java如何导入单词

导入单词的方法

在Java中导入单词通常涉及从文件、数据库或用户输入中读取单词数据。以下是几种常见的方法：

从文本文件读取单词

使用BufferedReader或Scanner类从文本文件中逐行读取单词：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadWordsFromFile {
    public static void main(String[] args) {
        String filePath = "words.txt";
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String word;
            while ((word = br.readLine()) != null) {
                System.out.println(word);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用Scanner从用户输入获取单词

通过Scanner类从控制台获取用户输入的单词：

import java.util.Scanner;

public class ReadWordsFromInput {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter words (type 'exit' to stop):");
        String word;
        while (!(word = scanner.next()).equalsIgnoreCase("exit")) {
            System.out.println("Word: " + word);
        }
        scanner.close();
    }
}

从CSV文件导入单词

使用OpenCSV库或其他CSV解析工具读取包含单词的CSV文件：

import com.opencsv.CSVReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadWordsFromCSV {
    public static void main(String[] args) {
        String csvFile = "words.csv";
        try (CSVReader reader = new CSVReader(new FileReader(csvFile))) {
            String[] line;
            while ((line = reader.readNext()) != null) {
                for (String word : line) {
                    System.out.println(word);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

从数据库导入单词

通过JDBC连接数据库并查询单词数据：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class ReadWordsFromDatabase {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/word_db";
        String user = "username";
        String password = "password";
        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT word FROM words")) {
            while (rs.next()) {
                System.out.println(rs.getString("word"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

处理导入的单词

将导入的单词存储在集合中以便后续处理：

import java.util.ArrayList;
import java.util.List;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class StoreWords {
    public static void main(String[] args) {
        List<String> wordList = new ArrayList<>();
        String filePath = "words.txt";
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String word;
            while ((word = br.readLine()) != null) {
                wordList.add(word);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("Imported words: " + wordList);
    }
}