小记：加载网络图片返回字节数组。

 1 import java.io.BufferedInputStream;
 2 import java.io.ByteArrayOutputStream;
 3 import java.io.InputStream;
 4 import java.net.HttpURLConnection;
 5 import java.net.URL;
 6 
 7 public class ReadURLUtil {
 8 
 9     public static byte[] loadRawDataFromURL(String u) throws Exception {
10         URL url = new URL(u);
11         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
12 
13         InputStream is = conn.getInputStream();
14         BufferedInputStream bis = new BufferedInputStream(is);
15 
16         ByteArrayOutputStream baos = new ByteArrayOutputStream();
17         // 缓存2KB
18         final int BUFFER_SIZE = 2 * 1024;
19         final int EOF = -1;
20 
21         int c;
22         byte[] buf = new byte[BUFFER_SIZE];
23 
24         while (true) {
25             c = bis.read(buf);
26             if (c == EOF)
27                 break;
28 
29             baos.write(buf, 0, c);
30         }
31 
32         conn.disconnect();
33         is.close();
34 
35         byte[] data = baos.toByteArray();
36         baos.flush();
37 
38         return data;
39     }
40 
41 }