关于Java中的IO流：流的继承关系、处理流、转换流

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public class MycopyTest {

  public static void main(String[] args) {

    File src = new File("D:/1.jpg");

    // D:/1.jpg必须的存在不然会报错

    File dest = new File("D:/2.jpg");

    // 如果D:/2.jpg存在则覆盖，如果不存在则新建

    streamCopy(src, dest);

  }

private static void readCopy(File src,File dest)

  {

    FileReader fr=null;

    FileWriter fw=null;

    BufferedReader br=null;

    BufferedWriter bw=null;

    try {

      fr=new FileReader(src);

      fw=new FileWriter(dest);

      br=new BufferedReader(fr);

      bw=new BufferedWriter(fw);

      String str;

      while((str=br.readLine())!=null)

      {

        bw.write(str);

        bw.newLine();

      }

    }catch (IOException e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

    try {

      bw.close();

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      br.close();

    } catch (IOException e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

  }

  private static void streamCopy(File src, File dest) {

    FileInputStream fis = null;

    FileOutputStream fos = null;

    BufferedInputStream bis = null;

    BufferedOutputStream bos = null;

    try {

      fis = new FileInputStream(src);

      fos = new FileOutputStream(dest);

      bis = new BufferedInputStream(fis);

      bos = new BufferedOutputStream(fos);

      int len;

      byte[] b = new byte[1024];

      while ((len = bis.read(b)) != -1) {

        bos.write(b, 0, len);

        // bos.write(b,0,len);是把读到数组的大小字节写入

        // bos.write(b);最后一次如果数组未写满的话就会多读。

      }

    } catch (IOException e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

    try {

      bos.close();

      bis.close();

    } catch (Exception e) {

      // TODO Auto-generated catch block

      e.printStackTrace();

    }

  }

}

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public class InputStreamWriterTest {

  public static void main(String[] args) {

    File src = new File("D:/Files/狗屁.txt");

    File dest = new File("D:/Files/斯密斯.txt");

    BufferedWriter bw = null;

    BufferedReader br = null;

    FileInputStream fis = null;

    FileOutputStream fos = null;

    try {

      fis = new FileInputStream(src);

      fos = new FileOutputStream(dest);

      InputStreamReader ir = new InputStreamReader(fis, "GBK");

      OutputStreamWriter ow = new OutputStreamWriter(fos, "GBK");

      bw = new BufferedWriter(ow);

      br = new BufferedReader(ir);

      String str;

      while ((str = br.readLine()) != null) {

        bw.write(str);

        bw.newLine();

        bw.flush();

      }

    } catch (IOException e) {

      e.printStackTrace();

    }

    try {

      bw.close();

      br.close();

    } catch (IOException e) {

      e.printStackTrace();

    }

  }

}