Spring RestTemplate处理请求的泛型的情况：ParameterizedTypeReference

 

参考文章： https://stackoverflow.com/questions/36915823/spring-resttemplate-and-generic-types-parameterizedtypereference-collections-lik

 

 

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

 

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

 

 比较完整的示例代码：

private HttpHeaders buildHeader() {
    HttpHeaders headers = new HttpHeaders();
    headers.set("authToken", "hello-token");
    headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
    return headers;
}


public <T, E> List<T> postExchangeAsList(String url, E body,
        ParameterizedTypeReference<List<T>> responseType) {
    Stopwatch sw = Stopwatch.createStarted();
    HttpHeaders headers = buildHeader();
    HttpEntity<E> entity = new HttpEntity<E>(body, headers);
    HttpEntity<List<T>> httpResponse =
            restTemplate.exchange(url, HttpMethod.POST, entity, responseType);
    List<T> result = httpResponse.getBody();
    return result;
}



private <T> List<T> getExchangeAsList(String url,
        ParameterizedTypeReference<List<T>> responseType) {
    Stopwatch sw = Stopwatch.createStarted();

    HttpHeaders headers = buildHeader();
    HttpEntity<Object> entity = new HttpEntity<Object>(headers);

    ResponseEntity<List<T>> response =
            restTemplate.exchange(url, HttpMethod.GET, entity, responseType);
    List<T> result = response.getBody();
    return result;
}


List<String> list = getExchangeAsList("http://my/helloGet", new ParameterizedTypeReference<List<String>>>() {
                });


String body = "hello world";
List<String> list = postExchangeAsList("http://my/helloPost", body,
                new ParameterizedTypeReference<List<String>>() {
                });