一、FeignClient注解
FeignClient注解被@Target(ElementType.TYPE)修饰，表示FeignClient注解的作用目标在接口上

Copyright 2013-2016 the original author or authors.
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package org.springframework.cloud.openfeign;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.springframework.core.annotation.AliasFor;

/**

Annotation for interfaces declaring that a REST client with that interface should be
created (e.g. for autowiring into another component). If ribbon is available it will be
used to load balance the backend requests, and the load balancer can be configured
using a @RibbonClient with the same name (i.e. value) as the feign client.
@author Spencer Gibb
@author Venil Noronha
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FeignClient {

/**
- The name of the service with optional protocol prefix. Synonym for {@link #name()
- name}. A name must be specified for all clients, whether or not a url is provided.
- Can be specified as property key, eg: ${propertyKey}.
  */
  @AliasFor(“name”)
  String value() default “”;
/**
- The service id with optional protocol prefix. Synonym for {@link #value() value}.
- @deprecated use {@link #name() name} instead
  */
  @Deprecated
  String serviceId() default “”;
/**
- The service id with optional protocol prefix. Synonym for {@link #value() value}.
  */
  @AliasFor(“value”)
  String name() default “”;
/**
- Sets the @Qualifier value for the feign client.
  */
  String qualifier() default “”;
/**
- An absolute URL or resolvable hostname (the protocol is optional).
  */
  String url() default “”;
/**
- Whether 404s should be decoded instead of throwing FeignExceptions
  */
  boolean decode404() default false;
/**
- A custom @Configuration for the feign client. Can contain override
- @Bean definition for the pieces that make up the client, for instance
- {@link feign.codec.Decoder}, {@link feign.codec.Encoder}, {@link feign.Contract}.
- @see FeignClientsConfiguration for the defaults
  */
  Class<?>[] configuration() default {};
/**
- Fallback class for the specified Feign client interface. The fallback class must
- implement the interface annotated by this annotation and be a valid spring bean.
  */
  Class<?> fallback() default void.class;
/**
- Define a fallback factory for the specified Feign client interface. The fallback
- factory must produce instances of fallback classes that implement the interface
- annotated by {@link FeignClient}. The fallback factory must be a valid spring
- bean.
- @see feign.hystrix.FallbackFactory for details.
  */
  Class<?> fallbackFactory() default void.class;
/**
- Path prefix to be used by all method-level mappings. Can be used with or without
- @RibbonClient.
  */
  String path() default “”;
/**
- Whether to mark the feign proxy as a primary bean. Defaults to true.
  */
  boolean primary() default true;

}
声明接口之后，在代码中通过@Resource注入之后即可使用。@FeignClient标签的常用属性如下：

name：指定FeignClient的名称，如果项目使用了Ribbon，name属性会作为微服务的名称，用于服务发现
url: url一般用于调试，可以手动指定@FeignClient调用的地址
decode404:当发生http 404错误时，如果该字段位true，会调用decoder进行解码，否则抛出FeignException
configuration: Feign配置类，可以自定义Feign的Encoder、Decoder、LogLevel、Contract
fallback: 定义容错的处理类，当调用远程接口失败或超时时，会调用对应接口的容错逻辑，fallback指定的类必须实现@FeignClient标记的接口
fallbackFactory: 工厂类，用于生成fallback类示例，通过这个属性我们可以实现每个接口通用的容错逻辑，减少重复的代码
path: 定义当前FeignClient的统一前缀
二：实例
下面指定一个说话的接口，url配置的是同本地的前缀，name是要调用的微服务名称，在erurka启用下生效，此外还指定了失效转移的配置，使用的是Sentinel实现，详情见上篇文章

package cn.chinotan.feign;

import cn.chinotan.SaySomeThing;
import cn.chinotan.config.feign.FeignConfiguration;
import cn.chinotan.feign.fallback.SayServiceFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

/**

@program: test
@description: 说接口
@author: xingcheng
@create: 2019-01-19 18:05
**/
@FeignClient(name = “sayService”, url = “http://localhost:11111”, fallback = SayServiceFallback.class, configuration = FeignConfiguration.class)
public interface SayService {

