get normal request:
restemplate.getForEntity(url,String.class).getBody();
get export request:
restemplate.getForEntity(url, byte[].class);
put request: parameter entity class
HttpEntity<String> entity = new HttpEntity<String>(JSON.toJSON(targetDto).toString(),headers);
RestTemplate restemplate = RestTemplateHttpsUtil.restTemplate();
restemplate.exchange(url, HttpMethod.PUT,entity, Map.class);
post request: parameter entity class
restemplate.postForEntity(url,targetDto,String.class).getBody();