下载网络图片两种方式

比如因特网上有一图片资源http://img.7799520.com/00356c0e-1725-4dc2-b091-5db958b6c637，现在要把该资源下载到本地，下面介绍如下两种方式。

方式一：

    /*first advice*/
    /*
     * urlHttp = "http://img.7799520.com/00356c0e-1725-4dc2-b091-5db958b6c637"
     * path = "e:/picture"
     * */
    public static void getPicture(String urlHttp, String path){
        String file = path + "/" + new Date().getTime() + ".jpg";
        try {
            URL url = new URL(urlHttp);
            BufferedImage img = ImageIO.read(url);
            ImageIO.write(img, "jpg", new File(file));
        } catch (Exception e) {
            e.printStackTrace();
        } 
    }

运行程序，会在e:/picture下创建一个以当前时间戳命名的jpg格式的照片。

方式二：

    /*second advice*/
    /*
     * urlHttp = "http://img.7799520.com/00356c0e-1725-4dc2-b091-5db958b6c637"
     * path = "e:/picture"
     * */
    public static void getPicture2(String urlHttp, String path){
        FileOutputStream out = null;
        BufferedInputStream in = null;
        HttpURLConnection connection = null;
        byte[] buf = new byte[1024];
        int len = 0;
        try {
            URL url = new URL(urlHttp);
            connection = (HttpURLConnection)url.openConnection();
            connection.connect();
            in = new BufferedInputStream(connection.getInputStream());
            out = new FileOutputStream(path + "/" + new Date().getTime() + ".jpg");
            while ((len = in.read(buf)) != -1) {
                out.write(buf, 0, len);
            }
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
                out.close();
                connection.disconnect();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

运行程序，生成结果同方式一