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("圖片轉換BYTE流失敗！");
    }

} catch (IOException e2) {
    if(log.isErrorEnabled()){
        log.error("error:"
 
+e2.getStackTrace()
                +"getMessage:"+e2.getMessage());
    }
    throw new Exception("獲取照片資訊失敗！");
} 

//獲取照片資料流
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]; //建立一個Buffer字串   
       //每次讀取的字串長度，如果為-1，代表全部讀取完畢  
       int len = 0;  
       //使用一個輸入流從buffer裡把資料讀取出來  
       while( (len=inStream.read(buffer)) != -1 ){  
           //用輸出流往buffer裡寫入資料，中間引數代表從哪個位置開始讀，len代表讀取的長度  
           outStream.write(buffer, 0, len);  
       }  
       inStream.close();   //關閉輸入流   
       return outStream.toByteArray();  //把outStream裡的資料寫入記憶體 
}