接口和@RequestBody [英] Interfaces and @RequestBody

问题描述

我目前正在开展一个项目，该项目允许用户在给定的时间段内（通过网络）预订所选资源的使用。在这个程序中，我试图遵循Spring的接口编程的哲学（以及通用的最佳实践），因此我尝试在具体类中重复功能的任何地方使用接口。

I'm currently working on a project which allows users to book (via the web) the use of a chosen resource for a given period of time. In this program I am trying to keep with Spring's philosophy (and the general best practice) of programming to interfaces and as such I try to use interfaces anywhere where functionality is repeated among concrete classes.

我创建的一个接口称为BookableResourceController，它指定控制器处理所有要预订的资源所需的最低功能所需的方法。我还使用了第二个接口BookableResource，它识别哪些对象模拟了允许通过应用程序预订的资源。

One interface I have created is called a BookableResourceController which specifies the methods needed by a controller to handle the minimum required functionality for any type of resource to be booked. I also make use of a second interface, BookableResource, which identifies which objects model a resource that is allowed to be booked through the application.

我目前遇到的问题是，BookableResourceController定义的一些方法使用@RequestBody映射将JSON对象转换为方法参数，并且自杰克逊以来只能将JSON转换为SimpleType对象，如果我将输入参数指定为BookableResource，则会收到错误。

The problem I am currently running into is that a few of the methods defined by BookableResourceController use the @RequestBody mapping to convert a JSON object into a method parameter, and since Jackson can only convert JSON into "SimpleType" objects, I receive an error if I specify the input parameter to be a BookableResource.

@RequestMapping(value="/delete.html", method = RequestMethod.POST)  
public ModelAndView processDeleteResource(
    @RequestBody BookableResource resource); 

无法构造
org.codehaus.jackson的实例.map.type.SimpleType，
问题：抽象类型只能是
实例化，附加类型
信息

Can not construct instance of org.codehaus.jackson.map.type.SimpleType, problem: abstract types can only be instantiated with additional type information

据我所知，这个错误意味着我需要定义BookableResource的特定实现，这意味着我很可能需要从接口中排除这些方法，即使任何用于此目的的控制器都将需要那些方法。

From what I can tell this error means that I will need to define a specific implementation of BookableResource, meaning I will most likely need to exclude these methods from the interface even though any controller that is to be used for this purpose will require those methods.

我要问的是，是否有人知道如何将接口定义为 @RequestBody <期望的对象/ code>使用JSON进行映射，或者是否有人建议如何构建我的控制器接口以包含这些方法？

What I am asking is if anyone knows a way to define an interface as the object that is expected from an @RequestBody mapping using JSON, or does anyone have any suggestions of how to structure my contoller interface in order to include these methods?

干杯

推荐答案

我不确定它会起作用，但你可以试着让它变得通用：

I'm not sure it would work, but you can try to make it generic:

public interface BookableResourceController<R extends BookableResource> {
    @RequestMapping(value="/delete.html", method = RequestMethod.POST)
    public ModelAndView processDeleteResource(@RequestBody R resource); 
}

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