读取非随机存取文件中特定行的有效方法- Java

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

public class ReadSpecificLine {
    public static void main(String[] args) {
        String filePath = "path/to/file.txt";
        int lineNumber = 5; // 读取第5行的内容

        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            int currentLine = 1;

            while ((line = br.readLine()) != null) {
                if (currentLine == lineNumber) {
                    System.out.println(line);
                    break;
                }
                currentLine++;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.IOException;
import java.io.RandomAccessFile;

public class ReadSpecificLine {
    public static void main(String[] args) {
        String filePath = "path/to/file.txt";
        int lineNumber = 5; // 读取第5行的内容

        try (RandomAccessFile file = new RandomAccessFile(filePath, "r")) {
            String line;
            long position = 0;
            int currentLine = 1;

            while ((line = file.readLine()) != null) {
                if (currentLine == lineNumber) {
                    System.out.println(line);
                    break;
                }
                position = file.getFilePointer();
                currentLine++;
            }

            file.seek(position); // 将文件指针设置回原来的位置
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}