springboot發起http請求

 

springboot的spring-web項目下有一個

RestTemplate

使用它可以幫助咱們發送一些rest請求。

 

api相對簡單。下面的代碼基本歸納了可以幹什麼了。

 

    @RequestMapping(value = "/query", method = {RequestMethod.GET, RequestMethod.POST, RequestMethod.DELETE})
    public String query(HttpServletRequest request, HttpEntity<String> requestEntity) {

        HttpMethod requestMethod = HttpMethod.resolve(request.getMethod());

        if (HttpMethod.GET == requestMethod) {
            log.info("request method is {}, query path is {}", request.getMethod(), request.getRequestURL() + "?" + request.getQueryString());
        } else if (HttpMethod.POST == requestMethod) {
            log.info("request method is {}, query path is {}, request body is {}", request.getMethod(), request.getRequestURL(), requestEntity.getBody());
        }

        RestTemplate restTemplate = new RestTemplate();

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        requestEntity = new HttpEntity<>(requestEntity.getBody(), headers);

        ResponseEntity<String> response = null;
        try {
            response = restTemplate.exchange(
                    serverUrl + "/path" + (HttpMethod.GET == requestMethod ? ("?" + request.getQueryString()) : ""),
                    requestMethod,
                    requestEntity,
                    String.class);
        } catch (RestClientException e) {
            log.error(e.toString());
            throw e;
        }

        return response.getBody();

    }