读取远程图片while(readCount<count){//循环到图片读取完整 readCount+=inStream

/**
 * 网址获取图片base64
 * @param imgUrl
 * @return
 */
public static String getUrlToString(String imgUrl){
    byte[] result=null;
    InputStream inStream=null;
    String photo = "";
    try {
        //创建URL
        URL url=new URL(imgUrl);
        //创建连接
        HttpURLConnection conn=(HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5*1000);
        inStream=conn.getInputStream();
        int count=conn.getContentLength();//获取远程资源长度
        result=new byte[count];
        int readCount=0;
        while(readCount<count){//循环到图片读取完整
            readCount+=inStream.read(result,readCount,count-readCount);
        }
        photo = toBase64(result);
    } catch (Exception e) {
        e.printStackTrace();
        logger.error("获取远程图片失败", e);
    } finally {
        try {
            if (inStream != null) {
                inStream.close();
            }
        } catch (IOException e) {
            logger.error("文件处理错误!",e);
        }
        logger.info("o==||=====>读取图片返回");
    }
    return photo;
}

private static String toBase64(byte[] imgData) {
    BASE64Encoder encoder = new BASE64Encoder();
    return encoder.encode(imgData);
}