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我坚持使用此代理配置。我正在使用 RestTemplate，我需要为 RestTemplate 进行的所有调用应用代理。我正在尝试使用 JVM 参数，因为我确实需要本地开发盒的代理。

代码：

import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

public class RestTemplateProxy {

    public static void main(String...strings) {
        System.out.println(System.getProperties());
        PoolingHttpClientConnectionManager poolingHttpClientConnectionManager = new PoolingHttpClientConnectionManager();

        RequestConfig requestConfig = RequestConfig.custom()
                .setSocketTimeout(5000)
                .setConnectTimeout(2000)
                .build();
        HttpClient defaultHttpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).setConnectionManager(poolingHttpClientConnectionManager)
                        .build();

        poolingHttpClientConnectionManager.setMaxTotal(200);
        poolingHttpClientConnectionManager.setDefaultMaxPerRoute(200);
        ClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(defaultHttpClient);

        RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory);

        String res = restTemplate.getForObject("API URL.....", String.class);
        System.out.println(res);

    }

}

如何验证：

-Dhttp.proxyHost=localhost -Dhttps.proxyHost=localhost -Dhttp.proxyPort=1212 -Dhttps.proxyPort=1212

在非代理环境中，我使用代理主机到 localhost -> 它应该无法连接。相反，它绕过配置并尝试访问服务并获得响应。

系统参数打印：

https.proxyHost=localhost, http.proxyPort=1212, http.proxyHost=localhost, https.proxyPort=1212
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1 回答 1

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要使 Apache HttpClient 使用通过 VM args 传递的代理设置，您必须.useSystemProperties()在构建 HTTP 客户端时调用。

HttpClient defaultHttpClient = HttpClientBuilder.create()
.useSystemProperties()
.setDefaultRequestConfig(requestConfig)
.setConnectionManager(poolingHttpClientConnectionManager).build();
于 2018-05-25T13:37:46.363 回答