public static void main(String[] args) throws IOException {

    io();

    buffer();

}

/**

 * 以流的形式读写 可以使用任何文件 特别是二进制文件

 *

 * @author hh

 * @date 2014-12-11

 * @throws IOException

 */

    public static  void  io() throws IOException {

        String fname = "C:/Users/Administrator/Desktop/T.jar";

        String fname2 = "C:/Users/Administrator/Desktop/T2.rar";

        File file = new File(fname);

        File file2 = new File(fname2);

        FileInputStream in = new FileInputStream(file);

        FileOutputStream out = new FileOutputStream(file2);

        byte[] bytes= new byte[2048];

        int k = 0;

        while((k=in.read(bytes))!=-1){

            out.write(bytes);

            /*for (int i = 0; i < bytes.length; i++) {//这样效率很低

                out.write(bytes[i]);

            }*/

        }

        /*或者

         * int b  = 0 ;

        while((b=in.read())!=-1) {

                out .write(b);

        } */

        out.close();

        in.close();

        System.out.println("end");

    }

    /**

     * 以字符的形式读写 实用文文本文件

     * 不适用与压缩等二进制文件  否者写出来的文件会比源文件大

     * @author hh

     * @date 2014-12-11

     * @throws IOException

     */

  public static void buffer()  throws IOException {

        String fname = "C:/Users/Administrator/Desktop/1234.txt";

        String fname2 = "C:/Users/Administrator/Desktop/kk.txt";

        File file = new File(fname);

        InputStreamReader read = new InputStreamReader(new FileInputStream(file),"GBK");//解决中文乱码

        //FileReader read =  new FileReader(file);  也可以直接使用FileReader 但是会出想中文乱码

        FileWriter fw = new FileWriter(fname2);

        BufferedReader bufferedReader = new BufferedReader(read);

        BufferedWriter b = new BufferedWriter(fw);

        String s =null;

        while ((s = bufferedReader.readLine()) !=null) {

            System.out.println(s);

                b.write(s);

                b.newLine();//换行

                b.flush();

        }

        b.close();

        read.close();

        fw.close();

        System.out.println("---end");

  }