java获取短文件名和扩展名

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/**     * 获取短文件名,不带扩展名     * @param fileName     * @return     */    public static String getShortName(String fileName){    if(fileName != null && fileName.length()>0 && fileName.lastIndexOf(".")>-1){    return fileName.substring(0, fileName.lastIndexOf("."));    }     return fileName;    }        /**     * 获取扩展名,带点     * @param fileName     * @return     */    public static String getExtention(String fileName){    if(fileName!=null && fileName.length()>0 && fileName.lastIndexOf(".")>-1){    return fileName.substring(fileName.lastIndexOf("."));    }    return "";    }        public static void main(String[] args) {    System.out.println(FileUtil.getShortName("aaa.xlsx"));    System.out.println(FileUtil.getShortName("aaa"));    System.out.println(FileUtil.getShortName("."));    System.out.println(FileUtil.getShortName(".xlsx"));        System.out.println(FileUtil.getExtention("aaa.xlsx"));    System.out.println(FileUtil.getExtention("aaa"));    System.out.println(FileUtil.getExtention("."));    System.out.println(FileUtil.getExtention(".xlsx"));    }

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