将换行符写入文件

要将文本（而不是原始字节）写入文件，应考虑使用FileWriter。您还应该将其包装在BufferedWriter中，这将为您提供newline方法。

要将每个单词写在新行上，请使用String.split将您的文本分成单词数组。

因此，这是对您的要求的简单测试：

public static void main(String[] args) throws Exception {    String nodevalue = "i am mostafa";    // you want to output to file    // BufferedWriter writer = new BufferedWriter(new FileWriter(file3, true));    // but let's print to console while debugging    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));    String[] words = nodevalue.split(" ");    for (String word: words) {        writer.write(word);        writer.newline();    }    writer.close();}

输出为：

iammostafa