Spring WebClient:在请求体中传入用户名和密码以获取令牌

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;

public class TokenClient {
    public static void main(String[] args) {
        WebClient webClient = WebClient.builder()
                .baseUrl("https://api.example.com")
                .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                .build();

        String username = "your_username";
        String password = "your_password";

        webClient.post()
                .uri("/token")
                .header(HttpHeaders.AUTHORIZATION, "Basic " + encodeCredentials(username, password))
                .body(BodyInserters.fromValue(""))
                .retrieve()
                .bodyToMono(String.class)
                .subscribe(token -> {
                    // 处理获取到的令牌
                    System.out.println("Token: " + token);
                });
    }

    private static String encodeCredentials(String username, String password) {
        String credentials = username + ":" + password;
        return Base64.getEncoder().encodeToString(credentials.getBytes());
    }
}