1.使用feign进行服务间的调用
spring boot2X整合nacos一使用Feign实现服务调用
2.开启gzip压缩
Feign支持对请求与响应的压缩，以提高通信效率，需要在服务消费者配置文件开启压缩支持和压缩文件的类型
添加配置
feign.compression.request.enabled=true feign.compression.response.enabled=true feign.compression.request.mime-types=text/xml,application/xml,application/json feign.compression.request.min-request-size=2048
3.开启日志
配置
logging.level.com.xyz.comsumer.feign.RemoteHelloService=debug
添加FeignLogConfig类
packagecom.xyz.comsumer.configure; importfeign.Logger; importorg.springframework.context.annotation.Bean; importorg.springframework.context.annotation.Configuration; @Configuration public classFeignLogConfig { @Bean Logger.Level feignLogger(){ returnLogger.Level.FULL; } }
输出
2019-12-07 23:23:03.630 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] <--- HTTP/1.1 200 (671ms)
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] content-length: 14
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] content-type: text/plain;charset=UTF-8
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] date: Sat, 07 Dec 2019 15:23:03 GMT
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Origin
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Access-Control-Request-Method
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] vary: Access-Control-Request-Headers
2019-12-07 23:23:03.631 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello]
2019-12-07 23:23:03.632 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] hello,provider
2019-12-07 23:23:03.632 DEBUG 2668 --- [vice-provider-1] c.xyz.comsumer.feign.RemoteHelloService : [RemoteHelloService#hello] <--- END HTTP (14-byte body)
说明：
Feign日志记录只能响应DEBUG日志级别
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。
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-okhttp</artifactId>
</dependency>修改配置
禁用默认的http，启用okhttp
feign.okhttp.enabled=true feign.httpclient.enabled=false
添加FeignOkHttpConfig类
package com.xyz.comsumer.configure; import feign.Feign; import okhttp3.ConnectionPool; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.AutoConfigureBefore; import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; import org.springframework.cloud.openfeign.FeignAutoConfiguration; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import java.util.concurrent.TimeUnit; @Configuration @ConditionalOnClass(Feign.class) @AutoConfigureBefore(FeignAutoConfiguration.class) public classFeignOkHttpConfig { @Bean publicokhttp3.OkHttpClient okHttpClient(){ return newokhttp3.OkHttpClient.Builder() .readTimeout(10, TimeUnit.SECONDS) .connectTimeout(10, TimeUnit.SECONDS) .writeTimeout(20, TimeUnit.SECONDS) .retryOnConnectionFailure(true) .connectionPool(newConnectionPool()) .build(); } }
5.超时设置
Feign调用服务的默认时长是1秒钟
hystrix的超时时间
hystrix.command.default.execution.timeout.enabled=true hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=10000
说明：
hystrix.command.default.execution.timeout.enabled 执行是否启用超时，默认启用true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds 命令执行超时时间，默认1000ms
常用的配置还有
hystrix.command.default.execution.isolation.strategy 隔离策略，默认是Thread, 可选THREAD｜SEMAPHORE，建议选择SEMAPHORE
Feign 的负载均衡底层用的就是Ribbon
ribbon的超时时间ribbon.ReadTimeout=10000 ribbon.ConnectTimeout=10000
6.使用hystrix进行熔断、降级处理
feign启用hystrix，才能熔断、降级
feign.hystrix.enabled=true
hystrix服务降级处理
RemoteHelloServiceFallbackImpl
packagecom.xyz.comsumer.feign.fallback; importcom.xyz.comsumer.feign.RemoteHelloService; importorg.slf4j.Logger; importorg.slf4j.LoggerFactory; importorg.springframework.stereotype.Component; @Component public class RemoteHelloServiceFallbackImpl implementsRemoteHelloService { private final Logger logger = LoggerFactory.getLogger(RemoteHelloServiceFallbackImpl.class); @Override publicString hello() { logger.error("feign 查询信息失败:{}"); return null; } }