从url下载图片--java与python实现方式比较
一、java的实现方式[*]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;
}
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;
}
二、python如何实现
[*]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’)
2. 一行代码搞定图片类型获取
import imghdr
imghdr.what(‘mypicture.gif')
三、总结
相比于Java，python的实现真的是太简洁明了了
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