在RESTEasy Client中提取JSON响应的特定节点 [英] Extract specific node of JSON response in RESTEasy Client

问题描述

我正在使用RESTEasy客户端从API检索JSON字符串。 JSON有效负载看起来像这样：

I'm retrieving a JSON string from an API using a RESTEasy client. The JSON payload looks something like this:

{
  "foo1" : "",
  "foo2" : "",
  "_bar" : {
    "items" : [
      { "id" : 1 , "name" : "foo", "foo" : "bar" },
      { "id" : 2 , "name" : "foo", "foo" : "bar" },
      { "id" : 3 , "name" : "foo", "foo" : "bar" },
      { "id" : 4 , "name" : "foo", "foo" : "bar" }
    ]
  }
}

现在我只想提取 items 对象映射的节点。截取JSON响应主体并将其修改为具有 items 作为根节点的最佳方法是什么？

Now I'd like to extract only the items node for object mapping. What is the best way to intercept the JSON response body and modify it to have items as root node?

我正在使用我的API方法的RESTEasy代理框架。

REST客户端代码：

The REST client code:

ResteasyWebTarget target = client.target("https://"+server);
target.request(MediaType.APPLICATION_JSON);
client.register(new ClientAuthHeaderRequestFilter(getAccessToken()));
MyProxyAPI api = target.proxy(MyProxyAPI.class);
MyDevice[] result = api.getMyDevice();

RESTEasy代理接口：

RESTEasy proxy interface:

public interface MyProxyAPI {

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/device")
    public MyDevice[] getMyDevices();

    ...
}

推荐答案

你可以创建一个 ReaderInterceptor 并使用Jackson来操纵你的JSON：

You could create a ReaderInterceptor and use Jackson to manipulate your JSON:

public class CustomReaderInterceptor implements ReaderInterceptor {

    private ObjectMapper mapper = new ObjectMapper();

    @Override
    public Object aroundReadFrom(ReaderInterceptorContext context) 
                      throws IOException, WebApplicationException {

        JsonNode tree = mapper.readTree(context.getInputStream());
        JsonNode items = tree.get("_bar").get("items");
        context.setInputStream(new ByteArrayInputStream(mapper.writeValueAsBytes(items)));
        return context.proceed();
    }
}

然后注册 ReaderInterceptor 已创建上面的 客户 ：

Then register the ReaderInterceptor created above in your Client:

Client client = ClientBuilder.newClient();
client.register(CustomReaderInterceptor.class);

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