org.springframework.boot
  spring-boot-starter-web
  
    
      org.springframework.boot
      spring-boot-starter-tomcat
    
  


  org.springframework.boot
  spring-boot-starter-undertow

server:
 undertow:
  max-http-post-size: 0
# 設(shè)置IO線程數(shù), 它主要執(zhí)行非阻塞的任務(wù),它們會(huì)負(fù)責(zé)多個(gè)連接, 默認(rèn)設(shè)置每個(gè)CPU核心一個(gè)線程,數(shù)量和CPU 內(nèi)核數(shù)目一樣即可
  io-threads: 4
# 阻塞任務(wù)線程池, 當(dāng)執(zhí)行類似servlet請(qǐng)求阻塞操作, undertow會(huì)從這個(gè)線程池中取得線程,它的值設(shè)置取決于系統(tǒng)的負(fù)載 io-threads*8
  worker-threads: 32
# 以下的配置會(huì)影響buffer,這些buffer會(huì)用于服務(wù)器連接的IO操作,有點(diǎn)類似netty的池化內(nèi)存管理
# 每塊buffer的空間大小,越小的空間被利用越充分
  buffer-size: 1024
# 每個(gè)區(qū)分配的buffer數(shù)量 , 所以pool的大小是buffer-size * buffers-per-region
#  buffers-per-region: 1024 # 這個(gè)參數(shù)不需要寫了
# 是否分配的直接內(nèi)存
  direct-buffers: true

  io.github.openfeign
  feign-httpclient

# feign配置
feign:
 hystrix:
  # 在feign中開啟hystrix功能，默認(rèn)情況下feign不開啟hystrix功能
  enabled: true
 ## 配置httpclient線程池
 httpclient:
  enabled: true
 okhttp:
  enabled: false

import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class HttpPool {

  @Bean
  public HttpClient httpClient(){
    System.out.println("===== Apache httpclient 初始化連接池開始===" );
    // 生成默認(rèn)請(qǐng)求配置
    RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
    // 超時(shí)時(shí)間
    requestConfigBuilder.setSocketTimeout(5 * 1000);
    // 連接時(shí)間
    requestConfigBuilder.setConnectTimeout(5 * 1000);
    RequestConfig defaultRequestConfig = requestConfigBuilder.build();
    // 連接池配置
    // 長連接保持30秒
    final PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.MILLISECONDS);
    // 總連接數(shù)
    pollingConnectionManager.setMaxTotal(1000);
    // 同路由的并發(fā)數(shù)
    pollingConnectionManager.setDefaultMaxPerRoute(100);

    // httpclient 配置
    HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
    // 保持長連接配置，需要在頭添加Keep-Alive
    httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
    httpClientBuilder.setConnectionManager(pollingConnectionManager);
    httpClientBuilder.setDefaultRequestConfig(defaultRequestConfig);
    HttpClient client = httpClientBuilder.build();

    // 啟動(dòng)定時(shí)器，定時(shí)回收過期的連接
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      @Override
      public void run() {
        System.out.println("=====closeIdleConnections===");
        pollingConnectionManager.closeExpiredConnections();
        pollingConnectionManager.closeIdleConnections(5, TimeUnit.SECONDS);
      }
    }, 10 * 1000, 5 * 1000);
    System.out.println("===== Apache httpclient 初始化連接池完畢===");

    return client;
  }
}

  org.springframework.cloud
  spring-cloud-starter-hystrix

# 配置hystrix的參數(shù)
hystrix:
 threadpool:
  # default: 默認(rèn)參數(shù)，作用的所有的hystrix的客戶端,如果需要對(duì)某個(gè)具體的接口，可以寫接口 方法名稱
  default:
   coreSize: 500
 command:
  default:
   fallback:
    # 是否開啟回退方法
    enabled: true
   execution:
    isolation:
     thread:
      timeoutInMilliseconds: 30000 #缺省為1000