Import? Java . io . file not found exception； ?

Import? Java . io . io exception； ?

Import? Java . io . random access file； ?

/**?

*? Start reading from the last line?

*/?

Public? Class? FromEndRF？ {?

/**?

*?

*? @param？ File name? Target file?

*? @param？ Character set? What is the encoding format of the target file?

*/?

Public? Static electricity Invalid? Read (string? File name? String? Character set)? {?

RandomAccessFile？ rf？ =? null？

Try it? {?

rf？ =? New? RandomAccessFile (file name, "r"); ?

Dragon? Ryan. =? rf.length()。 ?

Dragon? Start? =? RF . getfile pointer()； ?

Dragon? nextend？ =? Start? +? Ryan. -? 1; ?

String? Line; ?

RF . seek(next end)； ?

int？ c？ =? - 1; ?

What time? (nextend？ & gt？ Start)? {?

c？ =? RF . read()； ?

What if? (c？ ==? \n '？ ||? c？ ==? \r ')？ {?

Line? =? RF . readline()； ?

What if? (line? ! =? null)？ {?

System.out.println (new? String (line?

. getBytes("ISO-8859- 1 ")，？ charset))； ?

}? Or what? {?

system . out . println(line)； ?

}?

next end-； ?

}?

next end-； ?

RF . seek(next end)； ?

What if? (nextend？ ==? 0)? {//? When the file pointer returns to the beginning of the file, the first line is output.

//? system . out . println(RF . readline())； ?

System.out.println (new? String(rf.readLine()。 getBytes(？

" ISO-8859- 1 ")，？ charset))； ?

}?

}?

}? Catch? (FileNotFoundException？ e)？ {?

e . printstacktrace()； ?

}? Catch? (IOException？ e)？ {?

e . printstacktrace()； ?

}? Finally? {?

Try it? {?

What if? (rf？ ! =? null)？

RF . close()； ?

}? Catch? (IOException？ e)？ {?

e . printstacktrace()； ?

}?

}?

}?

Public? Static electricity Invalid? Main (string? args[])？ {?

read("mynewfile.txt "，“UTF-8”)； ?

}?

Description: The above is a case of reading a document backwards. You can design your own code according to this case and your actual needs. In addition, if it is a web application or other persistent application, you can try to keep the file open by using a separate thread or storing the read location in memory.