文件的复制通过字节流、转换流、缓冲流

public class CopyBufferedReaderAndWriter {

    public static void main(String[] args) {
      try {
        FileInputStream fileInputStream = new FileInputStream("learn.txt");
        InputStreamReader isr = new InputStreamReader(fileInputStream);
        
        FileOutputStream fileOutputStream = new FileOutputStream("kid22.txt");
        OutputStreamWriter osw = new OutputStreamWriter(fileOutputStream);
        
        BufferedReader brBufferedReader = new BufferedReader(isr);
        BufferedWriter bufferedWriter = new BufferedWriter(osw);
        
        String input = null;
        while((input =brBufferedReader.readLine()) != null){
                  bufferedWriter.write(input);
        }
        
         
//      char c [] = new char[1024];
//      int l = 0;
//      while ((l = isr.read(c)) != -1) {
//          osw.write(new String(c,0,l));
//      }
        bufferedWriter.flush();
        
        bufferedWriter.close();
        bufferedWriter.close();
        
        isr.close();
        fileInputStream.close();
        osw.close();
        fileInputStream.close();
      
      
      } catch (Exception e) {
        e.printStackTrace();
    }
    }

}