java文件读写操作

 public static void main(String[] args) throws Exception{
        //缓冲读取
        String pathname= "e:\\a.txt";
        String targetName = "e:\\b.txt";
        //可以设置字符编码（防止中文乱码）
      //****************************************************************************************************************
        //一、使用缓冲进行文件的读取（字符流）
      /*  BufferedReader bReader =new BufferedReader(new InputStreamReader(new FileInputStream(new File(pathname)), "GBK"));
        //BufferedReader bReader = new BufferedReader(new FileReader(new File(pathname))); //不可设置字符编码
        BufferedWriter bWriter =new BufferedWriter(new FileWriter(new File(targetName)));
        String str="";
        while((str=bReader.readLine())!=null){
            bWriter.write(str);
            bWriter.newLine(); //换行操作
        }
        bWriter.flush();
        bWriter.close();
        bReader.close();*/
       //****************************************************************************************************************
       /* //二、使用流的形式进行文件的读写操作(字节流)
        FileInputStream fileInputStream = new FileInputStream(new File(pathname));
        FileOutputStream fileOutputStream =new FileOutputStream(new File(targetName));
        byte[]b =new byte[2014];
        while(fileInputStream.read(b)!=-1){
            fileOutputStream.write(b);
        }
        fileOutputStream.flush();
        fileOutputStream.close();
        fileInputStream.close();*/
        //*********************************************************************************************
        //文件扫描 
        /*FileInputStream inputStream =new FileInputStream(pathname);
        Scanner scanner =new Scanner(inputStream, "GBK");
        while(scanner.hasNext()){
            System.out.println(scanner.next());
        }*/
        //四、*********************************************************************************************
        LineIterator iterator = FileUtils.lineIterator(new File(pathname), "GBK"); //可修改字符编码 
        while(iterator.hasNext()){
            System.err.println(iterator.next());
        }
    }