需要额外添加http-client依赖
/** * Http连接池 * @Author: stsahana * 摘自https://www.cnblogs.com/zhangzhi19861216/p/8594674.html * @Date: 2019-5-21 17:31 **/ @Configuration public class RestTemplateConfig { @Value("${http-pool.connection-request-timeout}") private int connectionRequestTimeout; @Value("${http-pool.connection-timeout}") private int connectionTimeout; @Value("${http-pool.socket-timeout}") private int socketTimeout; @Value("${http-pool.max-per-route}") private int maxPerRoute; @Value("${http-pool.max-total}") private int maxTotal; @Bean public RestTemplate restTemplate() { return new RestTemplate(httpRequestFactory()); } @Bean public ClientHttpRequestFactory httpRequestFactory() { return new HttpComponentsClientHttpRequestFactory(httpClient()); } @Bean public HttpClient httpClient() { Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create() .register("http", PlainConnectionSocketFactory.getSocketFactory()) .register("https", SSLConnectionSocketFactory.getSocketFactory()) .build(); PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry); //设置整个连接池最大连接数 根据自己的场景决定 connectionManager.setMaxTotal(maxTotal); //路由是对maxTotal的细分 connectionManager.setDefaultMaxPerRoute(maxPerRoute); RequestConfig requestConfig = RequestConfig.custom() .setSocketTimeout(socketTimeout)//服务器返回数据(response)的时间，超过该时间抛出read timeout .setConnectTimeout(connectionTimeout)//连接上服务器(握手成功)的时间，超出该时间抛出connect timeout .setConnectionRequestTimeout(connectionRequestTimeout)//从连接池中获取连接的超时时间，超过该时间未拿到可用连接，会抛出org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from pool .build(); return HttpClientBuilder.create() .setDefaultRequestConfig(requestConfig) .setConnectionManager(connectionManager) .build(); } }