Feign的拦截器RequestInterceptor

清疚 2023-07-16 03:57 7阅读 0赞

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 {
        @Override
        public 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 {
    
        @Autowired
        private ClientFeign clientFeign;
    
    
        @GetMapping("/feign")
        public String feign(@RequestParam String param) {
    
            return clientFeign.weight(param);
        }
    
    }

运行程序测试一下接口  
![在这里插入图片描述][20200318002609761.png]

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: a
      INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : websession: ECF4D97D02EEAFDDA3C15A7F1F050F61
      INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: aaaa, bbbb
      INFO 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_191
      INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: host, 39.108.15.147:8801
      INFO 1 --- [nio-8801-exec-6] c.m.d.client.controller.DemoController   : header: connection, keep-alive

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![在这里插入图片描述][70]

[20200318002609761.png]: /images/20230528/b33e2c13e7e84d9b8e24f246dd85c33b.png
[70]: /images/20230528/017e77a5c105403c8986d8e4c3d49de8.png