How to send array with Spring RestTemplate?

Question

How do I send array parameter with Spring RestTemplate?

This is the server side implementation:

@RequestMapping(value = \"/train\", method = RequestM         


        

Answer 1

Here's how I've achieved it:

The REST Controller:

@ResponseBody
@RequestMapping(value = "/test", method = RequestMethod.GET)
public ResponseEntity getPublicationSkus(
       @RequestParam(value = "skus[]", required = true) List skus) {
    ...
}

The request:

List skus = Arrays.asList("123","456","789");

Map params = new HashMap<>();
params.put("skus", toPlainString(skus));

Response response = restTemplate.getForObject("http://localhost:8080/test?skus[]={skus}", 
                                      Response.class, params);

Then you just need to implement a method that converts the List or the String[] to a plain string separated by commas, for example in Java 8 would be something like this:

private static String toPlainString(List skus) {
    return skus.stream().collect(Collectors.joining(","));
}