java追加写文件

 File   tofile = new File( "/data/local/1231111.txt");
           
   FileWriter wri = null;
  try {
   wri = new FileWriter(tofile, true);
  } catch (IOException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }
 try {
   wri.write("diqiuzhanshi" + "\r\n");
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
           try {
   wri.close();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }