如何用java保存汉字到文件？

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

public class WriteChineseToFile {
    public static void main(String[] args) {
        String content = "这是一个汉字测试";
        String fileName = "chinese_test.txt";

        try {
            writeToFile(fileName, content);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void writeToFile(String fileName, String content) throws IOException {
        File file = new File(fileName);
        if (!file.exists()) {
            file.createNewFile();
        }

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(file))) {
            writer.write(content);
        }
    }
}