Java以UTF-8编码读写文件

java中文件操作体现了设计模式中的装饰者模式 。

以utf-8编码写入文件：

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

以utf-8编码读取文件：

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
  }