spring cloud使用feignClient调restful微服务报错原因追踪

zhouxinxi

第一步：看现象
最初报错：
feign.RetryableException: Connection refused: connect executing GET
http://data-service/authorityInnerRest/query
at feign.FeignException.errorExecuting(FeignException.java:67) ~[feign-core-9.5.0.jar:na]
其中：data-service为项目在注册中心eureka中注册的服务名；

第二步：看本质
从以上错误来看，看不出任何问题，思路全无，因此我使用一个自己写的一个feign客户端工具类
去请求restful,可以看到更底层的错误如下：
feign.RetryableException: Connection refused: connect executing POST http://windows10.microdone.cn:8088/authorityInnerRest/query
其中：windows10.microdone.cn为本机host文件的一个域名地址
第三步：分析
从第二步验证来看，已经跳出注册中心，拿到最原始的请求地址了，因此我用了2种方法来测试定位问题点：
  1. 在浏览器中直接访问地址http://windows10.microdone.cn:8088/authorityInnerRest/query
     结果：welcome,data-service,i'm ok!  ——可以看出，调用成功，如下图：



C:/Users/ibm/AppData/Local/YNote/data/qq006993EEDDB5209621D7774CC261E69F/0dce667c569b40e48257354e2ad9b54c/clipboard.png
2.使用postman工具来调用http://windows10.microdone.cn:8088/authorityInnerRest/query
    结果：
        Could not get any response
          There was an error connecting to http://windows10.microdone.cn:8088/authorityInnerRest/query.
  ——调用失败；如下图：

C:/Users/ibm/AppData/Local/YNote/data/qq006993EEDDB5209621D7774CC261E69F/1949b7eaec874368a47828d486e43b21/clipboard.png
第四步：通过第三步的测试结果，本人有点蒙圈了，只能硬着头皮继续试：
cmd>> telnet  windows10.microdone.cn 8088
结果：可以连接成功

第5步：终极大招
           经过前面四步的分析结果，基本可以确定，应该是域名的问题，因此我把目标
转向本机host文件。全文搜索windows10.microdone.cn，奇迹出现了：
搜索windows10.microdone.cn竟然出现了2条记录：
10.206.19.122 windows10.microdone.cn#***********本机回路*************
10.206.19.119 windows10.microdone.cn（这一条是目前本机使用的ip）
如图：

C:/Users/ibm/AppData/Local/YNote/data/qq006993EEDDB5209621D7774CC261E69F/bd2fc2e2f1f5438fa414efb6c556733f/clipboard.png
日了鬼，本人从来没加过这些，不知是哪个软件吃饱了撑的加了这些域名映射。（后面把这个罪魁祸首揪出来再告诉大家）
果断删除：10.206.19.122 windows10.microdone.cn#***********本机回路*************

继续测试：果断成功，收摊。

************************************************************************************************************
详细报错如下：
feign.RetryableException: Connection refused: connect executing POST http://windows10.microdone.cn:8088/authorityInnerRest/query
        at feign.FeignException.errorExecuting(FeignException.java:67) ~[feign-core-9.5.0.jar:na]
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:104) ~[feign-core-9.5.0.jar:na]
        at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) ~[feign-core-9.5.0.jar:na]
        at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.5.0.jar:na]
        at com.sun.proxy.$Proxy178.query(Unknown Source) ~[na:na]
        at egov.common.login.security.SecurityInvocationSecurityMetadataSource.loadResourceDefine(SecurityInvocationSecurityMetadataSource.java:67) ~[classes/:na]
        at egov.common.login.security.SecurityInvocationSecurityMetadataSource.getAttributes(SecurityInvocationSecurityMetadataSource.java:87) ~[classes/:na]
        at org.springframework.security.access.intercept.AbstractSecurityInterceptor.beforeInvocation(AbstractSecurityInterceptor.java:197) ~[spring-security-core-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at egov.common.login.security.SecurityFilterSecurityInterceptor.invoke(SecurityFilterSecurityInterceptor.java:80) ~[classes/:na]
        at egov.common.login.security.SecurityFilterSecurityInterceptor.doFilter(SecurityFilterSecurityInterceptor.java:59) ~[classes/:na]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) ~[spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167) ~[spring-session-1.3.1.RELEASE.jar:na]
        at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80) ~[spring-session-1.3.1.RELEASE.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_31]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_31]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.23.jar:8.5.23]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_31]
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_31]
        at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_31]
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) ~[na:1.8.0_31]
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_31]
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_31]
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_31]
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_31]
        at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_31]
        at sun.net.NetworkClient.doConnect(NetworkClient.java:175) ~[na:1.8.0_31]
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) ~[na:1.8.0_31]
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) ~[na:1.8.0_31]
        at sun.net.www.http.HttpClient.<init>(HttpClient.java:211) ~[na:1.8.0_31]
        at sun.net.www.http.HttpClient.New(HttpClient.java:308) ~[na:1.8.0_31]
        at sun.net.www.http.HttpClient.New(HttpClient.java:326) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1168) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:932) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1282) ~[na:1.8.0_31]
        at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1257) ~[na:1.8.0_31]
        at feign.Client$Default.convertAndSend(Client.java:133) ~[feign-core-9.5.0.jar:na]
        at feign.Client$Default.execute(Client.java:73) ~[feign-core-9.5.0.jar:na]
        at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:97) ~[feign-core-9.5.0.jar:na]
        ... 73 common frames omitted

feign客户端工具类:

import java.util.HashMap;
import java.util.Map;

import org.apache.poi.ss.formula.functions.T;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.client.RestTemplate;

import egov.common.utils.factory.SpringBeanNewUtil;
import feign.Feign;
import feign.jackson.JacksonDecoder;
import feign.jackson.JacksonEncoder;

/**
* @author ibm
*
*/
public class FeignClientProxyUtil {
        public static <T> T getClientByServiceId(String serviceId,Class<T> t) throws Exception{
                ServiceInstance instance = ((LoadBalancerClient)SpringBeanNewUtil.getBean("loadBalancerClient")).choose(serviceId);
                if (instance != null) {
                        String feignClientURL =  instance.getUri().toString();
                        T client = Feign.builder()
                                        .encoder(new JacksonEncoder())
                            .decoder(new JacksonDecoder())
                                    .target(t,feignClientURL);
                                return client;
            }else{
                    throw new Exception("FeignClientProxyUtil通过微服务名称未找到可用微服务:"+serviceId);
            }
        }
}

业务客户端调用代码：
AuthorityClient2 client = null ;
            try {
                     client = FeignClientProxyUtil.getClientByServiceId("data-service", AuthorityClient2.class);
                } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
        Page<Authority>  authList = client.query(new AuthorityQuery());

feignClient2接口类：
package egov.mana.data.authority.client;

import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;

import egov.common.base.model.Page;
import egov.mana.data.authority.model.Authority;
import egov.mana.data.authority.model.AuthorityQuery;
import feign.Headers;
import feign.RequestLine;

@Component
//@FeignClient(name = "data-service")
//@RequestMapping(value = "/authorityInnerRest")

public interface AuthorityClient2 {

        @RequestLine("GET /authorityInnerRest/get/{param}")
        Authority get(@PathVariable("param") Long id) throws Exception ;

        @Headers({"Content-Type: application/json","Accept: application/json"})
        @RequestLine("POST /authorityInnerRest/query")
        Page<Authority> query(@RequestBody AuthorityQuery query);


}