RestTemplate和访问json [英] RestTemplate and acessing json

问题描述

我已经看过许多其他帖子的回复，但想了解是否有更好的方法来做同样的事情。

I have seen the responses from many other posts but would like to understand if there is a better way to do the same thing.

要求： -
我正在使用restTemplate与Web服务进行通信，该服务返回动态的JSON输出。作为消费者，我不想访问所有领域，但对其中的一些领域感兴趣。我使用Spring框架和Jackson解析器，并找到了访问它的方式

Requirement:- I am using restTemplate to talk to web service which returns JSON output which is dynamic. As a consumer I don't want to access all fields but is interested in few of them. I am using Spring framework with Jackson parser and found the way of accessing it

     String  response = restTemplate.getForObject(targetUrl, String.class);
     System.out.println(response);
     ObjectMapper mapper = new ObjectMapper();
     JsonNode rootNode = mapper.readValue(response, JsonNode.class);
     JsonNode uri = rootNode.get("uri");
     System.out.println(uri.asText());

你知道更好的方法吗？映射到java Object是我不想做的事情，因为json输出不在我的控制中

Do you know any better way to do it? Mapping to java Object is something that I dont want to do as the json output is not in my control

推荐答案

如果你的 RestTemplate 配置了默认 HttpMessageConverters ，由 Jackson2ObjectMapperBuilder提供，您可以直接从 restTemplate.getForObject 获得 JsonNode 。

If your RestTemplate is configured with the default HttpMessageConverters, which is provided by Jackson2ObjectMapperBuilder, you may directly get a JsonNode from restTemplate.getForObject.

例如，

ArrayNode resources = restTemplate.getForObject("/resources", ArrayNode.class);

或者，

ObjectNode resource = restTemplate.getForObject("/resources/123", ObjectNode.class);

请注意 ArrayNode 和 ObjectNode 是 JsonNode 的子类。

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