http 프로토콜로 통신하는법

RestTemplate

https://www.baeldung.com/spring-resttemplate-post-json

https://recordsoflife.tistory.com/360

public void reqThreadStart(String jsonData) { //8080 포트 서버임, 8081로 전송
					
		logger.debug("받은 jsonData: "  + jsonData);	
		RestTemplate rt = new RestTemplate();
		
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.APPLICATION_JSON_UTF8);

		//MultiValueMap<String, String> parames = new LinkedMultiValueMap<>();
		//parames.add("jsonData", jsonData);
		HttpEntity<String> request = new HttpEntity<>(jsonData, headers);
		
		//ResponseEntity response = rt.exchange("http://localhost:8081/test", HttpMethod.GET, request, String.class);		
		String response = rt.postForObject("http://localhost:8081/test", request, String.class);		
		ObjectMapper objectMapper = new ObjectMapper();
		//json 데이터 전송		

		System.out.println(response);
	}

@PostMapping("/test")  //받는 8081 서버
	public String 체크(@RequestBody String jsonData) {
		
		System.out.println("들어왔나?");
	
		System.out.println(jsonData);		
		return jsonData;		
	}

Unirest

https://easybrother0103.tistory.com/103

WebClient

https://www.baeldung.com/spring-webclient-resttemplate