Java 拷贝文件

import java.io.*;

public class Main {
   public static void main(String[] args) throws Exception {
      BufferedWriter out1 = new BufferedWriter(new FileWriter("srcfile"));
      out1.write("string to be copied\n");
      out1.close();
      InputStream in = new FileInputStream(new File("srcfile"));
      OutputStream out = new FileOutputStream(new File("destnfile"));
      byte[] buf = new byte[1024];
      int len;

      while ((len = in.read(buf)) > 0) {
         out.write(buf, 0, len);
      }
      in.close();
      out.close();
      BufferedReader in1 = new BufferedReader(new FileReader("destnfile"));
      String str;

      while ((str = in1.readLine()) != null) {
         System.out.println(str);
      }
      in.close();
   }
}