调用restTemplate.getForObject时如何处理未找到数据

Question

I am calling restTemplate.getForObject to retrieve a certain value from Mongo DB. How to deal the exception if the expected data is not found in the DB?

Object[] mongodata = restTemplate.getForObject(resulturl,Object[].class,keyval);
list = Arrays.asList(mongodata); 

where keyval is a string that contains a json and resulturl is the url for calling mongo

Answer 1

Basically, you have two main options:

1. Simply wrap the RestTemplate call in a try-catch block and handle the error (in case of 404 not found response, it would be the HttpClientErrorException ). Something like

try {
  Object[] mongodata = restTemplate.getForObject(resulturl,Object[].class,keyval);
  list = Arrays.asList(mongodata);
} catch (HttpClientErrorException e) {
  if (e.getStatusCode() == HttpStatus.NOT_FOUND) {
    // Do something
  } else {
    throw e;
  } 
}

2. Implement a ResponseErrorHandler .

See this post on Baeldung for an example.