真的在Java中强制文件同步/刷新

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class FileSync {
    public static void main(String[] args) {
        File file = new File("example.txt");
        try (FileOutputStream fos = new FileOutputStream(file);
             FileChannel channel = fos.getChannel()) {
            channel.force(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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

public class FileSync {
    public static void main(String[] args) {
        File file = new File("example.txt");
        try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
            raf.getChannel().force(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileSync {
    public static void main(String[] args) {
        File file = new File("example.txt");
        try (FileWriter fw = new FileWriter(file);
             BufferedWriter bw = new BufferedWriter(fw)) {
            bw.write("Hello, World!");
            bw.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}