Question

我可以为HttpClientBuilder设置某些属性（例如maxConnTotal），如下所示：

YAML

http.client.max-conn-total: 10

的java

@Bean
@ConfigurationProperties(prefix = "http.client")
public HttpClientBuilder httpClientBuilder() {
  return HttpClientBuilder.create();
}

我希望还有一种设置ConnectionKeepAliveStrategy的方法，因为我需要使用自定义的方法。

理想情况下，我可以将ConnectionKeepAliveStrategy定义为常规bean，如果缺少它，只会使http客户端构建器保持不变。

Answer 1

没有意识到这很容易......

我只需要在配置中添加以下内容：

@Autowired(required = false)
public void customizeHttpClientBuilder(HttpClientBuilder httpClientBuilder, ConnectionKeepAliveStrategy keepAliveStrategy) {
  httpClientBuilder.setKeepAliveStrategy(keepAliveStrategy);
}

Answer 2

使用java.util.Optional更简单的方法：

@Bean
@ConfigurationProperties(prefix = "http.client")
public HttpClientBuilder httpClientBuilder(Optional<ConnectionKeepAliveStrategy> keepAliveStrategy) {
    HttpClientBuilder builder = HttpClientBuilder.create();
    keepAliveStrategy.ifPresent(builder::setKeepAliveStrategy);
    return builder;
}

通过@ConfigurationProperties为HttpClientBuilder设置ConnectionKeepAliveStrategy

2 个答案: