字符缓冲流

1.缓冲流：不具备读写数据的能力，可以提高读取数据的效率，扩展功能，内部维护字符数组                                                                    

                                                                          

 2.BufferedReader：缓冲输入字符流                                              

1. 特殊功能：readLine()     读取一行数据                              

   1.创建通道并指定路径                                                    

    FIleReader reader = new FileReader(“D:\\a.txt”);         

   2.创建缓冲流                                                            

    BufferedReader buffer = new BufferedReader(reader);     

   3.循环读取一行                                                          

    String string = null;                                                  

    while((string = buffer.readLine()) != null){                 

        System.out.println(string);                                        

}                                                                      

   4.关闭流                                                                

    buffer.close();                                                    

                                                                           

3.BufferedWrite：缓冲输出字符流                                            

1.内部提供一个8192长度的字符数组作为缓冲区                           

2.作用：                                                                  

      A）提高写入的效率                                                    

      B）提高FileWrite的功能                                              

 3. 特殊功能：newline();  数据换行显示                                  

  1.创建通道并指定路径                                                     

    FileWrite write = new FIleWrite(“D:\\a.txt”);          

  2.建立缓冲流                                                             

    BuferedWrite buffer = new BufferedWrite(write);           

  3.数据换行显示                                                           

    buffer.newLine();                                       

  4.开始写入数据    //   \r\n也是系统换行                                  

    Buffer.write(“这是要写入的数据”);                                 

  5.关闭资源 （会自动调用flush()）                                         

    bufferedWrite.close();