如何在不设置系统范围属性的情况下将 HTTP 代理用于 JAX-WS 请求？

我有一个应用程序需要向 Internet 上的系统发出 SOAP 客户端请求，因此它需要通过我们的 HTTP 代理。

可以通过设置系统范围的值（例如系统属性）来做到这一点：

// Cowboy-style.  Blow away anything any other part of the application has set.
System.getProperties().put("proxySet", "true");
System.getProperties().put("https.proxyHost", HTTPS_PROXY_HOST);  
System.getProperties().put("https.proxyPort", HTTPS_PROXY_PORT);

或者通过设置默认的 ProxySelector （也是系统范围的设置）：

// More Cowboy-style!  Every thing Google has found says to do it this way!?!?!
ProxySelector.setDefault(new MyProxySelector(HTTPS_PROXY_HOST, HTTPS_PROXY_PORT));

如果其他子系统可能希望通过不同的 HTTP 代理或不使用任何代理来访问 Web 服务器，那么这两种方法都不是明智的选择。使用ProxySelector会让我配置哪些连接使用代理，但我必须弄清楚庞大应用程序中的每件事。

一个合理的 API 应该有一个方法，该方法采用java.net.Proxy对象就像java.net.Socket(java.net.Proxy proxy)构造函数确实如此。这样，必要的设置就位于需要设置它们的系统部分的本地。有没有办法用 JAX-WS 来做到这一点？

我不想设置系统范围的代理配置。

我建议使用自定义 ProxySelector。我遇到了同样的问题，它工作得很好并且非常灵活。这也很简单。

这是我的 CustomProxySelector：

import org.hibernate.validator.util.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.*;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

/**
 * So the way a ProxySelector works is that for all Connections made,
 * it delegates to a proxySelector(There is a default we're going to
 * override with this class) to know if it needs to use a proxy
 * for the connection.
 * <p>This class was specifically created with the intent to proxy connections
 * going to the allegiance soap service.</p>
 *
 * @author Nate
 */
class CustomProxySelector extends ProxySelector {

    private final ProxySelector def;

    private Proxy proxy;

    private static final Logger logger = Logger.getLogger(CustomProxySelector.class.getName());

    private List<Proxy> proxyList = new ArrayList<Proxy>();

    /*
     * We want to hang onto the default and delegate
     * everything to it unless it's one of the url's
     * we need proxied.
     */
    CustomProxySelector(String proxyHost, String proxyPort) {
        this.def = ProxySelector.getDefault();
        proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, (null == proxyPort) ? 80 : Integer.valueOf(proxyPort)));
        proxyList.add(proxy);
        ProxySelector.setDefault(this);
    }

    @Override
    public List<Proxy> select(URI uri) {
        logger.info("Trying to reach URL : " + uri);
        if (uri == null) {
            throw new IllegalArgumentException("URI can't be null.");
        }
        if (uri.getHost().contains("allegiancetech")) {
            logger.info("We're trying to reach allegiance so we're going to use the extProxy.");
            return proxyList;
        }
        return def.select(uri);
    }

    /*
    * Method called by the handlers when it failed to connect
    * to one of the proxies returned by select().
    */
    @Override
    public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
        logger.severe("Failed to connect to a proxy when connecting to " + uri.getHost());
        if (uri == null || sa == null || ioe == null) {
            throw new IllegalArgumentException("Arguments can't be null.");
        }
        def.connectFailed(uri, sa, ioe);
    }
}