restTemplate get请求添加请求头

使用RestTemplate的exchange方法来发送带有请求头的GET请求。具体步骤如下：

1. 创建HttpHeaders对象，并设置请求头信息。

   HttpHeaders headers = new HttpHeaders();
   headers.add("Authorization", "Bearer token");

2. 创建HttpEntity对象，并将HttpHeaders对象设置到其中。

   HttpEntity<String> entity = new HttpEntity<>(headers);

3. 调用RestTemplate的exchange方法发送GET请求，并将HttpEntity对象作为参数传入。

   ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);

完整代码示例：

RestTemplate restTemplate = new RestTemplate();
String url = "http://example.com/api";
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", "Bearer token");
HttpEntity<String> entity = new HttpEntity<>(headers);
ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);
String responseBody = response.getBody();