spring cloud 如何生成有效但不可用Authorization，请写出完整代码

可以使用以下代码：

String authorization = Base64.getEncoder().encodeToString("username:password".getBytes());
HttpHeaders headers = new HttpHeaders();
headers.set("Authorization", "Basic " + authorization);
HttpEntity<String> entity = new HttpEntity<>("parameters", headers);
ResponseEntity<String> response = restTemplate.exchange("url", HttpMethod.GET, entity, String.class);