使用restTEmplate实现

RESTful API调用的示例代码如下：

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

public class RestTemplateExample {

    private static final String API_URL = "https://jsonplaceholder.typicode.com/posts";

    public static void main(String[] args) {
        RestTemplate restTemplate = new RestTemplate();

        HttpHeaders headers = new HttpHeaders();
        headers.set("Accept", "application/json");

        HttpEntity<String> entity = new HttpEntity<>("parameters", headers);

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

        System.out.println(response.getBody());
    }
}

此代码使用RestTemplate调用了一个GET方法，将请求头设置为“Accept: application/json”，并将响应作为字符串返回。您可以将此代码修改为调用其他HTTP方法，例如POST、PUT、DELETE等。