common_helper/src/main/java/com/xiongyingqi/util/FileHelper.java
public static URL toURL(File file) {
        if (file == null || !file.exists()) {
            return null;
        }
        URI uri = file.toURI();
        URL url = null;
        try {
            url = uri.toURL();
        } catch (MalformedURLException e) {
            LOGGER.error(e);
        }
        return url;
    }
public static URL toURL(File file) {
        if (file == null || !file.exists()) {
            return null;
        }
        URI uri = file.toURI();
        URL url = null;
        try {
            url = uri.toURL();
        } catch (MalformedURLException e) {
            LOGGER.error(e);
        }
        return url;
    }
将文件转换为URL地址 <br>
2013-9-2 下午10:07:14

@param file
@return