Download picture from URL--java and Python implementation method comparison

Download picture from URL--java and Python implementation method comparison Blog Category:

• A little bit of technical notes

Javapython Picture Download

First, the implementation of Java method

1. First read the picture

Java code

1. Method One: Directly read the picture according to the URL
2. Private static BufferedImage read (String imageUrl) throws IOException {
3. URL url = new URL (IMAGEURL);
4. BufferedImage image = Imageio.read (URL);
5. return image;
6. }

Java code

2. If you need to set some of the properties in connection, such as Requestproperty, then use mode two:
4. Private static BufferedImage read (String imageUrl) throws IOException {
6. URL url = new URL (IMAGEURL);
10. HttpURLConnection conn = (httpurlconnection) url.openconnection ();
12. //conn.setrequestproperty ("Referer", Referer);
14. Conn.setrequestmethod ("GET");
16. BufferedImage image = Imageio.read (Conn.getinputstream ());
18. return image;
22. }

2. Then save the picture

Java code

2. Private static void Save (bufferedimage image, String destimageurl)
4. throws IOException {
6. File ImageFile = new File (Destimageurl);
8. FileOutputStream OutStream = new FileOutputStream (ImageFile);
12. Imageio.write (image, "jpg", outstream);
14. Imageio.write (image, "gif", OutStream);
16. Imageio.write (image, "png", OutStream);
18. Imageio.write (image, "JPEG", outstream);
20. }

3. How to get the type of picture (jpg, Jpeg, GIF, PNG, etc.)

Java code

2. Public static String get (byte[] imagebt) throws IOException {
4. String type = "";
6. Memorycacheimageinputstream MCIS = null;
8. try {
10. MCIS = New Memorycacheimageinputstream (new Bytearrayinputstream (
12. IMAGEBT));
14. Iterator<imagereader> it = imageio.getimagereaders (MCIS);
16. While (It.hasnext ()) {
18. ImageReader reader = (imagereader) it.next ();
20. return Reader.getformatname ();
22. }
24. } finally {
26. if (MCIS! = null) {
28. try {
30. Mcis.close ();
32. } catch (IOException IoE) {
34. }
36. }
38. }
40. return type;
42. }

Ii. how Python is implemented

1. One line of code for picture reading and saving

Python code

1. From Urllib import Urlretrieve
2. Urlretrieve (' http://img.chetx.com/chetxbbs/2005_04/09/1113039370066.gif ', ' e://mypicture.gif ')

2. One line of code to get the picture type

Python code

1. Import IMGHDR
2. Imghdr.what (' MyPicture.gif ')

Iii. Summary

Compared to the implementation of Java,python is really too concise and clear

Download picture from URL--java and Python implementation method comparison