java 修改 读取properties文件

/**
	 * 根据key获取prpperties中的某一项值
	 * @param key 
	 * @param fileURL properties地址
	 * @return
	 */
	public static String getFileIO(String key, String fileURL) {
		Properties prop = new Properties();
		InputStream in=null;
		try {
			in = new BufferedInputStream(new FileInputStream(fileURL));
			prop.load(in);
			//根据key 获得所对应的value
			return prop.getProperty(key);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}
	/**
	 * 修改并写properties
	 * @param map
	 * @param fileURL
	 * @return
	 */
	public boolean writeData(Map<String, Object> map, String fileURL) {
		Properties prop = new Properties();
		InputStream fis = null;
		OutputStream fos = null;
		try {
			//获得文件
			File file = new File(fileURL);
			//查看文件是否存在
			if (!file.exists()){
				return false;
			}
			fis = new FileInputStream(file);
			prop.load(fis);
			fis.close();// 一定要在修改值之前关闭fis
			fos = new FileOutputStream(file);
			Iterator<Entry<String, Object>> valueSet = map.entrySet().iterator();
			//便利map的值
			while (valueSet.hasNext()) {
				Entry<String, Object> entry = (Entry<String, Object>) valueSet.next();
				String key = entry.getKey().toString();
				String value= entry.getValue().toString();
				prop.setProperty(key, value);
				prop.store(fos, "Update '" + key + "' value");
			}
			fos.close();
			return true;
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fos.close();
				fis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return false;
	}