php代码如下:
复制代码 代码如下:
<?php
header("Content-type:text/html ; charset=utf-8");
if (!empty($_POST["submit"])){
$url = $_POST["url"];
//为了获取相对路径的图片所做的操作
$url_fields = parse_url($url);
$main_url = $url_fields["host"];
$base_url = substr($url,0,strrpos($url, "/")+1);
//获取网页内容
//设置代理服务器
$opts = array("http"=>array("request_fulluri"=>true));
$context = stream_context_create($opts);
$content = file_get_contents($url,false,$context);
//匹配img标签,将所有匹配字符串保存到数组$matches
$reg = "/<img.*?src="(.*?)".*?>/i";
preg_match_all($reg, $content, $matches);
$count = count($matches[0]);
for ($i=0; $i<$count; $i++){
/*将所有图片的url转换为小写
*$matches[1][$i] = strtolower($matches[1][$i]);
*/
//如果图片为相对路径就转化为全路径
if (!strpos("a".$matches[1][$i], "http")){
//因为"/"是第0个位置
if (strpos("a".$matches[1][$i], "/")){
$matches[1][$i] = "http://".$main_url.$matches[1][$i];
}else{
$matches[1][$i] = $base_url.$matches[1][$i];
}
}
}
//过滤重复的图片
$img_arr = array_unique($matches[1]);
//实例化图片下载类
$getImg = new DownImage();
$url_count = count($img_arr);
for ($i=0; $i<$url_count; $i++){
$getImg->source = $img_arr[$i];
$getImg->save_address = "./pic/";
$file = $getImg->download();
}
echo "下载完成！哈哈，简单吧！";
}
class DownImage{
public $source;//远程图片URL
public $save_address;//保存本地地址
public $set_extension; //设置图片扩展名
public $quality; //图片的质量（0~100,100最佳，默认75左右）
//下载方法（选用GD库图片下载）
public function download(){
//获取远程图片信息
$info = @getimagesize($this->source);
//获取图片扩展名
$mime = $info["mime"];
$type = substr(strrchr($mime, "/"), 1);
//不同的图片类型选择不同的图片生成和保存函数
switch($type){
case "jpeg":
$img_create_func = "imagecreatefromjpeg";
$img_save_func = "imagejpeg";
$new_img_ext = "jpg";
$image_quality = isset($this->quality) ? $this->quality : 100;
break;
case "png":
$img_create_func = "imagecreatefrompng";
$img_save_func = "imagepng";
$new_img_ext = "png";
break;
case "bmp":
$img_create_func = "imagecreatefrombmp";
$img_save_func = "imagebmp";
$new_img_ext = "bmp";
break;
case "gif":
$img_create_func = "imagecreatefromgif";
$img_save_func = "imagegif";
$new_img_ext = "gif";
break;
case "vnd.wap.wbmp":
$img_create_func = "imagecreatefromwbmp";
$img_save_func = "imagewbmp";
$new_img_ext = "bmp";
break;
case "xbm":
$img_create_func = "imagecreatefromxbm";
$img_save_func = "imagexbm";
$new_img_ext = "xbm";
break;
default:
$img_create_func = "imagecreatefromjpeg";
$img_save_func = "imagejpeg";
$new_img_ext = "jpg";
}
//根据是否设置扩展名来合成本地文件名
if (isset($this->set_extension)){
$ext = strrchr($this->source,".");
$strlen = strlen($ext);
$newname = basename(substr($this->source,0,-$strlen)).".".$new_img_ext;
}else{
$newname = basename($this->source);
} //生成本地文件路径
$save_address = $this->save_address.$newname;
$img = @$img_create_func($this->source);
if (isset($image_quality)){
$save_img = @$img_save_func($img,$save_address,$image_quality);
}else{
$save_img = @$img_save_func($img,$save_address);
}
return $save_img;
}
}
?>
<form method="POST" action="">
远程url地址：<input type="text" name="url" size=30 />
<input type="submit" name="submit" value="下载该页面所有图片" />
</form>

运行结果如图：

下载的图片本例中保存在当前目录的pic文件夹下！