FIXED Send POST request to server from client, Springboot-CodePudding

I am trying to send a post request, but springboot doesnt seem to recieve it. My code:

Serverside reader

@RestController
public class MessageService {
    @PostMapping(path = "/online")
    public ResponseEntity<?> getResponse(){
        System.out.println("Post Recieved");
        return new ResponseEntity<>(HttpStatus.OK);
    }
}

Client

private String url = "http://127.0.0.1:8090";
public static void main(String[] args) throws IOException {
    SpringApplication.run(Client.class, args);
    new StartupService().init();
}
public String getUrl() {
    return url;
}

public void setUrl(String url) {
    this.url = url;
}

StartupService/ POST Sender

public void init() throws IOException {
       String query = "Body";
        Client client = new Client();
        HttpURLConnection urlConn;
        URL mUrl = new URL(client.getUrl()  "/online");
        urlConn = (HttpURLConnection) mUrl.openConnection();
//query is body
        urlConn.addRequestProperty("Content-Type", "application/"   "POST");
        urlConn.setDoOutput(true);
        urlConn.setRequestProperty("Content-Length", Integer.toString(query.length()));
        urlConn.getOutputStream().write(query.getBytes(StandardCharsets.UTF_8));
        System.out.println("Post Sent");
    }

I tried sending a POST request via Postman, which worked as expected and gave me the console output. But the POST from code isn't recieved from the server.

CodePudding user response：

FIXED: I used a simpler method to send a POST:

        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(userClient.getUrl()  "/online"))
                .POST(HttpRequest.BodyPublishers.ofString(query))
                .build();

        HttpResponse<String> response = client.send(request,
                HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());

        System.out.println("Post Sent");