Spring Boot:将基本身份验证从REST控制器“中继”到RestTemplate

import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.RestTemplate;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class BasicAuthInterceptor implements ClientHttpRequestInterceptor {

    private final String username;
    private final String password;

    public BasicAuthInterceptor(String username, String password) {
        this.username = username;
        this.password = password;
    }

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        String auth = username + ":" + password;
        byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8));
        String authHeaderValue = "Basic " + new String(encodedAuth);
        request.getHeaders().add("Authorization", authHeaderValue);
        return execution.execute(request, body);
    }
}

@RestController
public class MyController {

    private final RestTemplate restTemplate;

    public MyController() {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getInterceptors().add(new BasicAuthInterceptor("username", "password"));
        this.restTemplate = restTemplate;
    }

    @GetMapping("/data")
    public String getData() {
        String url = "https://api.example.com/data";
        ResponseEntity<String> response = restTemplate.getForEntity(url, String.class);
        return response.getBody();
    }
}