如何从Java的任何网页下载图像
嗨，我想从网页下载图像。 我正试图从“http://www.yahoo.com”主页下载图像。 请告诉我如何通过'http://www.yahoo.com'作为input。 并打开此网页如何从此页面获取图像。 请给我java代码从网页上获取图像。
(throws IOException) Image image = null; try { URL url = new URL("http://www.yahoo.com/image_to_read.jpg"); image = ImageIO.read(url); } catch (IOException e) { } 有关更多信息，请参阅javax.imageio包。 这是使用AWT图像。 否则，你可以这样做：
URL url = new URL("http://www.yahoo.com/image_to_read.jpg"); InputStream in = new BufferedInputStream(url.openStream()); ByteArrayOutputStream out = new ByteArrayOutputStream(); byte[] buf = new byte[1024]; int n = 0; while (-1!=(n=in.read(buf))) { out.write(buf, 0, n); } out.close(); in.close(); byte[] response = out.toByteArray();
然后你可能想要保存图像，所以：
FileOutputStream fos = new FileOutputStream("C://borrowed_image.jpg"); fos.write(response); fos.close();
如果你想保存图像，并知道它的URL，你可以这样做：
try(InputStream in = new URL("http://example.com/image.jpg").openStream()){ Files.copy(in, Paths.get("C:/File/To/Save/To/image.jpg")); }
您还需要处理可能抛出的IOException 。
它适用于我）
URL url = new URL("http://upload.wikimedia.org/wikipedia/commons/9/9c/Image-Porkeri_001.jpg"); InputStream in = new BufferedInputStream(url.openStream()); OutputStream out = new BufferedOutputStream(new FileOutputStream("Image-Porkeri_001.jpg")); for ( int i; (i = in.read()) != -1; ) { out.write(i); } in.close(); out.close();
您正在寻找一个networking爬虫。 你可以使用JSoup来做到这一点， 这里是基本的例子
以下代码将直接链接到磁盘的映像下载到项目目录中。 另请注意，它使用try-with-resources 。
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.MalformedURLException; import java.net.URL; import org.apache.commons.io.FilenameUtils; public class ImageDownloader { public static void main(String[] arguments) throws IOException { downloadImage("https://upload.wikimedia.org/wikipedia/commons/7/73/Lion_waiting_in_Namibia.jpg", new File("").getAbsolutePath()); } public static void downloadImage(String sourceUrl, String targetDirectory) throws MalformedURLException, IOException, FileNotFoundException { URL imageUrl = new URL(sourceUrl); try (InputStream imageReader = new BufferedInputStream( imageUrl.openStream()); OutputStream imageWriter = new BufferedOutputStream( new FileOutputStream(targetDirectory + File.separator + FilenameUtils.getName(sourceUrl)));) { int readByte; while ((readByte = imageReader.read()) != -1) { imageWriter.write(readByte); } } } }
// Do you want to download an image? // But are u denied access? // well here is the solution. public static void DownloadImage(String search, String path) { // This will get input data from the server InputStream inputStream = null; // This will read the data from the server; OutputStream outputStream = null; try { // This will open a socket from client to server URL url = new URL(search); // This user agent is for if the server wants real humans to visit String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"; // This socket type will allow to set user_agent URLConnection con = url.openConnection(); // Setting the user agent con.setRequestProperty("User-Agent", USER_AGENT); // Requesting input data from server inputStream = con.getInputStream(); // Open local file writer outputStream = new FileOutputStream(path); // Limiting byte written to file per loop byte[] buffer = new byte[2048]; // Increments file size int length; // Looping until server finishes while ((length = inputStream.read(buffer)) != -1) { // Writing data outputStream.write(buffer, 0, length); } } catch (Exception ex) { Logger.getLogger(WebCrawler.class.getName()).log(Level.SEVERE, null, ex); } // closing used resources // The computer will not be able to use the image // This is a must outputStream.close(); inputStream.close(); }
我想他想把网站的url作为input，而不是图片url。 对于在sitec html代码中以src为url的图片，我认为你可以做prasing和寻找
