Spring Rest API的返回列表

Question

I want to return List from Spring rest api:

@GetMapping("merchant_country")
    public ResponseEntity<?> getMerchantCountry() {
        return ok(Contracts.getSerialversionuid());
    }

I want to get the content from here:

private Map<String, Object> getCountryNameCodeList() {

        String[] countryCodes = Locale.getISOCountries();
        Map<String, Object> list = new HashMap<>();

        for (String countryCode : countryCodes) {

            Locale obj = new Locale("", countryCode);

            list.put(obj.getDisplayCountry().toString(), obj.getCountry());
        }

        return list;
    }

How I can map the result?

Answer 1

Use ResponseEntity when you need more control over the HTTP response (eg setting HTTP headers, providing a different status code).

In other cases, you can simply return a POJO (or a collection), and Spring will handle everything else for you.

class Controller {

    @Autowired
    private Service service;

    @GetMapping("merchant_country")
    public Map<String, Object> getMerchantCountry() {
        return service.getCountryNameCodeList();
    }

}

class Service {

    public Map<String, Object> getCountryNameCodeList() { ... }

}

Locate#getCountry returns String , so it could be Map<String, String> .

Answer 2

Hope this helps, you have to create ResponseEntity as suggested by Andrew

class controller{
@Autowired
    private Service service;
@GetMapping("merchant_country")
    public ResponseEntity<?> getMerchantCountry() {
        return service.getCountryNameCodeList();
    }`enter code here`
}
class service
{
private ResponseEntity<Map<String, Object>> getCountryNameCodeList() {

        String[] countryCodes = Locale.getISOCountries();
        Map<String, Object> list = new HashMap<>();

        for (String countryCode : countryCodes) {

            Locale obj = new Locale("", countryCode);

            list.put(obj.getDisplayCountry().toString(), obj.getCountry());
        }

        return new ResponseEntity<>(list, HttpStatus.OK);
    }