RestTemplate优化

最新推荐文章于 2025-05-31 09:41:21 发布

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本文详细介绍SpringCloud中RestTemplate的高级配置方法，包括连接池的管理、连接和读取超时时间的设定、重试策略的实现，以及如何通过自定义HttpComponentsClientHttpRequestFactory来提升HTTP请求的稳定性和效率。

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附：SpringCloud之系列汇总跳转地址

RestTemplateConfig

package com.newland.iot.config;

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
	@LoadBalanced
	public 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-Alive
		httpClientBuilder
				.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
		HttpClient httpClient = httpClientBuilder.build();
		// httpClient连接底层配置clientHttpRequestFactory
		HttpComponentsClientHttpRequestFactory clientHttpRequestFactory =
		new HttpComponentsClientHttpRequestFactory(httpClient);
		clientHttpRequestFactory.setReadTimeout(5000);// ms
		clientHttpRequestFactory.setConnectTimeout(15000);//
		return clientHttpRequestFactory;
	}
}

附：SpringCloud之系列汇总跳转地址