public static void main(String args[]) throws Exception
	{
		File file  = new File("F:"+File.separator+"work"+File.separator+"work"+File.separator+"demo.txt");
		String str = args[0];
		if(str.equals("w"))
		{
			write(file);
		}else if(str.equals("r"))
		{
			read(file);
		}else{
			System.out.println("您没有传递任何参数");
		}
	}
	
	public static void write(File file) throws Exception
	{
		//字符输出
		Writer out = null;
		out = new FileWriter(file,true);
		String str = "你好啊盆友\r\n";
		out.write(str);
		out.close();
		
	}
	
	public static void read(File file) throws Exception
	{
		//字符输入流
		Reader input = null;
		//通过子类直接实例化操作
		input = new FileReader(file);
		//开辟空间接收读取的内容
		char b[] = new char[(int) file.length()];
		for(int i = 0; i < b.length; i++)
		{
			//一个一个的读取数据
			b[i] = (char) input.read();
		}
		//输出内容，之间转换
		System.out.println(new String(b));
		input.close();
	}