Get file name without extension.

Ref:How to get file name without the extension?

Normally,there are two ways to implements this:use the library or the regular expression.

here I use the regular expression.

String s = "a.xml.ac.df.ef";
String result = s.replaceFirst("[.][^.]+$", "");
System.out.println(result);    

  //outputs:a.xml.ac.df

 以上是不考虑到Path, 若有Path,需要先截断路径分隔符,如:

/**获取文件的简短名称,如将"G:\\video_record\\eclipse\\promt-workspace-startup.lxe"转为
	 * "promt-workspace-startup"
	 * @param fileFullName 文件的完整路径.
	 * @return
	 */
	public static String getFileNameWithoutExtention(String fileFullName) {
		//截断路径分隔符.
		int backslash = fileFullName.lastIndexOf("\\") != -1 ? fileFullName.lastIndexOf("\\") : fileFullName.lastIndexOf("/");
		int dot = fileFullName.lastIndexOf(".");
		if (backslash > 0 && dot > 0) {
			fileFullName = fileFullName.substring(backslash + 1, dot);
		}
		return fileFullName;
	}