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Spring Cloud Feign高級(jí)應(yīng)用實(shí)例詳解

更新時(shí)間：2019年12月10日 14:27:54 投稿：yaominghui

這篇文章主要介紹了Spring Cloud Feign高級(jí)應(yīng)用實(shí)例詳解,文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

1.使用feign進(jìn)行服務(wù)間的調(diào)用

Spring boot2X Consul如何使用Feign實(shí)現(xiàn)服務(wù)調(diào)用

2.開(kāi)啟gzip壓縮

Feign支持對(duì)請(qǐng)求與響應(yīng)的壓縮，以提高通信效率，需要在服務(wù)消費(fèi)者配置文件開(kāi)啟壓縮支持和壓縮文件的類(lèi)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.開(kāi)啟日志

配置

logging.level.com.xyz.comsumer.feign.RemoteHelloService=debug

添加FeignLogConfig類(lèi)

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;
  }
}

輸出

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)

說(shuō)明：

　　Feign日志記錄只能響應(yīng)DEBUG日志級(jí)別

對(duì)每一個(gè)Feign客戶(hù)端，可以配置一個(gè)Logger.Level對(duì)象，通過(guò)該對(duì)象控制日志輸出內(nèi)容。

Logger.Level有如下幾種選擇：

NONE, 不記錄日志 (默認(rèn))。

BASIC, 只記錄請(qǐng)求方法和URL以及響應(yīng)狀態(tài)代碼和執(zhí)行時(shí)間。

HEADERS, 記錄請(qǐng)求和應(yīng)答的頭的基本信息。

FULL, 記錄請(qǐng)求和響應(yīng)的頭信息，正文和元數(shù)據(jù)。

4.替換JDK默認(rèn)的URLConnection為okhttp

在默認(rèn)情況下 spring cloud feign在進(jìn)行各個(gè)子服務(wù)之間的調(diào)用時(shí)，http組件使用的是jdk的HttpURLConnection

服務(wù)之間調(diào)用使用的HttpURLConnection，效率非常低

為了提高效率，可以通過(guò)連接池提高效率

使用okhttp，能提高qps，因?yàn)閛khttp有連接池和超時(shí)時(shí)間進(jìn)行調(diào)優(yōu)

添加依賴(lài)

<dependency>
  <groupId>io.github.openfeign</groupId>
  <artifactId>feign-okhttp</artifactId>
</dependency>

修改配置

禁用默認(rèn)的http，啟用okhttp

feign.okhttp.enabled=true
feign.httpclient.enabled=false

添加FeignOkHttpConfig類(lèi)

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.超時(shí)設(shè)置

Feign調(diào)用服務(wù)的默認(rèn)時(shí)長(zhǎng)是1秒鐘

hystrix的超時(shí)時(shí)間

hystrix.command.default.execution.timeout.enabled=true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=10000

說(shuō)明：

　　hystrix.command.default.execution.timeout.enabled 執(zhí)行是否啟用超時(shí)，默認(rèn)啟用true

　　hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds 命令執(zhí)行超時(shí)時(shí)間，默認(rèn)1000ms

　　常用的配置還有

　　　　hystrix.command.default.execution.isolation.strategy 隔離策略，默認(rèn)是Thread, 可選THREAD｜SEMAPHORE，建議選擇SEMAPHORE

Feign 的負(fù)載均衡底層用的就是 Ribbon

ribbon的超時(shí)時(shí)間

ribbon.ReadTimeout=10000
ribbon.ConnectTimeout=10000

6.使用hystrix進(jìn)行熔斷、降級(jí)處理

feign啟用hystrix，才能熔斷、降級(jí)

feign.hystrix.enabled=true

hystrix服務(wù)降級(jí)處理

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 查詢(xún)信息失敗:{}");
    return null;
  }
}

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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