如何使用JSoup从URL中提取图像类型?我正在解析一个html,它可以发送图像url(使用asbUrl())。但是,我需要测试它的类型。现在它使一切都成为一个.png,这显然不适用于大多数类型。有什么想法吗?
答案 0 :(得分:2)
首先将图像保存在文件中。 这里有一些代码可以帮助你做到这一点:
public class DownloadImages {
//The url of the website. This is just an example
private static final String webSiteURL = "http://www.supercars.net/gallery/119513/2841/5.html";
//The path of the folder that you want to save the images to
private static final String folderPath = "<FOLDER PATH>";
public static void main(String[] args) {
try {
//Connect to the website and get the html
Document doc = Jsoup.connect(webSiteURL).get();
//Get all elements with img tag ,
Elements img = doc.getElementsByTag("img");
for (Element el : img) {
//for each element get the srs url
String src = el.absUrl("src");
System.out.println("Image Found!");
System.out.println("src attribute is : "+src);
getImages(src);
}
} catch (IOException ex) {
System.err.println("There was an error");
Logger.getLogger(DownloadImages.class.getName()).log(Level.SEVERE, null, ex);
}
}
private static void getImages(String src) throws IOException {
String folder = null;
//Exctract the name of the image from the src attribute
int indexname = src.lastIndexOf("/");
if (indexname == src.length()) {
src = src.substring(1, indexname);
}
indexname = src.lastIndexOf("/");
String name = src.substring(indexname, src.length());
System.out.println(name);
//Open a URL Stream
URL url = new URL(src);
InputStream in = url.openStream();
OutputStream out = new BufferedOutputStream(new FileOutputStream( folderPath+ name));
for (int b; (b = in.read()) != -1;) {
out.write(b);
}
out.close();
in.close();
}
当您将图像保存在磁盘上时,您可以找到他们的扩展名:
String extension = FilenameUtils.getExtension("/path/to/file/image.png");
完成后,也使用Java删除文件。
我不确定如何直接从网址
获取扩展程序