从url下载图片--java与python实现方式比较_JAVA_编程开发_程序员俱乐部

一、java的实现方式

1. 首先读取图片

//方式一：直接根据url读取图片
private static BufferedImage read(String imageUrl) throws IOException {
		URL url = new URL(imageUrl);
		BufferedImage image = ImageIO.read(url);
		return image;
	}

//如果需要设置connection里的一些属性，譬如RequestProperty，则采用方式二：
private static BufferedImage read(String imageUrl) throws IOException {
		URL url = new URL(imageUrl);

		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		//conn.setRequestProperty("Referer", referer);
		conn.setRequestMethod("GET");
		BufferedImage image = ImageIO.read(conn.getInputStream());
		return image;

}

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?? 2. 然后保存图片

private static void save(BufferedImage image, String destImageUrl)
			throws IOException {
		File imageFile = new File(destImageUrl);
		FileOutputStream outStream = new FileOutputStream(imageFile);

		ImageIO.write(image, "jpg", outStream);
ImageIO.write(image, "gif", outStream);
ImageIO.write(image, "png", outStream);
ImageIO.write(image, "jpeg", outStream);
}

??3. 如何获取图片的类型（jpg、Jpeg、gif、png等）

public static String get(byte[] imageBT) throws IOException {
		String type = "";
		MemoryCacheImageInputStream mcis = null;
		try {
			mcis = new MemoryCacheImageInputStream(new ByteArrayInputStream(
					imageBT));
			Iterator<ImageReader> it = ImageIO.getImageReaders(mcis);
			while (it.hasNext()) {
				ImageReader reader = (ImageReader) it.next();
				return reader.getFormatName();
			}
		} finally {
			if (mcis != null) {
				try {
					mcis.close();
				} catch (IOException ioe) {
				}
			}
		}
		return type;
	}

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二、python如何实现

1. 一行代码搞定图片读取和保存

from urllib import urlretrieve
urlretrieve(‘http://img.chetx.com/chetxbbs/2005_04/09/1113039370066.gif’, ‘e://mypicture.gif’)

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??? 2. 一行代码搞定图片类型获取

import imghdr
imghdr.what(‘mypicture.gif')

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三、总结

??? 相比于Java，python的实现真的是太简洁明了了