Spring RestTemplate和泛型类型ParameterizedTypeReference集合（如List

Question

 public List<T> restFindAll() {

    RestTemplate restTemplate = RestClient.build().restTemplate();
    ParameterizedTypeReference<List<T>>  parameterizedTypeReference = new ParameterizedTypeReference<List<T>>(){};
    String uri= BASE_URI +"/"+ getPath();

    ResponseEntity<List<T>> exchange = restTemplate.exchange(uri, HttpMethod.GET, null,parameterizedTypeReference);
    List<T> entities = exchange.getBody();
    // here entities are List<LinkedHashMap>
    return entities;

}

ParameterizedTypeReference<List<AttributeInfo>>  parameterizedTypeReference = 
    new ParameterizedTypeReference<List<AttributeInfo>>(){};
    ResponseEntity<List<AttributeInfo>> exchange =
  restTemplate.exchange(uri, HttpMethod.GET, null,parameterizedTypeReference);

Answer 1

我使用以下泛型方法解决了这个问题：

public <T> List<T> exchangeAsList(String uri, ParameterizedTypeReference<List<T>> responseType) {
    return restTemplate.exchange(uri, HttpMethod.GET, null, responseType).getBody();
}

然后我可以打电话：

List<MyDto> dtoList = this.exchangeAsList("http://my/url", new ParameterizedTypeReference<List<MyDto>>() {});

这确实使调用者在调用时不得不指定ParameterizedTypeReference,但这意味着我不必像Vels4J的Answer ；