写一段java代码，读取.txt文件夹种内容，文本内容以逗号或者空格分隔成每个词语，随机出20个词语，要求20个词语不重复，并且一个字的词语不能出现

import java.io.*;
import java.util.*;

public class RandomWords {
    public static void main(String[] args) {
        try {
            // 读取文本文件内容
            File file = new File("words.txt");
            BufferedReader reader = new BufferedReader(new FileReader(file));
            String line;
            List<String> words = new ArrayList<>();
            while ((line = reader.readLine()) != null) {
                String[] tokens = line.split("[,\\s]+");
                for (String token : tokens) {
                    if (token.length() > 1) {
                        words.add(token);
                    }
                }
            }
            reader.close();

            // 随机选择20个不重复的词语
            Set<String> selectedWords = new HashSet<>();
            Random random = new Random();
            while (selectedWords.size() < 20) {
                String word = words.get(random.nextInt(words.size()));
                if (word.length() > 1) {
                    selectedWords.add(word);
                }
            }

            // 输出结果
            System.out.println("随机选择的20个词语：");
            for (String word : selectedWords) {
                System.out.println(word);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}