/**
- 说
- @param saySomeThing
- @return
  */
  @RequestMapping(value = “/feign/hello”, method = RequestMethod.POST)
  SaySomeThing saySomeThing(@RequestBody SaySomeThing saySomeThing);

}
在使用fallback属性时，需要使用@Component注解

package cn.chinotan.feign.fallback;

import cn.chinotan.SaySomeThing;
import cn.chinotan.feign.SayService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**

@program: test
@description: say快速失败
@author: xingcheng
@create: 2019-01-19 18:18
**/
public class SayServiceFallback implements SayService {

Logger logger = LoggerFactory.getLogger(SayServiceFallback.class);

@Override
public SaySomeThing saySomeThing(SaySomeThing saySomeThing) {
SaySomeThing saySomeThingFail = new SaySomeThing();
saySomeThingFail.setName(“错误”);
saySomeThingFail.setWords(“错误的话”);
logger.error(“调用失败”);
return saySomeThingFail;
}
}
接下是配置feign的配置信息

package cn.chinotan.config.feign;

import cn.chinotan.feign.fallback.EchoServiceFallback;
import cn.chinotan.feign.fallback.SayServiceFallback;
import feign.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**

@program: test
@description: FeignConfiguration
@author: xingcheng
@create: 2019-01-12 18:44
**/
@Configuration
public class FeignConfiguration {
@Bean
public SayServiceFallback sayServiceFallback() {
return new SayServiceFallback();
}

@Bean
public Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
两个bean指定降级类和日志级别打印，并注入到spring上下文

每一个被创建的Feign客户端都会有一个logger。该logger默认的名称为Feign客户端对应的接口的全限定名。Feign日志记录只能响应DEBUG日志级别。

例如

feign日志

logging.level.cn.chinotan.feign: DEBUG
针对每一个Feign客户端，可以配置一个Logger.Level对象，通过该对象控制日志输出内容。

Logger.Level有如下几种选择：

NONE, 不记录日志 (默认)。

BASIC, 只记录请求方法和URL以及响应状态代码和执行时间。

HEADERS, 记录请求和应答的头的基本信息。

FULL, 记录请求和响应的头信息，正文和元数据。

之后配置异常报警信息，主要通过实现ErrorDecoder接口实现

package cn.chinotan.config.feign;

import feign.FeignException;
import feign.Response;
import feign.codec.ErrorDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;

import static feign.FeignException.errorStatus;

/**

@program: test
@description: feign调用异常统一处理
@author: xingcheng
@create: 2019-01-19 19:47
**/
@Configuration
public class MyErrorDecoder implements ErrorDecoder {

Logger logger = LoggerFactory.getLogger(MyErrorDecoder.class);

@Override
public Exception decode(String methodKey, Response response) {
FeignException exception = errorStatus(methodKey, response);
// 报警
logger.error(“methodKey: {}, reason is {}”, methodKey, response.toString());
return exception;
}

}
三：运行

配置一个请求controller

package cn.chinotan.controller;

import cn.chinotan.SaySomeThing;
import cn.chinotan.feign.SayService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**

@program: test
@description: 最简单的使用 Sentinel 的例子
@author: xingcheng
@create: 2019-01-20 18:01
**/
@RestController
@RequestMapping("/feign")
public class FeignController {

@Autowired
SayService sayService;

@PostMapping(value = “/hello”)
public SaySomeThing hello(@RequestBody SaySomeThing saySomeThing) {
// throw new RuntimeException(“我是异常”);
return saySomeThing;
}

@PostMapping(value = “/say”)
public SaySomeThing echoFeign(@RequestBody SaySomeThing saySomeThing) {
return sayService.saySomeThing(saySomeThing);
}
}
运行结果：

