Java I/O操作五

用Buffer实现文件的操作

1.读取文件

public static void readOneFile() throws IOException {
		//打开流 FileReader
		Reader in = new FileReader("E://sss.txt");
		BufferedReader fin = new BufferedReader(in);

		// 可以按行读取
		String str1 = null;
		//not including any line-termination characters
		while ( null != (str1=fin.readLine())) {
			System.out.println(str1);
		}

		// 关闭流
		fin.close();
		in.close();
	}

2.写

/**
	 * 展示BufferedWriter的缓存作用
	 * 
	 * @throws IOException
	 */
	public static void showBufferedWriter() throws IOException  {
		StringWriter s = new StringWriter ();
		BufferedWriter out = new BufferedWriter(s, 5);

		// buffer展示
		String str = "1234567890abcde-";
		for (char c: str.toCharArray()) {
			out.write(c);
			System.out.println(s.getBuffer());
		}

		//		out.flush();//强制刷新，把缓存的内容刷新输出
		//		System.out.println(s.getBuffer());

		out.close();//关闭的时候，会自动刷新一次缓存
		System.out.println(s.getBuffer());

		s.close();
	}