Feign的拦截器RequestInterceptor

本文主要是介绍Feign的拦截器RequestInterceptor，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

SpringCloud的微服务使用Feign进行服务间调用的时候可以使用RequestInterceptor统一拦截请求来完成设置header等相关请求，但RequestInterceptor和ClientHttpRequestInterceptor有点不同，它拿不到原本的请求，所以要通过其他方法来获取原本的请求

首先创建自定义的RequestInterceptor

这里通过RequestContextHolder获取到当前的request

@Slf4j
@Component
public class MyFeignInterceptor implements RequestInterceptor {@Overridepublic void apply(RequestTemplate template) {ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();log.info("===request: {}", template.url());template.header("aaaa", "bbbb");}
}

然后定义一个feign的接口类

@FeignClient(name = "SPRING-CLOUD-CLIENT-DEMO")
public interface ClientFeign {@GetMapping("/demo/get")String weight(@RequestParam String param);
}

再创建一个controller

@Slf4j
@RestController
@RequestMapping("/interceptor")
public class InterceptorController {@Autowiredprivate ClientFeign clientFeign;@GetMapping("/feign")public String feign(@RequestParam String param) {return clientFeign.weight(param);}}

运行程序测试一下接口
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查看程序打印

可以看到进入了我们自定义的RequestInterceptor

INFO 25936 --- [ctor-http-nio-3] c.m.d.g.interceptor.MyFeignInterceptor   : ===request: /demo/weight?param=a

再查看feign调用的程序日志，可以看到设置的header信息

  INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : aaaa: aINFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : websession: ECF4D97D02EEAFDDA3C15A7F1F050F61INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: aaaa, bbbbINFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: accept, */*INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: user-agent, Java/1.8.0_191INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: host, 39.108.15.147:8801INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: connection, keep-alive

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