java 读写txt文件

java读取txt文件，将数据存入list中

public static List<String> readData(File file) {
		InputStreamReader in = null;
		try {
			in = new InputStreamReader(new FileInputStream(file), "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		BufferedReader br = new BufferedReader(in);
		String string = null;
		ArrayList<String> arrayList = new ArrayList<String>();
		try {
			while ((string = br.readLine()) != null) {
				arrayList.add(string.trim());
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				br.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return arrayList;
	}

　　java 将数据写入 txt文件中

public static String writeDate(String outPath, List<Number> numbers) {
		File writeName = new File(outPath + File.separator + System.currentTimeMillis() + ".txt");
		try {
			writeName.createNewFile();
			BufferedWriter out = new BufferedWriter(new FileWriter(writeName));
			for (Number number : numbers) {
				out.write(number.getNumber() + "," + number.getEncryptionNumber() + "\r\n");
				// out.newLine();
			}
			out.flush(); // 把缓存区内容压入文件
			out.close(); // 最后记得关闭文件
		} catch (IOException e) {
			e.printStackTrace();
		}
		return writeName.toString();
	}