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[操作系统]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2KB18     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 }