日志打印：

INFO: log base dir is: /Users/xingcheng/logs/csp/
INFO: log name use pid is: false
2019-01-19 20:11:45.916 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> POST http://localhost:11111/feign/hello HTTP/1.1
2019-01-19 20:11:45.916 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Type: application/json;charset=UTF-8
2019-01-19 20:11:45.916 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Length: 36
2019-01-19 20:11:45.917 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:11:45.917 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“name”:“chinotan”,“words”:“世界”}
2019-01-19 20:11:45.917 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> END HTTP (36-byte body)
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— HTTP/1.1 200 (27ms)
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] cache-control: no-cache, no-store, max-age=0, must-revalidate
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] content-type: application/json;charset=UTF-8
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] date: Sat, 19 Jan 2019 12:11:45 GMT
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] expires: 0
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] pragma: no-cache
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] transfer-encoding: chunked
2019-01-19 20:11:45.944 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-content-type-options: nosniff
2019-01-19 20:11:45.945 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-frame-options: DENY
2019-01-19 20:11:45.945 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-xss-protection: 1; mode=block
2019-01-19 20:11:45.945 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:11:45.951 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“name”:“chinotan”,“words”:“世界”}
2019-01-19 20:11:45.951 DEBUG 2932 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— END HTTP (36-byte body)
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> POST http://localhost:11111/feign/hello HTTP/1.1
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Type: application/json;charset=UTF-8
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Length: 36
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“name”:“chinotan”,“words”:“世界”}
2019-01-19 20:37:41.552 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> END HTTP (36-byte body)
2019-01-19 20:37:41.559 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— HTTP/1.1 200 (7ms)
2019-01-19 20:37:41.559 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] cache-control: no-cache, no-store, max-age=0, must-revalidate
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] content-type: application/json;charset=UTF-8
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] date: Sat, 19 Jan 2019 12:37:41 GMT
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] expires: 0
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] pragma: no-cache
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] transfer-encoding: chunked
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-content-type-options: nosniff
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-frame-options: DENY
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-xss-protection: 1; mode=block
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“name”:“chinotan”,“words”:“世界”}
2019-01-19 20:37:41.560 DEBUG 2932 — [io-11111-exec-7] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— END HTTP (36-byte body)
可以看到请求地址，入参和出参，headers信息都打印出来了

接下来试试异常情况，修改controller:

@PostMapping(value = “/hello”)
public SaySomeThing hello(@RequestBody SaySomeThing saySomeThing) {
throw new RuntimeException(“我是异常”);
// return saySomeThing;
}
运行结果：

日志打印：

INFO: log base dir is: /Users/xingcheng/logs/csp/
INFO: log name use pid is: false
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> POST http://localhost:11111/feign/hello HTTP/1.1
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Type: application/json;charset=UTF-8
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] Content-Length: 36
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“name”:“chinotan”,“words”:“世界”}
2019-01-19 20:40:18.049 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] —> END HTTP (36-byte body)
2019-01-19 20:40:18.083 ERROR 3137 — [io-11111-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.RuntimeException: 我是异常] with root cause

