增加类：RestTemplateConfig

import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import java.util.concurrent.TimeUnit;
@Configuration
public class RestTemplateConfig {@Bean@LoadBalancedpublic RestTemplate restTemplate() {RestTemplate restTemplate = new RestTemplate(RestTemplateConfig.newClientHttpRequestFactory());return restTemplate;}/*** 自定义RestTemplate配置* 1、设置最大连接数* 2、设置路由并发数* 3、设置重试次数* @author Hux* @return*/public static ClientHttpRequestFactory newClientHttpRequestFactory() {// 长连接保持时长30秒PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.SECONDS);// 最大连接数pollingConnectionManager.setMaxTotal(3000);// 单路由的并发数pollingConnectionManager.setDefaultMaxPerRoute(100);HttpClientBuilder httpClientBuilder = HttpClients.custom();httpClientBuilder.setConnectionManager(pollingConnectionManager);// 重试次数2次，并开启httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(2,true));// 保持长连接配置，需要在头添加Keep-AlivehttpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());HttpClient httpClient = httpClientBuilder.build();// httpClient连接底层配置clientHttpRequestFactoryHttpComponentsClientHttpRequestFactory clientHttpRequestFactory =new HttpComponentsClientHttpRequestFactory(httpClient);clientHttpRequestFactory.setReadTimeout(5000);// msclientHttpRequestFactory.setConnectTimeout(15000);//return clientHttpRequestFactory;}
}