SpringCloud Open feign 使用okhttp 优化

        
            org.springframework.boot
            spring-boot-starter-web
            
                
                
                    spring-boot-starter-tomcat
                    org.springframework.boot
                
            
        
        
            org.springframework.boot
            spring-boot-starter-aop
        
        
        
            org.springframework.boot
            spring-boot-starter-undertow
        
        
        
            io.github.openfeign
            feign-okhttp
        

配置pom,容器使用undertow，引入feign-okhttp

feign: 
# Okhttp参数配置
  httpclient:
    enabled: false
  okhttp:
    enabled: true
    max-connections: 200 # 默认值
    max-connections-per-route: 50 # 默认值

application.yml文件配置okhttp参数

import feign.Feign;
import okhttp3.ConnectionPool;
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()
                //设置连接超时
                .connectTimeout(60, TimeUnit.SECONDS)
                //设置读超时
                .readTimeout(60, TimeUnit.SECONDS)
                //设置写超时
                .writeTimeout(120,TimeUnit.SECONDS)
                //是否自动重连
                .retryOnConnectionFailure(true)
                .connectionPool(new ConnectionPool())
                .addInterceptor(new OkHttpLogInterceptor())
                //构建OkHttpClient对象
                .build();
    }
}

创建FeignOkHttpConfig类文件

import lombok.extern.log4j.Log4j2;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

import java.io.IOException;

@Log4j2
public class OkHttpLogInterceptor implements Interceptor {


    @Override
    public Response intercept(Interceptor.Chain chain) throws IOException {
        //这个chain里面包含了request和response，所以你要什么都可以从这里拿
        Request request = chain.request();

        long t1 = System.nanoTime();//请求发起的时间
        log.info(String.format("发送请求 %s on %s%n%s",
                request.url(), chain.connection(), request.headers()));

        Response response = chain.proceed(request);

        long t2 = System.nanoTime();//收到响应的时间

        //这里不能直接使用response.body().string()的方式输出日志
        //因为response.body().string()之后，response中的流会被关闭，程序会报错，我们需要创建出一
        //个新的response给应用层处理
        ResponseBody responseBody = response.peekBody(1024 * 1024);

        log.info(String.format("接收响应: [%s] %n返回json:【%s】 %.1fms%n%s",
                response.request().url(),
                responseBody.string(),
                (t2 - t1) / 1e6d,
                response.headers()));

        return response;
    }
}

创建OkHttpLogInterceptor日志拦截文件

注意FeignOkHttpConfig中添加
 @Bean
    public Contract feignContract() {
        return new feign.Contract.Default();
    }
    
   feigin请求的@PostMapping @GetMapping等会不受支持
   

图一，Feign通过jdk中的HttpURLConnection
图二，Feign使用okhttp请求