如何让 HttpURLConnection 使用代理? [英] How do I make HttpURLConnection use a proxy?

问题描述

如果我这样做...

conn = new URL(urlString).openConnection();
System.out.println("Proxy? " + conn.usingProxy());

打印

Proxy? false

问题是，我支持代理.在 Windows 上，JVM 从哪里获取其代理信息?我该如何设置?我的所有其他应用似乎都对我的代理非常满意.

The problem is, I am behind a proxy. Where does the JVM get its proxy information from on Windows? How do I set this up? All my other apps seem perfectly happy with my proxy.

推荐答案

从 java 1.5 开始，您还可以通过 java.net.Proxy 实例到 openConnection(proxy) 方法:

Since java 1.5 you can also pass a java.net.Proxy instance to the openConnection(proxy) method:

//Proxy instance, proxy ip = 10.0.0.1 with port 8080
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.0.1", 8080));
conn = new URL(urlString).openConnection(proxy);

如果您的代理需要身份验证，它会给您响应 407.

If your proxy requires authentication it will give you response 407.

在这种情况下，您将需要以下代码:

In this case you'll need the following code:

    Authenticator authenticator = new Authenticator() {

        public PasswordAuthentication getPasswordAuthentication() {
            return (new PasswordAuthentication("user",
                    "password".toCharArray()));
        }
    };
    Authenticator.setDefault(authenticator);

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