基于json的服务端，model是业务逻辑模型，entity里面是实体类，service是服务器服务，业务逻辑模型是单例模式的，使用getInstant()静态方法获取，通讯端口默认是8010-Json-based service side, model is the business logic model, entity which is the entity class, service is the server service, business logic model is a si