RestTemplate:如何获得通用列表响应 [英] RestTemplate: how to get generic List response

问题描述

我们正在为我们的应用程序使用公共包中的 restemplate.所以我们需要使用泛型.

We are using restemplate in a commons package for our application. So we need to use generic types.

我阅读了很多关于此的解决方案，但似乎没有一个对我们不起作用，而且我们不断得到(在客户端):

I read many solutions about that, but none seems to not work for us, and we constantly get (on the client side):

java.util.LinkedHashMap cannot be cast to nc.gouv.dsf.ranch.model.Pays

这是代码(总结):

public List<T> findAll(C criteria) {
[...]
                ResponseEntity<List<T>> response = 
                    restTemplateFactory.getRestTemplate().exchange(
                            url, 
                            HttpMethod.GET, 
                    new HttpEntity<>(createHttpHeaders(srvId)),
                    new ParameterizedTypeReference<List<T>>() {}
                            );          

            return response.getBody();
}

我虽然 ParameterizedTypeReference 可以解决此类问题，但它不起作用.

I though ParameterizedTypeReference what the solution to this kind of problems but its doesn't work.

PS:我们使用的是 springboot 1.3.1.RELEASE

PS: we are using springboot 1.3.1.RELEASE

推荐答案

似乎请求正在返回一个 Map 并且我们正在尝试将其转换为列表，因此出现异常.您可以尝试以下操作:

It seems the request is returning a Map and we are trying to cast it into list, hence the exception. Can you try the following:

ResponseEntity<Map<String, Object>> response = 
            restTemplateFactory.getRestTemplate().exchange(
                    url, 
                    HttpMethod.GET, 
            new HttpEntity<>(createHttpHeaders(srvId)),
            new ParameterizedTypeReference<Map<String, Object>>() {}
                    );

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