如何解决：Java文件操作错误：文件写入失败

String filePath = "C:\example\file.txt";
File file = new File(filePath);

if (!file.exists()) {
    // 创建目录
    file.getParentFile().mkdirs();
}

File file = new File("C:\example\file.txt");
try {
    // 获取文件锁
    FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
    FileLock lock = channel.tryLock();

    if (lock != null) {
        // 文件写入操作
        FileWriter writer = new FileWriter(file, true);
        writer.write("Hello, world!");
        writer.close();

        // 释放文件锁
        lock.release();
    } else {
        // 文件被锁定，无法写入
        System.out.println("文件被占用！");
    }

    // 关闭文件通道
    channel.close();
} catch (Exception e) {
    e.printStackTrace();
}

File file = new File("C:\example\file.txt");
File parent = file.getParentFile();
long freeSpace = parent.getFreeSpace();

if (freeSpace < file.length()) {
    // 磁盘空间不足，无法写入文件
    System.out.println("磁盘空间不足！");
}

String filePath = "C:\example\file.txt";
String content = "Hello, 世界!";
Charset charset = Charset.forName("UTF-8");

try (BufferedWriter writer = Files.newBufferedWriter(Paths.get(filePath), charset)) {
    writer.write(content);
} catch (IOException e) {
    e.printStackTrace();
}