JavaArithmetic/src/datastructure/map/FileOperation.java at master · sqlcyi2008/JavaArithmetic · GitHub

Repository navigation

History

package datastructure.map;

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Locale;

import java.util.Scanner;

// 文件相关操作

public class FileOperation {

// 读取文件名称为filename中的内容，并将其中包含的所有词语放进words中

public static boolean readFile(String filename, ArrayList<String> words){

if (filename == null || words == null){

System.out.println("filename is null or words is null");

return false;

}

// 文件读取

Scanner scanner;

try {

File file = new File(filename);

if(file.exists()){

FileInputStream fis = new FileInputStream(file);

scanner = new Scanner(new BufferedInputStream(fis), "UTF-8");

scanner.useLocale(Locale.ENGLISH);

}

else

return false;

}

catch(IOException ioe){

System.out.println("Cannot open " + filename);

return false;

}

// 简单分词

// 这个分词方式相对简陋, 没有考虑很多文本处理中的特殊问题

// 在这里只做demo展示用

if (scanner.hasNextLine()) {

String contents = scanner.useDelimiter("\\A").next();

int start = firstCharacterIndex(contents, 0);

for (int i = start + 1; i <= contents.length(); )

if (i == contents.length() || !Character.isLetter(contents.charAt(i))) {

String word = contents.substring(start, i).toLowerCase();

words.add(word);

start = firstCharacterIndex(contents, i);

i = start + 1;

} else

i++;

}

return true;

}

// 寻找字符串s中，从start的位置开始的第一个字母字符的位置

private static int firstCharacterIndex(String s, int start){

for( int i = start ; i < s.length() ; i ++ )

if( Character.isLetter(s.charAt(i)) )

return i;

return s.length();

}

JavaArithmetic/src/datastructure/map/FileOperation.java at master · sqlcyi2008/JavaArithmetic · GitHub

Repository navigation

Expand file tree

Breadcrumbs

FileOperation.java

Latest commit

History

Breadcrumbs

FileOperation.java

File metadata and controls