apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/api/ApolloConfigDemo.java/ApolloConfigDemo/print
class ApolloConfigDemo:  private void print(ConfigFile configFile) {
    if (!configFile.hasContent()) {
      System.out.println("No config file content found for " + configFile.getNamespace());
      return;
    }
    System.out.println("=== Config File Content for " + configFile.getNamespace() + " is as follows: ");
    System.out.println(configFile.getContent());
  }