要在Spring Boot中为创建会议API签署HTTP请求，您可以使用AWS SDK for Java提供的AWS4Signer类来计算签名并将其添加到HTTP请求头中。

1. 首先，确保已将必要的依赖项添加到您的Spring Boot项目的pom.xml文件中：

    software.amazon.awssdk
    chime
    2.17.33

2. 创建一个名为AwsChimeService的类，用于处理与AWS Chime服务的交互：

import software.amazon.awssdk.auth.signer.Aws4Signer;
import software.amazon.awssdk.auth.signer.AwsSigningRequestInterceptor;
import software.amazon.awssdk.services.chime.ChimeClient;
import software.amazon.awssdk.services.chime.model.CreateMeetingRequest;
import software.amazon.awssdk.services.chime.model.CreateMeetingResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class AwsChimeService {

    private final ChimeClient chimeClient;

    @Autowired
    public AwsChimeService(AwsSigningRequestInterceptor awsSigningRequestInterceptor) {
        this.chimeClient = ChimeClient.builder()
                .region(Region.US_EAST_1)
                .httpClientBuilder(UrlConnectionHttpClient.builder())
                .overrideConfiguration(ClientOverrideConfiguration.builder()
                        .addExecutionInterceptor(awsSigningRequestInterceptor)
                        .build())
                .build();
    }

    public CreateMeetingResponse createMeeting() {
        CreateMeetingRequest request = CreateMeetingRequest.builder()
                .clientRequestToken(UUID.randomUUID().toString())
                .build();

        return chimeClient.createMeeting(request);
    }
}

3. 创建一个名为AwsChimeConfig的类，用于配置AWS认证和签名：

import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
import software.amazon.awssdk.auth.signer.Aws4Signer;
import software.amazon.awssdk.auth.signer.AwsSigningRequestInterceptor;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AwsChimeConfig {

    @Value("${aws.region}")
    private String region;

    @Bean
    public AwsSigningRequestInterceptor awsSigningRequestInterceptor() {
        Aws4Signer signer = Aws4Signer.create();
        signer.setServiceName("chime");
        signer.setRegionName(region);

        return new AwsSigningRequestInterceptor(signer, DefaultCredentialsProvider.create());
    }
}

4. 创建一个名为AwsChimeController的类，用于处理REST请求：

import software.amazon.awssdk.services.chime.model.CreateMeetingResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api")
public class AwsChimeController {

    private final AwsChimeService awsChimeService;

    @Autowired
    public AwsChimeController(AwsChimeService awsChimeService) {
        this.awsChimeService = awsChimeService;
    }

    @GetMapping("/meeting")
    public ResponseEntity createMeeting() {
        CreateMeetingResponse response = awsChimeService.createMeeting();
        return new ResponseEntity<>(response, HttpStatus.OK);
    }
}

在上述代码中，我们使用@Autowired注解将AwsChimeService自动注入到AwsChimeController中。

5. 确保在application.properties文件中提供AWS访问密钥和区域配置：

aws.accessKeyId=YOUR_ACCESS_KEY_ID
aws.secretKey=YOUR_SECRET_ACCESS_KEY
aws.region=us-east-1

请确保将YOUR_ACCESS_KEY_ID和YOUR_SECRET_ACCESS_KEY替换为您自己的AWS访问密钥。

现在，您可以通过发送GET请求到http://localhost:8080/api/meeting来创建会议。

这就是在Spring Boot中为创建会议API签署HTTP请求的解决方法。请注意，此示例假设您已正确配置了AWS访问密钥和区域。