解决feign调用接口不稳定的问题

我就废话不多说了，大家还是直接看代码吧~

Caused by: java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137)
at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153)
at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:282)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:140)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:167)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
at feign.httpclient.ApacheHttpClient.execute(ApacheHttpClient.java:87)
at org.springframework.cloud.netflix.feign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:92)
at org.springframework.cloud.netflix.feign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:77)
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:286)
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:163)
at org.springframework.cloud.netflix.feign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:77)
at org.springframework.cloud.netflix.feign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:48)
at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:109)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287)
at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231)
at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228)
at rx.Observable.unsafeSubscribe(Observable.java:10211)
at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286)
at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
at rx.Observable.unsafeSubscribe(Observable.java:10211)
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94)
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42)
at rx.Observable.unsafeSubscribe(Observable.java:10211)
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127)
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73)
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52)
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79)
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45)
at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276)
at rx.Subscriber.setProducer(Subscriber.java:209)
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138)
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:10307)
at rx.Observable.subscribe(Observable.java:10274)
at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:445)
at rx.observables.BlockingObservable.single(BlockingObservable.java:342)
at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:117)
at org.springframework.cloud.netflix.feign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:63)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:97)
... 117 common frames omitted

feign在调用时，会有不稳定的情况出现，时而出现接口调不通。解决方案如下，复写FeignRibbonClientAutoConfiguration中的HttpClient的配置。代码如下：

import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.NoConnectionReuseStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContexts;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.KeyManagementException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

@Component
public class FeignRibbonHttpClientPoolConfig {

private static final int POOL_MAX_TOTAL = 3000;
 private static final int DEFAULT_MAX_PER_ROUTE = 500;

//validateAfterInactivity 空闲永久连接检查间隔，这个牵扯的还比较多
 //官方推荐使用这个来检查永久链接的可用性，而不推荐每次请求的时候才去检查
 private static final int VALIDATE_AFTER_INACTIVITY = 1000;

@Bean(name = "httpClient", destroyMethod = "close")
 CloseableHttpClient httpClient() throws KeyManagementException {
   return buildCloseableHttpClient();
 }

/**
  * 构建HttpClient连接池
  *
  * @return
  * @throws KeyManagementException
  */
 public CloseableHttpClient buildCloseableHttpClient() throws KeyManagementException {
   SSLContext sslcontext = SSLContexts.createDefault();
   sslcontext.init(null, new TrustManager[]{new TrustAnyManager()}, null); //设置https客户端信任万能证书
   SSLConnectionSocketFactory ssf = new SSLConnectionSocketFactory(sslcontext, NoopHostnameVerifier.INSTANCE);
   //注册请求方式，根据URL自动请求
   Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
       .register("http", PlainConnectionSocketFactory.INSTANCE)
       .register("https", ssf)
       .build();
   //创建Http连接池，单位时间内释放已使用过连接池中的连接
   PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
   connectionManager.setMaxTotal(POOL_MAX_TOTAL);
   connectionManager.setDefaultMaxPerRoute(DEFAULT_MAX_PER_ROUTE);
   connectionManager.setValidateAfterInactivity(VALIDATE_AFTER_INACTIVITY);

return HttpClients.custom()
       .setConnectionManager(connectionManager)
       .setConnectionReuseStrategy(NoConnectionReuseStrategy.INSTANCE)
       .build();
 }

class TrustAnyManager implements X509TrustManager {
   public void checkClientTrusted(X509Certificate[] chain,
                   String authType) throws CertificateException {
   }

public void checkServerTrusted(X509Certificate[] chain,
                   String authType) throws CertificateException {
   }

public X509Certificate[] getAcceptedIssuers() {
     return new X509Certificate[]{};
   }
 }
}

补充知识：springcloud之FeignClient访问微服务接口缓慢

昨天开发FeignClient，想调用微服务。逻辑是A服务调用B服务。AB在同一个局域网内。

经过反复测试，有一个访问缓慢的现象，具体表现为：

程序启动第一次访问初始化1.2秒左右，还可以理解。

但后面访问还是要1.1秒左右（格式化到SSS毫秒打印日志监控的）。

但如果连续访问几次，后面几次又是几十毫秒。过一会再访问，或者换浏览器换post工具请求，又会1.2秒左右。

当时就有点懵逼，这么成熟的工具不可能会这么慢吧，都是一个局域网。

排查了eureka注册中心，发现B服务多注册了一个，IP地址是192开头，经过询问，是一个同事的笔记本连接wifi，wifi自动分配了192开头的ip，笔记本是可以访问注册中心和其他服务的。但其他服务是访问不了这台笔记本的。

也就是说，B服务的一个注册的网络和其他服务是不通的。

但不知道为什么eureka却认为192ip注册是一个正确的微服务，而且一直是UP状态。注册中心的ip肯定是访问不了笔记本192ip的。

手工访问了一下192ip，不会直接提示404或网络错误，而是会加载一会。

这也许导致了FeignClient认为192ip是一台可用的机器。所以第一次请求的时候就去请求192ip，但没返回，到了超时时间，再换B服务的其他地址，就导致了耗时。

让同事把服务停了，再次调用服务，速度就很快了。

总结：个别机器IP不通，会导致FeignClient调用微服务缓慢。而且在eureka中心中是UP状态，没有错误提示。

需要注意网络互通情况。

来源：https://blog.csdn.net/flysun3344/article/details/81117403