使用ImageIO读取网络图片或本地图片

来自网络

读取网络图片

URL url = new URL(path);
BufferedImage source= ImageIO.read(url);

读取本地图片

BufferedImage source= ImageIO.read(new File(path));

获取网络图片工具类

public class HttpImageUtils {

    private static final Logger logger = LoggerFactory.getLogger(HttpImageUtils.class);
    public static final int TIMEOUT = 5 * 1000;

    /**
     * 获取网络图片转成字节流
     * @param strUrl 完整图片地址
     * @return 图片资源数组
     */
    public static byte[] getNetImgByUrl(String strUrl) {
        try {
            URL url = new URL(strUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(TIMEOUT);
            InputStream inStream = conn.getInputStream();
            return readInputStream(inStream);
        } catch (Exception e) {
            logger.error(e.getMessage(),e);
        }
        return null;
    }

    /**
     * 从输入流中获取字节流数据
     * @param inStream 输入流
     * @return  图片流
     */
    private static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[Integer.MAX_VALUE];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }
}