RestTemplate 请求方法示例

以下是使用 RestTemplate 发送 GET、POST、PUT 和 DELETE 请求的示例：

1. GET 请求

RestTemplate restTemplate = new RestTemplate();
String url = "http://example.com/api/resource";
String response = restTemplate.getForObject(url, String.class);

2. POST 请求

RestTemplate restTemplate = new RestTemplate();
String url = "http://example.com/api/resource";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
String requestBody = "{\"key\":\"value\"}";
HttpEntity<String> requestEntity = new HttpEntity<>(requestBody, headers);
String response = restTemplate.postForObject(url, requestEntity, String.class);

3. PUT 请求

RestTemplate restTemplate = new RestTemplate();
String url = "http://example.com/api/resource";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
String requestBody = "{\"key\":\"value\"}";
HttpEntity<String> requestEntity = new HttpEntity<>(requestBody, headers);
restTemplate.put(url, requestEntity);

4. DELETE 请求

RestTemplate restTemplate = new RestTemplate();
String url = "http://example.com/api/resource/1";
restTemplate.delete(url);