springboot获取令牌以调用另一个服务

import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;

public class TokenClient {
    private static final String AUTH_SERVER_URL = "http://auth-server/oauth/token";
    private static final String CLIENT_ID = "your-client-id";
    private static final String CLIENT_SECRET = "your-client-secret";

    public String getAccessToken() {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        params.add("grant_type", "client_credentials");
        params.add("client_id", CLIENT_ID);
        params.add("client_secret", CLIENT_SECRET);

        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(params, headers);
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<Map> response = restTemplate.postForEntity(AUTH_SERVER_URL, request, Map.class);

        return (String) response.getBody().get("access_token");
    }
}

import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;

public class ProfileClient {
    private static final String PROFILE_SERVICE_URL = "http://profile-service/user/profile";
    private String accessToken;

    public ProfileClient(String accessToken) {
        this.accessToken = accessToken;
    }

    public String getUserProfile() {
        HttpHeaders headers = new HttpHeaders();
        headers.setBearerAuth(accessToken);
        HttpEntity<String> request = new HttpEntity<>(headers);

        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.exchange(PROFILE_SERVICE_URL, HttpMethod.GET, request, String.class);

        return response.getBody();
    }
}

public String refreshAccessToken() {
    // 类似 getAccessToken 方法，但 grant_type 改为 "refresh_token"，并携带 refresh_token 参数
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig {
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**")
                        .allowedOrigins("http://user-service")
                        .allowedMethods("GET", "POST", "PUT", "DELETE")
                        .allowedHeaders("*")
                        .allowCredentials(true);
            }
        };
    }
}