java获取文件最后一行和第一行记录

/ **
     *
     * @description 获取文件最后一行记录
     * @author xiaoxiong
     * @date 2012-10-12
     * @version 1.0.0
     * @param filePath  如："G:/module/billfilesynch/bak/CRBT021201207115068"
     * @return String
     * /
    public static String getFileLastLine(String filePath){
        RandomAccessFile raf;
        String lastLine = "";
        try {
            raf = new RandomAccessFile(filePath, "r");
            long len = raf.length();
            if (len != 0L) {
              long pos = len - 1;
              while (pos > 0) { 
                pos--;
                raf.seek(pos);
                if (raf.readByte() == '\n') {
                  lastLine = raf.readLine();
                  break;
                }
              }
            }
            raf.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return lastLine;
    }
    / **
     *
     * @description 获取文件第一行记录
     * @author xiaoxiong
     * @date 2012-10-12
     * @version 1.0.0
     * @param filePath
     * @return String
     * /
    public static String getFileFirstLine(String filePath){
        RandomAccessFile raf;
        String firstLine = "";
        try {
            raf = new RandomAccessFile(filePath, "r");
            firstLine=raf.readLine();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return firstLine;
    }