文件读写

 public static void main(String[] args) throws IOException {
      BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream("d:\2.txt"),"utf-8"));
      BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\3.txt"),"utf-8"));
      String str=null;
      while ((str=br.readLine())!=null){
          System.out.println("str:"+str);
          //写入文件
          bw.write(str);
          bw.newLine();
      }
      //清除缓存
      bw.flush();
      //关闭流
      br.close();
      bw.close();
    }