java 写文本换行

import org.apache.commons.io.FileUtils;
    public static void main(String[] args) throws IOException {
        File file = new File("c:\1\2\3\4.txt");
        FileUtils.writeStringToFile(file, "1:
", false);
        FileUtils.writeStringToFile(file, "2:
", true);
        FileUtils.writeStringToFile(file, "3:
", true);
    }