extracting phrases from text file in java [closed]

问题:

i'm doing project on host based intrusion detection using ADFA-LD dataset ,now i'm doing feature extraction module. i constructed the phrase dictionary which consists of system call phrases of length 4. And now for feature extraction ,i need to compare the phrases with the new system call traces (following are some samples):

sys_clock_gettime sys_poll sys_poll sys_clock_gettime sys_poll sys_poll sys_poll sys_clock_gettime sys_poll sys_clock_gettime sys_poll sys_poll sys_poll sys_poll sys_poll sys_poll sys_poll sys_poll sys_socketcall.......

What i need is, how can i compare these phrases with the new traces. i'm doing in java.

my phrase dictionary:

sys_socketcall-sys_poll-sys_clock_gettime-sys_poll

sys_clock_gettime-sys_poll-sys_poll-sys_socketcall

sys_poll-sys_socketcall-sys_poll-sys_clock_gettime

sys_poll-sys_clock_gettime-sys_clock_gettime-sys_clock_gettime

sys_clock_gettime-sys_clock_gettime-sys_socketcall-sys_clock_gettime

sys_socketcall-sys_clock_gettime-sys_poll-sys_poll

sys_poll-sys_poll

i'm using '-' as separator on comparing these phrases with the new traces, so i joined unique system calls with '-'.

回答1:

It seems like your desired words are divided by space. In that case just read your file line by line, and then get your words using String.split(" "). Here is the one i might think of:

public class FileSplitter {      public static void main(String[] args) throws IOException {         File file = new File("input_file.txt");         LinkedList<String> words = new LinkedList<String>();         int i = 0;          Files.lines(file.toPath()).         forEachOrdered(line -> words.                 addAll(Arrays.asList(line.split(" "))));          for(String word:words){             if(word.trim().length() > 0){                 System.out.print(word.trim() + " ");                 if(i++ >= 3){                     System.out.println();                     i = 0;                 }             }         }     } } 

For your example it returns this:

sys_clock_gettime sys_poll sys_poll sys_clock_gettime  sys_poll sys_poll sys_poll sys_clock_gettime  sys_poll sys_clock_gettime sys_poll sys_poll  sys_poll sys_poll sys_poll sys_poll sys_poll sys_poll sys_socketcall  

文章来源: extracting phrases from text file in java [closed]