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小编给大家分享一下Spring Cloud Feign高级应用的示例分析,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
1.使用feign进行服务间的调用
Spring boot2X Consul如何使用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
package com.xyz.comsumer.configure; import feign.Logger; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class FeignLogConfig { @Bean Logger.Level feignLogger(){ return Logger.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。
4.替换JDK默认的URLConnection为okhttp
在默认情况下 spring cloud feign在进行各个子服务之间的调用时,http组件使用的是jdk的HttpURLConnection
服务之间调用使用的HttpURLConnection,效率非常低
为了提高效率,可以通过连接池提高效率
使用okhttp,能提高qps,因为okhttp有连接池和超时时间进行调优
添加依赖
<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 class FeignOkHttpConfig { @Bean public okhttp3.OkHttpClient okHttpClient(){ return new okhttp3.OkHttpClient.Builder() .readTimeout(10, TimeUnit.SECONDS) .connectTimeout(10, TimeUnit.SECONDS) .writeTimeout(20, TimeUnit.SECONDS) .retryOnConnectionFailure(true) .connectionPool(new ConnectionPool()) .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
package com.xyz.comsumer.feign.fallback; import com.xyz.comsumer.feign.RemoteHelloService; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; @Component public class RemoteHelloServiceFallbackImpl implements RemoteHelloService { private final Logger logger = LoggerFactory.getLogger(RemoteHelloServiceFallbackImpl.class); @Override public String hello() { logger.error("feign 查询信息失败:{}"); return null; } }
以上是“Spring Cloud Feign高级应用的示例分析”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注亿速云行业资讯频道!
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