java 按行读取文件并输出到控制台 java 按行读取文件并输出到控制台的方法

public static void main(String[] args) throws IOException {
    /*
     * 1.打开一个file
     * 2.new一个InputStreamReader←FileInputStream←file
     * 3.用BufferedReader（←InputStreamReader）的readLine()方法读取
     * */
    File ctoFile = new File("C://Users//gl//Desktop//ku//51cto.txt");
    InputStreamReader rdCto = new InputStreamReader(new FileInputStream(ctoFile));
    BufferedReader bfReader = new BufferedReader(rdCto);
    String txtline = null;
    while ((txtline = bfReader.readLine()) != null) {
      System.out.println(txtline);
    }
    bfReader.close();
  };