所有方法静态方法具体方法
修饰符和类型	方法	说明
`static Response`	`failure(ServiceState state)`
`static Response`	`failure(ServiceState state, Object message)`
`static Response`	`failure(String message)`
`static Response`	`success(Object data)`

public static Response success(Object data)

public static Response failure(String message)

public static Response failure(ServiceState state)

public static Response failure(ServiceState state,
                               Object message)

类 Response<T>