从url下载图片--java与python实现方式比较

q29191

　　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