java.lang.RuntimeException: 我是异常
at cn.chinotan.controller.FeignController.hello(FeignController.java:26) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:158) ~[spring-boot-actuator-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:126) ~[spring-boot-actuator-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:111) ~[spring-boot-actuator-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) ~[spring-boot-actuator-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 320) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . a c c e s s . i n t e r c e p t . F i l t e r S e c u r i t y I n t e r c e p t o r . i n v o k e (F i l t e r S e c u r i t y I n t e r c e p t o r . j a v a : 127) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . a c c e s s . i n t e r c e p t . F i l t e r S e c u r i t y I n t e r c e p t o r . d o F i l t e r (F i l t e r S e c u r i t y I n t e r c e p t o r . j a v a : 91) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 334) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . s e s s i o n . S e s s i o n M a n a g e m e n t F i l t e r . d o F i l t e r (S e s s i o n M a n a g e m e n t F i l t e r . j a v a : 137) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 334) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . s e r v l e t a p i . S e c u r i t y C o n t e x t H o l d e r A w a r e R e q u e s t F i l t e r . d o F i l t e r (S e c u r i t y C o n t e x t H o l d e r A w a r e R e q u e s t F i l t e r . j a v a : 170) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 334) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . a u t h e n t i c a t i o n . w w w . B a s i c A u t h e n t i c a t i o n F i l t e r . d o F i l t e r I n t e r n a l (B a s i c A u t h e n t i c a t i o n F i l t e r . j a v a : 158) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . w e b . f i l t e r . O n c e P e r R e q u e s t F i l t e r . d o F i l t e r (O n c e P e r R e q u e s t F i l t e r . j a v a : 107) [s p r i n g - w e b - 5.0.7 . R E L E A S E . j a r : 5.0.7 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 334) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . h e a d e r . H e a d e r W r i t e r F i l t e r . d o F i l t e r I n t e r n a l (H e a d e r W r i t e r F i l t e r . j a v a : 66) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . w e b . f i l t e r . O n c e P e r R e q u e s t F i l t e r . d o F i l t e r (O n c e P e r R e q u e s t F i l t e r . j a v a : 107) [s p r i n g - w e b - 5.0.7 . R E L E A S E . j a r : 5.0.7 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy $V i r t u a l F i l t e r C h a i n . d o F i l t e r (F i l t e r C h a i n P r o x y . j a v a : 334) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . c o n t e x t . r e q u e s t . a s y n c . W e b A s y n c M a n a g e r I n t e g r a t i o n F i l t e r . d o F i l t e r I n t e r n a l (W e b A s y n c M a n a g e r I n t e g r a t i o n F i l t e r . j a v a : 56) [s p r i n g - s e c u r i t y - w e b - 5.0.6 . R E L E A S E . j a r : 5.0.6 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . w e b . f i l t e r . O n c e P e r R e q u e s t F i l t e r . d o F i l t e r (O n c e P e r R e q u e s t F i l t e r . j a v a : 107) [s p r i n g - w e b - 5.0.7 . R E L E A S E . j a r : 5.0.7 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . s e c u r i t y . w e b . F i l t e r C h a i n P r o x y$ VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at com.alibaba.csp.sentinel.adapter.servlet.CommonFilter.doFilter(CommonFilter.java:89) ~[sentinel-web-servlet-1.4.0.jar:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.coyote.AbstractProtocol $C o n n e c t i o n H a n d l e r . p r o c e s s (A b s t r a c t P r o t o c o l . j a v a : 790) [t o m c a t - e m b e d - c o r e - 8.5.31 . j a r : 8.5.31] a t o r g . a p a c h e . t o m c a t . u t i l . n e t . N i o E n d p o i n t$ SocketProcessor.doRun(NioEndpoint.java:1468) [tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.31.jar:8.5.31]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_162]
at java.util.concurrent.ThreadPoolExecutor $Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_162] at org.apache.tomcat.util.threads.TaskThread$ WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.31.jar:8.5.31]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_162]

2019-01-19 20:40:18.112 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— HTTP/1.1 500 (62ms)
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] cache-control: no-cache, no-store, max-age=0, must-revalidate
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] connection: close
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] content-type: application/json;charset=UTF-8
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] date: Sat, 19 Jan 2019 12:40:18 GMT
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] expires: 0
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] pragma: no-cache
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] transfer-encoding: chunked
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-content-type-options: nosniff
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-frame-options: DENY
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] x-xss-protection: 1; mode=block
2019-01-19 20:40:18.113 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing]
2019-01-19 20:40:18.114 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] {“timestamp”:“2019-01-19T12:40:18.094+0000”,“status”:500,“error”:“Internal Server Error”,“message”:“我是异常”,“path”:"/feign/hello"}
2019-01-19 20:40:18.114 DEBUG 3137 — [io-11111-exec-2] cn.chinotan.feign.SayService : [SayService#saySomeThing] <— END HTTP (136-byte body)
2019-01-19 20:40:18.116 ERROR 3137 — [io-11111-exec-2] cn.chinotan.config.feign.MyErrorDecoder : methodKey: SayService#saySomeThing(SaySomeThing), reason is HTTP/1.1 500
cache-control: no-cache, no-store, max-age=0, must-revalidate
connection: close
content-type: application/json;charset=UTF-8
date: Sat, 19 Jan 2019 12:40:18 GMT
expires: 0
pragma: no-cache
transfer-encoding: chunked
x-content-type-options: nosniff
x-frame-options: DENY
x-xss-protection: 1; mode=block

{“timestamp”:“2019-01-19T12:40:18.094+0000”,“status”:500,“error”:“Internal Server Error”,“message”:“我是异常”,“path”:"/feign/hello"}
2019-01-19 20:40:18.116 ERROR 3137 — [io-11111-exec-2] c.c.feign.fallback.SayServiceFallback : 调用失败
可见利用feign组件可以轻松的实现远程接口的调用，监控和日志，配合Sentinel可以轻松实现流量控制和降级等

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