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 
        }