获取网络图片

//根据url获取网络图片并转化为byte数组，方便操作

public  byte[] getBytesByURL(String imageUrl)throws IOException {

       ByteArrayOutputStream bos = new ByteArrayOutputStream();

       BufferedInputStream bis = null;

       HttpURLConnection urlconnection= null;

       URL url = null;

      //创建一个Buffer字符串

       byte[] buf = new byte[1024];

       try {

           url = new URL(imageUrl);

           urlconnection = (HttpURLConnection) url.openConnection();

           urlconnection.connect();

           bis = new BufferedInputStream(urlconnection.getInputStream());

           for (int len = 0; (len = bis.read(buf)) != -1;){

           bos.write(buf,0,len);

           }

       } finally {

           try {

                urlconnection.disconnect();

                bis.close();

           } catch (IOException ignore) {

           }

       }

       return bos.toByteArray();

  }

//根据url返回bufferedImage

public static BufferedImage RequestImage(String imageurl) throws IOException{
   URL url = new URL(imageurl); 
try {
   InputStream inputStream=url.openStream();
BufferedImage  bufferedImage=ImageIO.read(inputStream);
return bufferedImage;
} catch (IOException e) {
e.printStackTrace();
return null;
}
  }