接受Hashmap作为POST调用的主体

Question

我必须写一个程序，它将接受Hashmap格式的body。我已经用Hashmap值创建了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);

}

我面临以下例外：

异常线程"main"org.springframework.web.client.RESTClientExcture： No HttpMessageConzer for[java.util.HashMap]atorg.springframework.web.client.RESTTemboard$HttpEntipleestCallback.do在org.springframework.web.client.RESTTemplate.do执行（RETemplate.java:733）在org.springframework.web.client.RETemplate.execute（RETemplate.java:670）在org.springframework.web.client.RETemplate.exchange（RETemplate.java:579）在Com。RESTRequest.do发布请求（RESTRequest.java:39）在Com.GenericREST. main（GenericREST. java： 30）

Answer 1

尝试使用MultiValueMap而不是像这样的泛型

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

全块：

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);
}