apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/api/SimpleApolloConfigDemo.java/SimpleApolloConfigDemo/main
class SimpleApolloConfigDemo:  public static void main(String[] args) throws IOException {
    SimpleApolloConfigDemo apolloConfigDemo = new SimpleApolloConfigDemo();
    System.out.println(
        "Apollo Config Demo. Please input key to get the value. Input quit to exit.");
    while (true) {
      System.out.print("> ");
      String input = new BufferedReader(new InputStreamReader(System.in, Charsets.UTF_8)).readLine();
      if (input == null || input.length() == 0) {
        continue;
      }
      input = input.trim();
      if (input.equalsIgnoreCase("quit")) {
        System.exit(0);
      }
      apolloConfigDemo.getConfig(input);
    }
  }