RestTemplate 具体的使用示例

RestTemplate是Spring框架提供的一个用于发送HTTP请求的模板类，它简化了与RESTful服务进行交互的过程。下面是RestTemplate的使用示例：

1. 发送GET请求并获取响应：

RestTemplate restTemplate = new RestTemplate();
String url = "http://api.example.com/users";
ResponseEntity<String> response = restTemplate.getForEntity(url, String.class);
String responseBody = response.getBody();

2. 发送POST请求并传递参数：

RestTemplate restTemplate = new RestTemplate();
String url = "http://api.example.com/users";
User user = new User("John", "Doe");
ResponseEntity<User> response = restTemplate.postForEntity(url, user, User.class);
User createdUser = response.getBody();

3. 发送PUT请求并更新资源：

RestTemplate restTemplate = new RestTemplate();
String url = "http://api.example.com/users/{id}";
User updatedUser = new User("John", "Smith");
restTemplate.put(url, updatedUser, 1);

4. 发送DELETE请求并删除资源：

RestTemplate restTemplate = new RestTemplate();
String url = "http://api.example.com/users/{id}";
restTemplate.delete(url, 1);