从文件中读取选择行的简单方法

def read_specific_lines(file_path, line_numbers):
    with open(file_path, 'r') as file:
        lines = file.readlines()
        selected_lines = [lines[i-1] for i in line_numbers if 1 <= i <= len(lines)]
    return selected_lines

# 使用示例
file_path = 'example.txt'
line_numbers = [2, 4, 6]
selected_lines = read_specific_lines(file_path, line_numbers)
for line in selected_lines:
    print(line.strip())

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

public class FileLineReader {
    public static List<String> readSpecificLines(String filePath, List<Integer> lineNumbers) throws IOException {
        List<String> selectedLines = new ArrayList<>();
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            int currentLine = 1;
            while ((line = br.readLine()) != null) {
                if (lineNumbers.contains(currentLine)) {
                    selectedLines.add(line);
                }
                currentLine++;
            }
        }
        return selectedLines;
    }

    public static void main(String[] args) {
        try {
            List<Integer> lineNumbers = List.of(2, 4, 6);
            List<String> selectedLines = readSpecificLines("example.txt", lineNumbers);
            for (String line : selectedLines) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

const fs = require('fs');

function readSpecificLines(filePath, lineNumbers) {
    return new Promise((resolve, reject) => {
        const selectedLines = [];
        let currentLine = 1;
        const stream = fs.createReadStream(filePath, { encoding: 'utf8' });
        const rl = require('readline').createInterface({ input: stream });

        rl.on('line', (line) => {
            if (lineNumbers.includes(currentLine)) {
                selectedLines.push(line);
            }
            currentLine++;
        });

        rl.on('close', () => {
            resolve(selectedLines);
        });

        rl.on('error', (err) => {
            reject(err);
        });
    });
}

// 使用示例
const filePath = 'example.txt';
const lineNumbers = [2, 4, 6];
readSpecificLines(filePath, lineNumbers)
    .then(lines => {
        lines.forEach(line => console.log(line));
    })
    .catch(err => console.error(err));