apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/api/ApolloConfigDemo.java/ApolloConfigDemo/printYaml
class ApolloConfigDemo:  private void printYaml(YamlConfigFile configFile) {
    System.out.println("=== Properties for " + configFile.getNamespace() + " is as follows: ");
    System.out.println(configFile.asProperties());
  }