的头的应答结果是否正确
*/
public function IsGetOK() {
if( ereg(^2,$this->GetHead(http-state)) ) {
return true;
} else {
$this->m_error .= $this->GetHead(http-state). - .$this->GetHead(http-describe).<br>;
return false;
}
}
/**
* 看看返回的网页是否是text类型
*/
public function IsText() {
if (ereg(^2,$this->GetHead(http-state)) && eregi(^text,$this->GetHead(content-type))) {
return true;
} else {
$this->m_error .= 内容为非文本类型<br>;
return false;
}
}
/**
* 判断返回的网页是否是特定的类型
*/
public function IsContentType($ctype) {
if (ereg(^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
*/
public 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) or die(写入文件 $savefilename 失败！);
while (!feof($this->m_fp)) {
@fwrite($fp,fgets($this->m_fp,256));
}
@fclose($this->m_fp);
return true;
}
/**
* 保存网页内容为 Text 文件
*/
public function SaveToText($savefilename) {
if ($this->IsText()) {
$this->SaveBinFile($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->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 $this->m_html;
}
/**
* 开始 HTTP 会话
*/
public function PrivateStartSession() {
if (!$this->PrivateOpenHost()) {
$this->m_error .= 打开远程主机出错!;
return false;
}
if ($this->GetHead(http-edition)==HTTP/1.1) {
$httpv = HTTP/1.1;
} else {
$httpv = HTTP/1.0;
}
fputs($this->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);
}
$httpstas = fgets($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($lines[1]);
}
}
}
/**
* 获得一个Http头的值
*/
public function GetHead($headname) {
$headname = strtolower($headname);
if (isset($this->m_httphead[$headname])) {
return $this->m_httphead[$headname];
} else {
return ;
}
}
/**
* 打开连接
*/
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 = $errstr;
return false;
} else {
return true;
}
}
/**
* 关闭连接
*/
public function Close(){
@fclose($this->m_fp);
}
}
#两种使用方法，分别如下：
#打开网页
$httpdown = new HttpDownload();
$httpdown->OpenUrl(http://jb51.cc);
echo $httpdown->GetHtml();
$httpdown->Close();
#下载文件
$file = new HttpDownload(); # 实例化类
$file->OpenUrl(http://www.danbaise.com/cn/lit/an/rust020/rust020.pdf); # 远程文件地址
$file->SaveToBin(rust020.pdf); # 保存路径及文件名
$file->Close(); # 释放资源
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