适用于Jackson的RESTEasy和ContextResolver <ObjectMapper>

Question

我的RESTEasy JSON响应的自定义问题.

在web.xml我使用自动扫描:

<context-param>
    <param-name>resteasy.scan</param-name>
    <param-value>true</param-value>
</context-param>

这是我的自定义类ObjectMapper,(我设置了非空字段和新的人类可读日期):

@Provider
@Produces(MediaType.APPLICATION_JSON)
public class JacksonConfig implements ContextResolver<ObjectMapper> {
    private Logger log = Logger.getLogger(PropertiesConfig.LOG_CATEGORY);
    private ObjectMapper objectMapper;  

    public JacksonConfig() throws Exception  {  

        objectMapper = new ObjectMapper();
        objectMapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
        objectMapper.setDateFormat(new SimpleDateFormat("dd.MM.yyyy"));  
        objectMapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
    }

    @Override
    public ObjectMapper getContext(Class<?> arg0) {
        return objectMapper;
    }  
}

这是我的servlet:

@Path("/search")
public class Search extends ArtesAPI {

    @GET
    @Path("/")
    @Produces(MediaType.APPLICATION_JSON)
    public Response search(@Context HttpServletRequest request){
        RequestManager reqManager = new RequestManager(request);
        MyResponse response = reqManager.doSearchRequest();
        return Response.status(200).entity(response).build();
    }
}

当我部署到服务器时,RESTEasy打印此日志:

10:43:44,320 INFO  [TomcatDeployment] deploy, ctxPath=/MyServer
10:43:44,544 INFO  [ConfigurationBootstrap] Adding scanned @Provider: myserver.servlets.JacksonConfig
10:43:44,545 INFO  [ConfigurationBootstrap] Adding scanned resource: myserver.servlets.Search

但是当我调用搜索API时,我收到了这样的回复:(这里只是响应的一小部分)

{
"entry": [
    {
        "name": "abbigliamento",
        "description": null,
        "lastUpdate": 1375448941000,
        "subCategory": null
    },
    {
        "name": "car",
        "description": null,
        "lastUpdate": null,
        "subCategory": null
    }
}

我的服务器响应为我提供了空字段,lastUpdate以毫秒为单位.

我哪里出错了？

提前致谢.

Answer 1

您可以通过扩展JacksonJsonProvider.

@Provider
public class MyJacksonJsonProvider extends JacksonJsonProvider
{
    @Override
    public void writeTo(Object value, Class<?> type, Type genericType, Annotation[] annotations, 
            MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) 
            throws IOException 
    {
        ObjectMapper mapper = locateMapper(type, mediaType);

        mapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
        mapper.setDateFormat(new SimpleDateFormat("dd.MM.yyyy"));  
        mapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);

        super.writeTo(value, type, genericType, annotations, mediaType, httpHeaders, entityStream);
    }
}

Answer 2

感谢 Greg Whitaker*，我找到了解决方案！

我必须添加这个依赖项

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-jaxrs</artifactId>
    <version>1.9.13</version>
</dependency>

• 他的解决方案迫使我添加这个依赖项。