Java删除properties配置文件中指定键值

Java删除properties配置文件中指定键值

public static boolean deleteKeyValue4Pro(String delete_key, String delete_value) {
		boolean flag = false;
		String toreplace =delete_key + "=" + delete_value + "\n";
		try {
			StringBuffer sb = new StringBuffer();
			String templine;
			File file = new File("ftpconfig.properties");
			BufferedReader bin = new BufferedReader(new FileReader(file));
			while ((templine = bin.readLine()) != null) {
				templine = unicodeToString(templine);
				sb.append(templine + "\n");
			}
			String save = new String(sb.toString());
			System.out.println("before delete:\n" + save + "\n--------------\n");
			System.out.println("delete:" + toreplace + "\n--------------\n");
			Pattern pattern = Pattern.compile(toreplace, Pattern.MULTILINE);
			Matcher matcher = pattern.matcher(save);
			while (matcher.find()) {
				save = matcher.replaceAll("");
			}
			BufferedWriter writer = new BufferedWriter(new FileWriter(file));
			String[] saves = save.split("\n");
			for (int i = 0; i < saves.length; i++) {
				String[] key_values = saves[i].split("=");
				writer.write(stringToUnicode(key_values[0]) + "="
						+ key_values[1] + "\n");
			}
			System.out.println("after delete:\n" + save);
			writer.flush();
			bin.close();
			writer.close();
			flag = true;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return flag;
	}