从url下载图片--java与python实现方式比较

从url下载图片--java与python实现方式比较

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• 技术笔记小点滴

javapython图片下载 

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;

}

   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

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’)

    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