Java-IO：复制文件

 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;

 public class CopyFileDemo {
     public static void main(String[] args) {

         FileInputStream fis = null;
         FileOutputStream fos = null;
         try {
             fis = new FileInputStream("js.mp3");
             fos = new FileOutputStream("copy_js.mp3");
             // BufferedInputStream bis=new BufferedInputStream(fis);
             // BufferedOutputStream bos=new BufferedOutputStream(fos);
             byte[] bt = new byte[1024];
             int len = 0;
             while ((len = fis.read(bt)) != -1) {
                 fos.write(bt, 0, len);
             }
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             try {
                 if (fis != null)
                     fis.close();
                 if (fos != null)
                     fos.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }
 }