RestTemplate 添加请求池及相关设置_httpcomponentsclienthttprequestfactory

目前（4.2.6.RELEASE）的 RestTemplate 主要有四种 ClientHttpRequestFactory 的实现，它们分别是：

基于 JDK HttpURLConnection 的 SimpleClientHttpRequestFactory
基于 Apache HttpComponents Client 的 HttpComponentsClientHttpRequestFactory
基于 OkHttp 2（OkHttp 最新版本为 3，有较大改动，包名有变动，不和老版本兼容）的 OkHttpClientHttpRequestFactory
基于 Netty4 的 Netty4ClientHttpRequestFactory
另外，还有用于提供拦截器功能的 InterceptingClientHttpRequestFactory。
具体代码如下：

import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.client.RestTemplateBuilder;
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 javax.annotation.Resource;

/**

• @description: restTemplate配置(增加连接池)

• @fileName: RestTemplateConfig.java

• @author: Sure

• @createAt: 2022/2/25 14:12

• @updateBy: Sure

• @remark:
  */
  @Configuration
  public class RestTemplateConfig {

  /**

  • 接口调用类
    */
    @Resource
    private RestTemplateBuilder restTemplateBuilder;

  /**

  • httpComponentsClientHttpRequestFactory连接超时时间
    */
    @Value("${http.connect.timeout}")
    private int httpConnectTimeOut;

  /**

  • httpComponentsClientHttpRequestFactory读取数据超时时间
    */
    @Value("${http.read.timeout}")
    private int httpReadTimeOut;

  /**

  • 服务器返回数据(response)的时间，超过该时间抛出read timeout
    */
    @Value("${http.pool.socket.timeout}")
    private int poolSocketTimeOut;

  /**

  • 从连接池中获取连接的超时时间
    */
    @Value("${http.pool.request.timeout}")
    private int poolRequestTimeOut;

  /**

  • 从连接池中获取连接的超时时间
    */
    @Value("${http.pool.connect.timeout}")
    private int poolConnectTimeOut;

  /**

  • 从连接池中获取连接的超时时间
    */
    @Value("${http.pool.connect.maxsize}")
    private int poolMaxSize;

  /**

  • 路由
    */
    @Value("${http.pool.connect.maxperroute}")
    private int poolMaxPerRoute;

  /**

  • 注入调用三方接口使用的RestTemplate
  • @return RestTemplate
    */
    @Bean
    public RestTemplate thirdReqRestTemplate() {
    //暂时先通过build获取 new出来的sMessageConverters缺少参数
    RestTemplate buildTemplate = restTemplateBuilder.build();
    buildTemplate.setRequestFactory(httpRequestFactory());
    return buildTemplate;
    }

  /**

  • 定义ClientHttpRequestFactory
  • @return ClientHttpRequestFactory
    */
    @Bean
    public ClientHttpRequestFactory httpRequestFactory() {
    HttpComponentsClientHttpRequestFactory httpComponentsClientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient());
    httpComponentsClientHttpRequestFactory.setConnectTimeout(httpConnectTimeOut);
    httpComponentsClientHttpRequestFactory.setReadTimeout(httpReadTimeOut);
    return httpComponentsClientHttpRequestFactory;
    }

  /**

  • 设置一种http响应客户端
  • @return
    */
    @Bean
    public HttpClient httpClient() {
    Registry registry = RegistryBuilder.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
    connectionManager.setMaxTotal(poolMaxSize);
    //路由是对maxTotal的细分
    connectionManager.setDefaultMaxPerRoute(poolMaxPerRoute);
    RequestConfig requestConfig = RequestConfig.custom()
    // 服务器返回数据(response)的时间，超过该时间抛出read timeout
    .setSocketTimeout(poolSocketTimeOut)
    // 连接上服务器(握手成功)的时间，超出该时间抛出connect timeout
    .setConnectTimeout(poolConnectTimeOut)
    // 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
    .setConnectionRequestTimeout(poolRequestTimeOut)
    .build();
    return HttpClientBuilder.create()
    .setDefaultRequestConfig(requestConfig)
    .setConnectionManager(connectionManager)
    .build();
    }

}