解决Feign切换client到okhttp无法生效的坑(出现原因说明)

<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependencyManagement>
 <dependencies>
 <dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-dependencies</artifactId>
 <version>${自行选择适合项目的版本}</version>
 <type>pom</type>
 <scope>import</scope>
 </dependency>
 </dependencies>
</dependencyManagement>

@SpringBootApplication
@EnableFeignClients
public class Application {
 public static void main(String[] args) {
 SpringApplication.run(Application.class, args);
 }
}

@Configuration
public class FeignConfig {
 @Bean
 public Contract feignContract() {
 return new feign.Contract.Default();
 }
}

@FeignClient(name = "accessPlatform", url = "${url.access-platform}")
public interface AccessPlatformFeignClient {
 @RequestLine("GET /access-platform/resource")
 List<AccessResource> queryResourceList(@QueryMap Map<String, Object> query);
}

 <dependency>
 <groupId>io.github.openfeign</groupId>
 <artifactId>feign-okhttp</artifactId>
 <version>${feign-okhttp.version}</version>
</dependency>

@Configuration
@ConditionalOnClass(Feign.class)
@AutoConfigureBefore(FeignAutoConfiguration.class)
public class FeignConfig {
 // 注入feignContract
 @Bean
 public Contract feignContract() {
 return new feign.Contract.Default();
 }
 
 // 注入自定义的okHttpClient
 @Bean
 public okhttp3.OkHttpClient okHttpClient(){
 return new okhttp3.OkHttpClient.Builder()
  .readTimeout(60, TimeUnit.SECONDS)
  .connectTimeout(60, TimeUnit.SECONDS) 
  .writeTimeout(120, TimeUnit.SECONDS) 
  .connectionPool(new ConnectionPool())
  .build();
 }
}

# application.yml
feign:
 okhttp:
 enabled: true

logging:
 level:
 root: debug

@Configuration
@ConditionalOnClass({Feign.class})
@EnableConfigurationProperties({FeignClientProperties.class, FeignHttpClientProperties.class})
public class FeignAutoConfiguration {
 // .....其他的配置
 @Configuration
 @ConditionalOnClass({OkHttpClient.class})
 @ConditionalOnMissingClass({"com.netflix.loadbalancer.ILoadBalancer"})
 @ConditionalOnMissingBean({okhttp3.OkHttpClient.class})
 @ConditionalOnProperty({"feign.okhttp.enabled"})
 protected static class OkHttpFeignConfiguration {
 // ...okhttp的配置
 }
 
 // .....其他的配置
}

@Configuration
@ConditionalOnClass(Feign.class)
@AutoConfigureAfter(FeignAutoConfiguration.class)
public class FeignConfig {
// private okhttp3.OkHttpClient okHttpClient;
 @Bean
 public Contract feignContract() {
 return new feign.Contract.Default();
 }
 @Bean
 @ConditionalOnMissingBean({Client.class})
 public Client feignClient(okhttp3.OkHttpClient client) {
 return new feign.okhttp.OkHttpClient(client);
 }
 @Bean
 @ConditionalOnMissingBean({ConnectionPool.class})
 public ConnectionPool httpClientConnectionPool(FeignHttpClientProperties httpClientProperties, OkHttpClientConnectionPoolFactory connectionPoolFactory) {
 Integer maxTotalConnections = httpClientProperties.getMaxConnections();
 Long timeToLive = httpClientProperties.getTimeToLive();
 TimeUnit ttlUnit = httpClientProperties.getTimeToLiveUnit();
 return connectionPoolFactory.create(maxTotalConnections, timeToLive, ttlUnit);
 }
 @Bean
 public OkHttpClient client(OkHttpClientFactory httpClientFactory, ConnectionPool connectionPool, FeignHttpClientProperties httpClientProperties) {
 Boolean followRedirects = httpClientProperties.isFollowRedirects();
 Integer connectTimeout = httpClientProperties.getConnectionTimeout();
 Boolean disableSslValidation = httpClientProperties.isDisableSslValidation();
 return httpClientFactory.createBuilder(disableSslValidation)
  .connectTimeout((long)connectTimeout, TimeUnit.MILLISECONDS)
  .followRedirects(followRedirects)
  .connectionPool(connectionPool)
  .addInterceptor(new OkHttpLogInterceptor()) // 自定义请求日志拦截器
  .build();
 }
}