java - 删除JAVA中文件传递的停用词

Question

我必须从 txt 文件中获取一些停用词并将其从文本中删除。我使用此方法从文件中获取停用词，将它们保存在字符串数组中并返回:

public String[] loadStopwords(File targetFile, String[] stopWords) throws IOException {

    File fileTo = new File(targetFile.toString());
    BufferedReader br;
    List<String> lines = new ArrayList<String>();

    try {
            br = new BufferedReader(new FileReader(fileTo));
            String st;
                while((st=br.readLine()) != null){
                    lines.add(st);
                }
    } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    stopWords = lines.toArray(new String[]{});
    return stopWords;

}

然后，我传递 StopWords[] 和要在其中更新的文本:

public void removeStopWords(String targetText, String[] stopwords) {
    targetText = targetText.toLowerCase().trim();

    ArrayList<String> wordList = new ArrayList<>();
    wordList.addAll(Arrays.asList(targetText.split(" ")));

    List<String> stopWordsList = new ArrayList<>();
    stopWordsList.addAll(Arrays.asList(stopwords));

    wordList.removeAll(stopWordsList);

}

但是 wordList 中没有删除任何内容。为什么？

Answer 1

尝试将停用词也保存为小写:

public  String[] loadStopwords(String targetFile) throws IOException {
    File fileTo = new File(targetFile);
    BufferedReader br;
    List<String> lines = new ArrayList<>();
    try {
        br = new BufferedReader(new FileReader(fileTo));
        String st;
        while((st=br.readLine()) != null){
            //Adding words en lowercase and without start end blanks
            lines.add(st.toLowerCase().trim);
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    return lines.toArray(new String[]{});
}

public  ArrayList<String> removeStopWords(String targetText, String[] stopwords) {
    //Make the text to LowerCase also
    targetText = targetText.toLowerCase().trim();

    ArrayList<String> wordList = new ArrayList<>();
    wordList.addAll(Arrays.asList(targetText.split(" ")));

    List<String> stopWordsList = new ArrayList<>();
    stopWordsList.addAll(Arrays.asList(stopwords));

    wordList.removeAll(stopWordsList);

    return wordList;
}