java获取文件里所有图片

		List list = new ArrayList();
		File file = new File("D:/产品图/");
		File[] files = file.listFiles();
		for (int i = 0; i < files.length; i++) {
			File file1 = files[i];
			String fileName = file1.getName();
			String prefix = fileName.substring(fileName.lastIndexOf(".") + 1)
					.toLowerCase();
			if ("jpg".equals(prefix) || "png".equals(prefix)
					|| "bmp".equals(prefix) || "gif".equals(prefix)) {
				list.add(fileName);
			}
		}