java读写.txt文件

public static void main(String[] args) throws InterruptedException, FileNotFoundException {
        File file = new File("C:\Users\ynadmin\Desktop\test.txt");
        File file1 = new File("C:\Users\ynadmin\Desktop\test1.txt");
        BufferedReader reader = null;
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file1), StandardCharsets.UTF_8));
        StringBuilder sbf = new StringBuilder();
        try {
            reader = new BufferedReader(new FileReader(file));
            String tempStr;
            while ((tempStr = reader.readLine()) != null) {
                sbf.append(tempStr);
                bw.write(tempStr+",");  // 将数据写入文件中
                bw.newline();        // 新建一个换行符
                bw.flush();
            }
            reader.close();
            bw.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }