出现错误：RestTemplate POST 请求异常：ResourceAccessException I/O error on POST request for Connection timed out (Connection timed out)

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报错信息

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org.springframework.web.client.ResourceAccessException: I/O error on POST request for "https://oms.decathlon.com.cn/oms-service/api/auth": Connection timed out (Connection timed out); nested exception is java.net.ConnectException: Connection timed out (Connection timed out)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:748)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:674)
	at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:418)
	at com.decathlon.sfc.order.bff.core.apiclient.credential.TokenCredential.getToken(TokenCredential.java:121)
	at com.decathlon.sfc.order.bff.core.apiclient.JwtApiClientExecutor.execute(JwtApiClientExecutor.java:46)
	at com.decathlon.sfc.order.bff.core.apiclient.JwtApiClientExecutor$$FastClassBySpringCGLIB$$6e21617c.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:100)
	at com.decathlon.sfc.order.bff.core.aspect.ElkLoggingAspect.aroundAdvice(ElkLoggingAspect.java:42)
	at jdk.internal.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
	at com.decathlon.sfc.order.bff.core.apiclient.JwtApiClientExecutor$$EnhancerBySpringCGLIB$$8bf57992.execute(<generated>)
	at com.decathlon.sfc.order.bff.core.entity.output.ApiOutput.execute(ApiOutput.java:80)
	at com.decathlon.sfc.order.bff.core.entity.task.Task.executeOutput(Task.java:133)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
	at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
	at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
	at java.base/java.net.Socket.connect(Socket.java:609)
	at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:289)
	at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
	at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
	at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:265)
	at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:372)
	at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
	at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
	at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
	at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
	at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:168)
	at org.springframework.http.client.SimpleBufferingClientHttpRequest.executeInternal(SimpleBufferingClientHttpRequest.java:76)
	at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
	at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:739)
	... 30 more

问题分析

可能是发送的途中，网络抖动，也就是说：网络不稳定。但是这种几率一般很小。

解决方案

下面仅为我自己的解决方案，

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package com.decathlon.sfc.order.bff.core.util;

import org.springframework.http.MediaType;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;

/**
 * RestTemplate 工具类
 *
 * @author 陶攀峰
 * @version 1.0
 * @date 2021-01-12 10:24
 */
public class RestTemplateUtil {

    private RestTemplateUtil() {
    }


    /**
     * 自定义 RestTemplate，使之支持多种类型
     *
     * @author 陶攀峰
     * @date 2020-11-10 17:58
     */
    public static RestTemplate diyRestTemplate() {
        // 防止超时报错：ConnectException: Connection timed out (Connection timed out)
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
        requestFactory.setConnectTimeout(10 * 1000);
        requestFactory.setReadTimeout(10 * 1000);

        RestTemplate restTemplate = new RestTemplate(requestFactory);
        MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        mappingJackson2HttpMessageConverter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON, MediaType.APPLICATION_OCTET_STREAM, MediaType.TEXT_HTML, MediaType.TEXT_PLAIN));
        restTemplate.getMessageConverters().add(mappingJackson2HttpMessageConverter);
        return restTemplate;
    }
}

在这里插入图片描述