本系列带着大家深入微服务 Spring体系的各个框架的底层原理。上一篇文章介绍了SpringBoot自动装配原理,本节将带着大家熟悉下SpringCloud体系的调用组件Feign
HttpMessageConverters
Spring Web 中默认使用的注解<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
@SpringBootApplication
@EnableFeignClients
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
@FeignClient("demo")
public interface DemoFeignClient {
@RequestMapping(method = RequestMethod.GET, value = "/getDemo")
DemoDTO getDemo();
}
@RestController
@RequestMapping("/remote")
public class RemoteService {
@Autowired
DemoFeignClient demoFeignClient;
@RequestMapping(value = "/getRemoteDemo")
public DemoDTO getRemoteDemo() {
DemoDTO result = demoFeignClient.getDemo();
return result;
}
}
相关配置解释:
connectTimeout :建立连接所用的超时时间
readTimeout :从连接建立时开始,并在返回响应的时间
1)针对feign配置
feign:
client:
config:
feignName:
connectTimeout: 5000
readTimeout: 5000
2)通用配置
feign:
client:
config:
default:
connectTimeout: 5000
readTimeout: 5000
可以使用feign的拦截器功能实现接口的验证、鉴权功能
1)Basic认证
@Configuration
public class DemoFeignConfiguration {
@Bean
public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
return new BasicAuthRequestInterceptor("user", "password");
}
}
2)自定义拦截器实现
需要实现接口RequestInterceptor
public interface RequestInterceptor {
/**
* Called for every request. Add data using methods on the supplied {@link RequestTemplate}.
*/
void apply(RequestTemplate template);
}
2.1)请求头放上TOKEN认证信息
public class UserInfoRequestInterceptor implements RequestInterceptor {
public void apply(RequestTemplate template) {
template.header("USER-INFO", "TOKEN");
}
}
2.2)将配置添加到feign
feign:
client:
config:
feignName:
connectTimeout: 5000
readTimeout: 5000
requestInterceptors:
- com.example.UserInfoRequestInterceptor
Feign使用过程中需要打印日志可以实现Fegin的Logger功能,可以打印http的调用链路用于功能调试。
1)Logger.Level 级别:
2)配置
2.1) yaml配置
logging:
level:
com.example.feign.DemoFeign: debug
2.2) Config配置
@Configuration
public class FeignConfiguration {
@Bean
Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。
原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。