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();
      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();
    }
  }
}

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();
    }
  }
}