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：" . $this->m_error;
echo "具体返回头：
";
foreach ($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
*/
public function IsGetOK()
{
if (ereg("^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
*/
public function IsText()
{
if (ereg("^2", $this->GetHead("http-state")) && eregi("^text", $this->GetHead("content-type"))) {
return true;
} else {
$this->m_error .= "内容为非文本类型
";
return false;
}
}
/**
* 判断返回的网页是否是特定的类型
*/
public function IsContentType($ctype)
{
if (ereg("^2", $this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) {
return true;
} else {
$this->m_error .= "类型不对 " . $this->GetHead("content-type") . "
";
return false;
}
}
/**
* 用 HTTP 协议下载文件
*/
public function SaveToBin($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://www.google.com.hk");
echo $httpdown->GetHtml();
$httpdown->Close();
#下载文件
$file = new HttpDownload(); # 实例化类
$file->OpenUrl("http://www.ti.com.cn/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();
*/