/**     * @Description 下载网络图片资源     * @param imageUrl 图片地址     * @return String 下载后的地址     * @author SUNBIN     * @date 2017年8月29日     */    public String downloadImageByUrl(String imageUrl){        String path = "";        try {            //读取图片资源地址            URL url = new URL(imageUrl);            //创建url链接            HttpURLConnection conn = (HttpURLConnection)url.openConnection();            conn.setRequestMethod("GET");            conn.setConnectTimeout(5 * 1000);            //通过输入流获取图片数据            InputStream inStream = conn.getInputStream();                        //得到图片的二进制数据            ByteArrayOutputStream outStream = new ByteArrayOutputStream();            byte[] buffer = new byte[1024];            int len = 0;            while((len=inStream.read(buffer)) != -1 ){                outStream.write(buffer, 0, len);            }            inStream.close();            byte[] btImg = outStream.toByteArray();                        //如果图片的二进制数据不为空，写入hdfs            if(null != btImg && btImg.length > 0){                System.out.println("读取到：" + btImg.length + " 字节");                String fileName = "百度.gif";                                File file = new File("F:\\image\\" + fileName);                FileOutputStream fops = new FileOutputStream(file);                fops.write(btImg);                fops.flush();                fops.close();                System.out.println("图片已经写入到磁盘");                            }else{                System.out.println("没有从该连接获得内容");            }                    } catch (Exception e) {            e.printStackTrace();        }        return path;    }