将代理与 HttpComponentsClientHttpRequestFactory 和 RestTemplate 一起使用

Question

谁能指导我如何配置 HttpComponentsClientHttpRequestFactory 以使用代理服务器。

我看到的所有例子都在使用SimpleClientHttpRequestFactory。

Answer 1

如果您不介意使用 Apache Http Client，它不是很复杂，有两种可能性：

如果所有目标的单个代理对您来说就足够了：

HttpComponentsClientHttpRequestFactory clientHttpRequestFactory 
    = new HttpComponentsClientHttpRequestFactory(
        HttpClientBuilder.create()
                .setProxy(new HttpHost("myproxy.com", 80, "http"))
                .build());
restTemplate = new RestTemplate(clientHttpRequestFactory);

或者如果你想为不同的目标 URI、模式等使用不同的代理，你可以使用 HttpRoutePlanner 和自定义 ProxySelector:

HttpRoutePlanner routePlanner = new SystemDefaultRoutePlanner(new MyProxySelector());

HttpComponentsClientHttpRequestFactory clientHttpRequestFactory 
    = new HttpComponentsClientHttpRequestFactory(
        HttpClientBuilder.create()
            .setRoutePlanner(routePlanner)
            .build());
restTemplate = new RestTemplate(clientHttpRequestFactory);

示例代理选择器：MyProxySelector.java:

package hello;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Proxy.Type;
import java.net.ProxySelector;
import java.net.SocketAddress;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

public class MyProxySelector extends ProxySelector {

    ProxySelector defaultproxySelector = ProxySelector.getDefault();

    ArrayList<Proxy> noProxy = new ArrayList<Proxy>();
    ArrayList<Proxy> secureProxy = new ArrayList<Proxy>();
    ArrayList<Proxy> sociaMediaProxy = new ArrayList<Proxy>();

    public MyProxySelector(){

        noProxy.add(Proxy.NO_PROXY);

        secureProxy.add(new Proxy(Type.HTTP, new InetSocketAddress(
            "secure.proxy.mycompany.com", 8080)));

        sociaMediaProxy.add(new Proxy(Type.HTTP, new InetSocketAddress(
                "social-media.proxy.mycompany.com", 8080)));
    }

    @Override
    public List<Proxy> select(URI uri) {

        // No proxy for local company addresses.
        if ( uri.getHost().toLowerCase().endsWith("mycompany.com") ) {
            return noProxy ;
        }

        // Special proxy for social networks.
        String host = uri.getHost().toLowerCase();
        if (    host.endsWith("facebook.com") ||
                host.endsWith("twitter.com") ||
                host.endsWith("cfapps.io") ||               
                host.endsWith("flickr.com") ) 
        {
            return sociaMediaProxy ;
        }

        // for https URIs use secureProxy
        if ( uri.getScheme().toLowerCase().equals("https") ){
            return secureProxy ;
        }

        if (defaultproxySelector != null) {
            return defaultproxySelector.select(uri);
        }

        return noProxy;
    }

    @Override
    public void connectFailed(URI arg0, SocketAddress arg1, IOException arg2) {
        // TODO Auto-generated method stub
    }
}

Answer 2

让 HttpComponentsClientHttpRequestFactory 使用 proxy-stuff 的标准 java SystemProperties 的非常简单的方法（参见 https://docs.oracle.com/javase/8/docs/technotes/guides/net/proxies.html）

这是：

        HttpRoutePlanner routePlanner = new SystemDefaultRoutePlanner(ProxySelector.getDefault());

    HttpClient httpClient = HttpClientBuilder
            .create()
            .setRoutePlanner(routePlanner)
            .build();
    restTemplate.setRequestFactory(
            new HttpComponentsClientHttpRequestFactory(httpClient));

这样，它甚至会考虑 nonProxyHosts 设置。

将代理与 HttpComponentsClientHttpRequestFactory 和 RestTemplate 一起使用

Using Proxy with HttpComponentsClientHttpRequestFactory and RestTemplate

spring

resttemplate

apache-httpcomponents

proxyselector