Java读写txt文件

平时经常需要跑一些本地数据进行测试，对Java的文件操作比较陌生，这里记录下来供后边查询学习

读取txt文件

   public static void main(String[] args) throws IOException {
       String pathname = "C:\\Users\\likanghai\\Desktop\\rank.txt";
       File file = new File(pathname);
       
       InputStreamReader input = new InputStreamReader(new FileInputStream(file));
       
       BufferedReader bufferedReader = new BufferedReader(input);

       String line = null;
       line = bufferedReader.readLine();
       
       while (line != null) {
           System.out.println(line);
           line = bufferedReader.readLine();
       }
   }

写入txt文件

  public static void main(String[] args) throws IOException {
       File file = new File("C:\\Users\\likanghai\\Desktop\\rank.txt");
       
       if(!file.exists() && file.createNewFile()){
           throw new IOException();
       }
       
       BufferedWriter out = new BufferedWriter(new FileWriter(file));
       out.flush();
       String text = "写入数据\n";
       out.write(text);
       out.flush();
       out.close();
   }