将服务注入自定义的Jackson序列化器 [英] Inject Service into custom Jackson Serializer

问题描述

我在以下情况下有问题：

Hi I have problem in the following scenario:

我正在将Spring 4.xx与Jackson 2.xx结合使用，并且我正在使用RESTful Web应用程序。我现在面临一个问题，我需要为其中一个模型进行一些自定义序列化，所以我使用了自定义序列化器，但是我也需要在序列化时从数据库中获取一些数据。因此，我尝试将Serivce注入到Serializer中，但它始终保持为空。

I'm using Spring 4.xx with Jackson 2.xx and I'm ompelenting a RESTful Web Application. I'm now faced with te problem that I need some custom serialzation for one of my models, so i used a custom serilaizer, but i also need to fetch some data out of the database while serializing. So I tried to inject my Serivce into the Serializer but it always stays null.

据我所知，如果直接实例化对象，就会发生这种情况，我猜是杰克逊做什么。但是还有什么方法可以使用依赖注入吗？

As far as I have read this happens if you instanciate your object directly, which I guess is what Jackson does. But is there any way to still use Dependency Injection?

此外，如果我让该类实现ApplicationContextAware接口并调用ApplicationContext＃getBean（），它将永远挂起。

Also if I make the class implement the ApplicationContextAware interface and call ApplicationContext#getBean() it hangs forever.

下面是一些代码来说明我的问题

Here is some code to illustrate my problem

Serialzer.java

Serialzer.java

public class TheSerializer extends JsonSerializer<MyObject>
  implements ApplicationContextAware {

  @Autowired
  ITheService theService;

  ApplicationContext ctx;

  public vodi serialize(MyObject o, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
    if(theService == null) {
      theService = ctx.getBean(ITheService.class); //This is where it hangs
      //If I don't do this I get a NPE if I try to use theSerivice
    }
  }
}

我的配置主要基于注释，只有databse内容在xml中完成。

My configuration is mainly annotaion based, only the databse stuff is done in xml.

预先感谢

wastl

推荐答案

您可以使用@Configurable spring批注将Spring bean注入非spring bean中。

You can use @Configurable spring annotation to inject spring bean into the non spring beans.

一些说明操作方法： http://www.kubrynski.com/2013/09/injecting-spring-dependencies-into-non .html

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