How to Fetch Nifty 50 data from NSE India in Java Spring Boota

 Java code to fetch Nifty 50 data from NSE 

{

    private final ObjectMapper mapper;
    private String cookies;

    @PostConstruct
    public void setCookies() {
        HttpClient client = HttpClient.newHttpClient();

        HttpRequest requestForCookies = HttpRequest.newBuilder()
                .uri(URI.create("https://www.nseindia.com/"))
                .GET()
                .build();

        HttpResponse<String> responseForCookies;
        try {
            responseForCookies = client.send(requestForCookies, HttpResponse.BodyHandlers.ofString());
        } catch (IOException | InterruptedException e) {
            throw new RuntimeException(e);
        }

        cookies = responseForCookies.headers()
                .allValues("set-cookie")
                .stream()
                .map(cookie -> cookie.split(";", 2)[0])
                .collect(Collectors.joining("; "));
    }

    @Override
    public List<NiftyDto> getStockPrices() {
        try {
            String response = getNiftyDataFromNse();
            log.info("reponse from NSE {}", response);
            Base stockInfoList = mapper.readValue(response, Base.class);
            String dataString = mapper.writeValueAsString(stockInfoList.getData());
            return mapper.readValue(dataString, new TypeReference<>() {
            });
        } catch (InterruptedException | IOException e) {
            throw new RuntimeException(e);
        }
    }

    private String getNiftyDataFromNse() throws InterruptedException {
        try {
            HttpClient client = HttpClient.newHttpClient();
            HttpRequest requestForApi = HttpRequest.newBuilder()
                    .uri(URI.create("https://www.nseindia.com/api/equity-stockIndices?index=NIFTY%2050"))
                    .header("Cookie", cookies)
                    .GET()
                    .build();

            HttpResponse<String> responseForApi = client.send(requestForApi, HttpResponse.BodyHandlers.ofString());
            return responseForApi.body();
        } catch (IOException e) {
            setCookies();
            throw new RuntimeException(e);
        }
    }
}