Java以UTF-8编码读写文件

FileOutputStream fos = new FileOutputStream("test.txt");   
       OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");   
       osw.write(FileContent);   
       osw.flush();   

FileInputStream fis = new FileInputStream("test.txt");   
  InputStreamReader isr = new InputStreamReader(fis, "UTF-8");   
  BufferedReader br = new BufferedReader(isr);   
  String line = null;   
  while ((line = br.readLine()) != null) {   
      FileContent += line;   
      FileContent += "\r\n"; // 补上换行符   
  }