您需要一个类来表示您的json结构：

class Person {
    private String name;
    private int age;
  }

  class PersonMap {
    private Map<String, Person> people;
  }

  @Test
  public void test() {
    String json =
        "{\r\n"
            + "\"people\":{\r\n"
            + "      \"1\": {\r\n"
            + "          \"name\": \"A\",\r\n"
            + "          \"age\": 5\r\n"
            + "         },\r\n"
            + "      \"2\": {\r\n"
            + "          \"name\": \"B\",\r\n"
            + "          \"age\": 6\r\n"
            + "         },\r\n"
            + "      \"3\": {\r\n"
            + "          \"name\": \"C\",\r\n"
            + "          \"age\": 7\r\n"
            + "         }\r\n"
            + "}\r\n"
            + "}";

    Gson gson = new GsonBuilder().setPrettyPrinting().create();

    var persons = gson.fromJson(json, PersonMap.class).people.values();
    for (Person person : persons) {
      System.out.println(person.name + " " + person.age);
    }
  }