Java IO读写文件

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读文件

	/**
	 * 从文件读数据
	 */
	public void testRead() throws IOException {

		String filename = "D://aaa.txt";
		File file = new File(filename);

		FileReader fr = new FileReader(file);
		
		BufferedReader br = new BufferedReader(fr);

		String s = null ;

		while ( (s=br.readLine()) != null) {
			System.out.println(s);
		}

		br.close();
		fr.close();
	}

写文件

/**
	 * 往文件写数据
	 */
	public void testWrite() throws IOException {

		String filename = "D://aaa.txt";
		File file = new File(filename);

		try {

			FileWriter fw = new FileWriter(file);

			BufferedWriter bw=new BufferedWriter(fw);
			PrintWriter out = new PrintWriter(fw);
			
			out.append("ssss");
			out.append("\r\n");
			out.append("ddddd");
//			out.flush(); 

			out.close();
			fw.close();

		} catch (IOException e) {
			System.out.println("Uh oh, got an IOException error!");
			e.printStackTrace();
		}
	}