java如何通过一个地址获取一张图片并把图片保存到本地磁盘里面

        URL url = new URL("http://rewalls.com/pic/201112/1920x1200/reWalls.com-57365.jpg");        // 图片不是原来的了。        ImageIO.write(ImageIO.read(url),"jpg",new File("image-01.jpg"));        //        BufferedInputStream input = null;        BufferedOutputStream output = null;        try {            input = new BufferedInputStream(url.openStream());            output = new BufferedOutputStream(new FileOutputStream("/tmp/image-03.jpg"));            for (int d = input.read(); d != -1; d = input.read()) {                output.write(d);            }        } catch (Exception e) {        } finally {            if (input != null) {                input.close();            }            if (output != null) {                output.close();            }        }        // java 7        try (InputStream in = url.openStream()) {                Files.copy(in, Paths.get("/tmp","image-02.jpg"));            } catch (Exception e) {        }