public static void main(String[] args) {
  File cfile = new File("newnewtest.txt");
  if(cfile.exists()){
   try {
    FileInputStream fis = new FileInputStream(cfile);
    InputStreamReader isr = new InputStreamReader(fis, "gbk");
    BufferedReader br = new BufferedReader(isr);
    String line;
    while((line = br.readLine()) != null){
     System.out.println(line);
    }
    br.close();
    isr.close();
    fis.close();
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
   }catch (IOException e) {
    e.printStackTrace();
   }
  }
  File cfile1 = new File("newnewtest1.txt");
  try {
   FileOutputStream fos = new FileOutputStream(cfile1);
   OutputStreamWriter osw = new OutputStreamWriter(fos, "gbk");
   BufferedWriter bw = new BufferedWriter(osw);
   bw.write("你好！");
   bw.close();
   osw.close();
   fos.close();
  } catch (UnsupportedEncodingException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }catch(Exception e){
   e.printStackTrace();
  }
  
 }