字符流高速缓存区文件复制

public static void fileCopy2Buffer(String oldFileName,String newFileName){
        BufferedReader br = null;
        BufferedWriter bw = null;
        try {
            br = new BufferedReader(new FileReader(oldFileName));
            bw = new BufferedWriter(new FileWriter(newFileName));
            String str = null;
            while ((str = br.readLine())!=null){
                bw.write(str);
                bw.newLine();
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                if(bw!=null)br.close();
                if(br!=null)bw.close();
            }catch (Exception ee){
                ee.printStackTrace();
            }
        }
    }