java获取url后缀,以及判断是否带参数(?params=xxx)

java获取url后缀,以及判断是否带参数(?params=xxx)

	// 使用了String对象的方法截取字符串String fileUrl = "http://www.baidu.com?a=1234";int index = fileUrl.lastIndexOf("?");if (index != -1) {
    fileUrl = fileUrl.substring(0, index);}String extension = FilenameUtils.getExtension(fileUrl);System.out.println(extension);

	# getExtension 方法public static String getExtension(String filename) {
    if (filename == null) {
    return null;} else {
    int index = indexOfExtension(filename);return index == -1 ? "" : filename.substring(index + 1);}}