SpringCloud OpenFeign 服务调用传递 token

在Spring Cloud OpenFeign中传递Token，你可以通过定义一个Feign的拦截器来实现。以下是一个简单的例子：

1. 创建一个Feign的拦截器：

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
 
import javax.servlet.http.HttpServletRequest;
 
public class FeignTokenInterceptor implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate template) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (attributes != null) {
            HttpServletRequest request = attributes.getRequest();
            String token = request.getHeader("Authorization"); // 假设token在请求头中
            template.header("Authorization", token); // 将token添加到请求头中
        }
    }
}

2. 在Feign Client接口中添加该拦截器：

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
 
@FeignClient(name = "your-service-name", url = "http://your-service-url", configuration = FeignClientConfiguration.class)
public interface YourServiceClient {
 
    @GetMapping("/endpoint")
    String yourMethod();
}
 
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class FeignClientConfiguration {
 
    @Bean
    public RequestInterceptor requestInterceptor() {
        return new FeignTokenInterceptor();
    }
}

在这个例子中，FeignTokenInterceptor拦截器会从原始请求中提取出Authorization token，并将其添加到Feign客户端发起的每个请求中。这样，在服务间调用时，token就会被传递下去。