php网页分析内容抓取爬虫资料分析

程序员文章站 2024-02-17 18:59:04

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php网页分析内容抓取爬虫文件分析

//获取所有内容url保存到文件
function get_index($save_file, $prefix="index_"){
$count = 68;
$i = 1;
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open ". $save_file ." failed");
while($i $url = $prefix . $i .".htm";
echo "Get ". $url ."...";
$url_str = get_content_url(get_url($url));
echo " OK\n";
fwrite($fp, $url_str);
++$i;
}
fclose($fp);
}

//获取目标多媒体对象
function get_object($url_file, $save_file, $split="|--:**:--|"){
if (!file_exists($url_file)) die($url_file ." not exist");
$file_arr = file($url_file);
if (!is_array($file_arr) || empty($file_arr)) die($url_file ." not content");
$url_arr = array_unique($file_arr);
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open save file ". $save_file ." failed");
foreach($url_arr as $url){
if (empty($url)) continue;
echo "Get ". $url ."...";
$html_str = get_url($url);
echo $html_str;
echo $url;
exit;
$obj_str = get_content_object($html_str);
echo " OK\n";
fwrite($fp, $obj_str);
}
fclose($fp);
}

//遍历目录获取文件内容
function get_dir($save_file, $dir){
$dp = opendir($dir);
if (file_exists($save_file)) @unlink($save_file);
$fp = fopen($save_file, "a+") or die("Open save file ". $save_file ." failed");
while(($file = readdir($dp)) != false){
if ($file!="." && $file!=".."){
echo "Read file ". $file ."...";
$file_content = file_get_contents($dir . $file);
$obj_str = get_content_object($file_content);
echo " OK\n";
fwrite($fp, $obj_str);
}
}
fclose($fp);
}

//获取指定url内容
function get_url($url){
$reg = '/^http:\/\/[^\/].+$/';
if (!preg_match($reg, $url)) die($url ." invalid");
$fp = fopen($url, "r") or die("Open url: ". $url ." failed.");
while($fc = fread($fp, 8192)){
$content .= $fc;
}
fclose($fp);
if (empty($content)){
die("Get url: ". $url ." content failed.");
}
return $content;
}

//使用socket获取指定网页
function get_content_by_socket($url, $host){
$fp = fsockopen($host, 80) or die("Open ". $url ." failed");
$header = "GET /".$url ." HTTP/1.1\r\n";
$header .= "Accept: */*\r\n";
$header .= "Accept-Language: zh-cn\r\n";
$header .= "Accept-Encoding: gzip, deflate\r\n";
$header .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1; .NET CLR 2.0.50727)\r\n";
$header .= "Host: ". $host ."\r\n";
$header .= "Connection: Keep-Alive\r\n";
//$header .= "Cookie: cnzz02=2; rtime=1; ltime=1148456424859; cnzz_eid=56601755-\r\n\r\n";
$header .= "Connection: Close\r\n\r\n";

fwrite($fp, $header);
while (!feof($fp)) {
$contents .= fgets($fp, 8192);
}
fclose($fp);
return $contents;
}

//获取指定内容里的url
function get_content_url($host_url, $file_contents){

//$reg = '/^(#|javascript.*?|ftp:\/\/.+|http:\/\/.+|.*?href.*?|play.*?|index.*?|.*?asp)+$/i';
//$reg = '/^(down.*?\.html|\d+_\d+\.htm.*?)$/i';
$rex = "/([hH][rR][eE][Ff])\s*=\s*['\"]*([^>'\"\s]+)[\"'>]*\s*/i";
$reg = '/^(down.*?\.html)$/i';
preg_match_all ($rex, $file_contents, $r);
$result = ""; //array();
foreach($r as $c){
if (is_array($c)){
foreach($c as $d){
if (preg_match($reg, $d)){ $result .= $host_url . $d."\n"; }
}
}
}
return $result;
}

//获取指定内容中的多媒体文件
function get_content_object($str, $split="|--:**:--|"){
$regx = "/href\s*=\s*['\"]*([^>'\"\s]+)[\"'>]*\s*(.*?)/i";
preg_match_all($regx, $str, $result);

if (count($result) == 3){
$result[2] = str_replace("多媒体： ", "", $result[2]);
$result[2] = str_replace("", "", $result[2]);
$result = $result[1][0] . $split .$result[2][0] . "\n";
}
return $result;
}

?>

//PHP 访问网页
$page = '';
$handler = fopen('http://www.baidu.com','r');
while(!feof($handler)){
$page.=fread($handler,1048576);
}
fclose($handler);
echo $page;
?>

2:判断这个页面是否是报错页面

/**
* $host 服务器地址
* $get 请求页面
*
*/
function getHttpStatus($host,$get="") {
$fp = fsockopen($host, 80);
if (!$fp) {
$res= -1;
} else {

fwrite($fp, "GET /".$get." HTTP/1.0\r\n\r\n");
stream_set_timeout($fp, 2);
$res = fread($fp, 128);
$info = stream_get_meta_data($fp);
fclose($fp);
if ($info['timed_out']) {
$res=0;
} else {
$res= substr($res,9,3);
}
}
return $res;
}

$good=array("200","302");
if(in_array(getHttpStatus("5y.nuc.edu.cn","/"),$good)) {
echo "正常";
} else {
echo getHttpStatus("5y.nuc.edu.cn","/");
}

if(in_array(getHttpStatus("5y.nuc.edu.cn","/error.php"),$good)) {
echo "正常";
} else {
echo getHttpStatus("5y.nuc.edu.cn","/error.php");
}
?>

返回
第一个返回"正常"
第二个不存在返回"404"

function getHttpStatus($host,$get="") {
//访问网页获得服务器状态码
$fp = fsockopen($host, 80);
if (!$fp) {
$res= -1;
} else {

fwrite($fp, "GET /".$get." HTTP/1.0\r\n\r\n");
stream_set_timeout($fp, 2);
$res = fread($fp, 128);
$info = stream_get_meta_data($fp);
fclose($fp);
if ($info['timed_out']) {
$res=0;
} else {
$res= substr($res,9,3);
}
}
return $res;
}

echo getHttpStatus("5y.nuc.edu.cn","/");
echo getHttpStatus("community.csdn.net","Expert/topic/4758/4758574.xml?temp=.1661646");

返回
1 无法连接服务器
0 超时
200 OK (成功返回)
302 Found (找到)
404 没有找到
...

//遍历所有网页 ($type指定类型)
function getAllPage($path="./",$type=array("html","htm")) {
global $p;
if ($handle = opendir($path)) {
while (false !== ($file = readdir($handle))) {
if(is_dir($file) && $file!="." && $file!="..") {
getAllPage($path.$file."/",$type);
} else {
$ex=array_pop(explode(".",$file));

if(in_array(strtolower($ex),$type)) {
array_push($p, $path.$file);
}
}
}
closedir($handle);
}
}

$p=array();
getAllPage("./");
echo "
";
print_r($p);
echo "
";

?>

//抓取页面内容中所有URL。
$str='2006年05月30日 15:13:00 | 评论 (0)';

preg_match_all("/href=\"([^\"]*\.*php[^\"]*)\"/si",$str,$m);
//换用下面这个获取所有类型URL
//preg_match_all("/href=\"([^\"]*)\"/si",$str,$m);

print_r($m[1]);
?>

包含在链接里带get参数的地址
$str=file_get_contents("http://www.php.net");
preg_match_all("/href=\"([^\"]*\.*php\?[^\"]*)\"/si",$str,$m);
print_r($m[1]);
?>

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php网页分析内容抓取爬虫资料分析