从文件读入字符串，但是一行上空格后的所有文本都被删除了？

Question

我有一个带有如下短语的大文本文件：

citybred JJ 
Brestowe NNP 
STARS NNP NNS
negative JJ NN
investors NNS NNPS
mountain NN 

我的目标是保留每行的第一个单词，不带空格，并使其小写。 EX：

citybred 
brestowe
stars
negative
investors
mountain

如果上述文字经过评估，将返回。

有什么帮助吗？

当前代码：

public class FileLinkList
{
    public static void main(String args[])throws IOException{
        String content = new String();
        File file = new File("abc.txt");
        LinkedList<String> list = new LinkedList<String>();

        try {
            Scanner sc = new Scanner(new FileInputStream(file));
            while (sc.hasNextLine()){
                content = sc.nextLine();
                list.add(content);
            }
            sc.close();
        } catch(FileNotFoundException fnf){
            fnf.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("\nProgram terminated Safely...");
        }

        Collections.reverse(list);
        Iterator i = list.iterator();
        while (i.hasNext()) {
            System.out.print("Node " + (count++) + " : ");
            System.out.println(i.next());
        }
    }
}

Answer 1

如果您的令牌及其POS标签用空格隔开：

public class FileLinkList{

    public static void main(String[] args) {

        BufferedReader br = null;
            LinkedList<String> list = new LinkedList<String>();
            String word;
        try {
            String sCurrentLine;
            br = new BufferedReader(new FileReader("LEXICON.txt"));
            while ((sCurrentLine = br.readLine()) != null) {
                System.out.println(sCurrentLine);
                            word = sCurrentLine.trim().split(" ")[0];
                            list.add(word.toLowerCase());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)
                                br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

Answer 2

添加以下内容：

content = sc.nextLine();
string[] tokens = content.split(new char[] {' '}, StringSplitOptions.RemovEemptyEntries);
// You can add some validations here...
string word = tokens[0].ToLowerCase();

Answer 3

尝试这个 ：

public class FileLinkList {
    public static void main(String args[])throws IOException{
        String content = new String();
        int count=1;
        File file = new File("abc.txt");
        LinkedList<String> list = new LinkedList<String>();

        try {
            Scanner sc = new Scanner(new FileInputStream(file));
            while (sc.hasNextLine()){
                content = sc.nextLine();
                if (content != null && content.length() > 0)) {
                    list.add(content.trim().split(" ")[0].toLowerCase());
                }
            }
            sc.close();
        } catch(FileNotFoundException fnf){
            fnf.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("\nProgram terminated Safely...");
        }

        for (String listItem : list) {
            System.out.println(listItem);
        }
    }
}

Answer 4

使用Apache Commons IO ，将文件读入字符串列表要简单得多。

import org.apache.commons.io.FileUtils;

List<String> lines = FileUtils.readLines(new File("abc.txt"));
List<String firstWords = new ArrayList<>();
for (String line : lines) {
  String firstWord = line.split(" ")[0].toLowerCase();
  firstWords.add(firstWord);
}