String filePath = "http://127.0.0.1/doc/pic.jpg";

byte[] byteArray;
HttpURLConnection connection = null;
if(StringUtils.isEmptyString(filePath)){
    return;
}
try {
    URL url = new URL(filePath);
    connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("GET");
    connection.setConnectTimeout(5*1000);
    InputStream in = connection.getInputStream();
    try {
        byteArray = readInputStream(in);
    } catch (Exception e) {
        log.error("error:"+e.getStackTrace());
        throw new Exception("图片转换BYTE流失败！");
    }

} catch (IOException e2) {
    if(log.isErrorEnabled()){
        log.error("error:"+e2.getStackTrace()
                +"getMessage:"+e2.getMessage());
    }
    throw new Exception("获取照片信息失败！");
} 

//获取照片数据流
if(byteArray != null){
    datamodel.setModelChangeImageObject("Picture",byteArray);
}   
connection.disconnect();
}

private static byte[] readInputStream(InputStream inStream) throws Exception{  
       ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
       byte[] buffer = new byte[1024]; //创建一个Buffer字符串 
       //每次读取的字符串长度，如果为-1，代表全部读取完毕 
       int len = 0;  
       //使用一个输入流从buffer里把数据读取出来 
       while( (len=inStream.read(buffer)) != -1 ){  
           //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度 
           outStream.write(buffer, 0, len);  
       }  
       inStream.close();   //关闭输入流 
       return outStream.toByteArray();  //把outStream里的数据写入内存 
}