小记：加载网络图片返回字节数组。

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class ReadURLUtil {

    public static byte[] loadRawDataFromURL(String u) throws Exception {
        URL url = new URL(u);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        InputStream is = conn.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(is);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 缓存2KB
        final int BUFFER_SIZE = 2 * 1024;
        final int EOF = -1;

        int c;
        byte[] buf = new byte[BUFFER_SIZE];

        while (true) {
            c = bis.read(buf);
            if (c == EOF)
                break;

            baos.write(buf, 0, c);
        }

        conn.disconnect();
        is.close();

        byte[] data = baos.toByteArray();
        baos.flush();

        return data;
    }

}