How can I pass parameter as post to endpoint using RestTemplate in springboot?

I am using RestTemplate in my project to make a post request to an endpoint. Basically I have lambda function written in nestjs. I am injecting lambda service in my java project. If vehicleName if condition passes, I would like to POST that vehicleName to the url. Is there any suggestions on how I can achieve this? I would be testing my application using this command

curl -X POST "https://gdxdispatcher.dev.awstrp.net/dispatcher/service/api/message" -H "accept: */*" -H "Content-Type: application/json" -d "{\"vehicleType\":\"US Mutual Fund,VIP\",\"source\":\"PCS_DATACACHE_TOPIC\"}"

Here is my code

private void callLambdaService(String vehicleTypesParamValue)
{
final String url = "http://localhost:3000/dispatcher/service/api/message";
final String zMETHOD = "callLambdaService - ";
RestTemplate restTemplate = new RestTemplate();
restTemplate.exchange("url", HttpMethod.POST, vehicleName, String.class);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
String result = restTemplate.getForObject(url, String.class);
VehicleType vehicleName=null;
String[] vehicleTypes = vehicleTypesParamValue.split(",");
Set<VehicleType> results = new HashSet<>();
try
{
for (String vehicleTypeParam : vehicleTypes)
{
vehicleName =
vehicleTypeFactory.getVehicleTypeByIspName(
vehicleTypeParam);
if (vehicleName == null)
{
LOGGER.warn("No codes for products or vehicle types were supplied");
}
else if (vehicleName.equals("US Mutual Fund"))
{
LOGGER.info(zMETHOD + "Vehicles provided: "
+ vehicleName.getIspName());
}
else
{
LOGGER.warn(
String.format("Unknown vehicle type provided: [%s]",
vehicleName.getIspName()));
}
}
}catch (Exception e) {
LOG.error("Unable to get vehicletype data", e);
}
}
</details>
# 答案1
**得分**: 1
1. 创建一个表示HTTP请求的数据结构的 **headers**。
```java
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

2. 从 org.json 包中创建一个可修改的名称/值映射集合的 JSONObject，并放入名称和值。

   JSONObject requestBody = new JSONObject();
   requestBody.put("vehicleType", "US Mutual Fund,VIP");
   requestBody.put("source", "PCS_DATACACHE_TOPIC");
   

3. 创建代表HTTP请求或响应的 HttpEntity，在这种情况下，请求由headers和body组成。

   HttpEntity<String> request = new HttpEntity<>(requestBody.toString(), headers);
   

4. 通过 posting 对象到给定的URI模板来创建一个新的资源。它将结果自动转换为responseType参数中指定的类型。然后，我们将ObjectNode定义为我们的资源，响应类型定义为我们的结果。

   ObjectNode result = restTemplate.postForObject("https://gdxdispatcher.dev.awstrp.net/dispatcher/service/api/message", request, ObjectNode.class);