接受 Hashmap 作为 POST 调用的主体

Question

我必须编写一个程序来接受 Hashmap 格式的正文。 我创建了带有 Hashmap 值和标头的 HttpEntity。

public <T> void doPOSTRequest(String url, T body, HttpHeaders headers) throws JsonProcessingException {

    HttpEntity<T> request = new HttpEntity<T>(body,headers);
    System.out.println("Printing Request :" + request);
    ResponseEntity<String> response = null;

    //Calling POST Method
    //response=restTemplate.postForObject(url,request,String.class);
     response=restTemplate.exchange(url, HttpMethod.POST,request,String.class);


    System.out.println(response);

}

我面临以下异常：

线程“main”中的异常 org.springframework.web.client.RestClientException：否 [java.util.HashMap] 的 HttpMessageConverter 在 org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:957) 在 org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:733) 在 org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670) 在 org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:579) 在 Com.RESTRequest.doPOSTRequest(RESTRequest.java:39) 在 Com.GenericREST.main(GenericREST.java:30)

Answer 1

尝试使用MultiValueMap，而不是像这样的 Generic

HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<MultiValueMap<String, Object>>(parameters, headers);

完整块：

public <T> void doPOSTRequest(String url, T body, HttpHeaders headers) throws JsonProcessingException {
    HttpEntity<MultiValueMap<String, Object>> request = new HttpEntity<MultiValueMap<String, Object>>(body,headers);
    System.out.println("Printing Request :" + request);
    ResponseEntity<String> response = null;
    //Calling POST Method
    //response=restTemplate.postForObject(url,request,String.class);
     response=restTemplate.exchange(url, HttpMethod.POST,request,String.class);

    System.out.println(response);
}