spring - HTTP 使用 RestTemplate 获取 header

Question

如何使用 Spring RestTemplate 发送 GET 请求？ 其他问题都使用了POST，但我需要使用GET。 当我运行它时，程序继续工作，但似乎网络被阻塞了，因为它在一个 AsyncTask 中，当我点击这个按钮后尝试运行另一个 asynctask 时，它们将无法工作。

我试过了

String url = "https://api.blah.com/2.0/search/cubes?w=jdfkl&whitespace=1";

MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
map.add("Bearer", accessToken);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED); //copied this from somewhere else, not sure what its for

HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(map, headers);

HttpMessageConverter<String> stringConverter = new StringHttpMessageConverter();
FormHttpMessageConverter formConverter = new FormHttpMessageConverter();
List<HttpMessageConverter<?>> msgConverters = new ArrayList<HttpMessageConverter<?>>();


msgConverters.add(formConverter);
msgConverters.add(new MappingJacksonHttpMessageConverter());
msgConverters.add(stringConverter); 

template.setMessageConverters(msgConverters);
//SetSearchResponseData is my custom class to store the incoming JSON
ResponseEntity<SetSearchResponseData> result = template.exchange(url, HttpMethod.GET, request, SetSearchResponseData.class);
//If I was using post, i could have done SetSearchResponseDataresponse = restTemplate.postForObject(url, request, SetSearchResponseData.class);

Answer 1

RestTemplate getForObject() 方法不支持设置 header 。解决方案是使用 exchange()方法。

所以代替 restTemplate.getForObject(url, String.class, param) (没有标题)，使用

HttpHeaders headers = new HttpHeaders();
headers.set("Header", "value");
headers.set("Other-Header", "othervalue");
...

HttpEntity<Void> requestEntity = new HttpEntity<>(headers);

ResponseEntity<String> response = restTemplate.exchange(
    url, HttpMethod.GET, requestEntity, String.class, param);

最后，使用 response.getBody() 得到你的结果。

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