使用 Java 检测 Windows/IE 代理设置 [英] Detecting Windows/IE proxy setting using Java

问题描述

我需要自动检测用户是否需要代理才能访问互联网.Java 应用程序有没有办法读取系统代理设置?

I need to automatically detect if a user requires a proxy to access the internet. Is there a way for a Java application to read the systems proxy setting?

谢谢，吉米

推荐答案

Java SE 1.5 提供了 ProxySelector 类来检测代理设置.如果直接连接到 Internet，代理类型将为 DIRECT，否则将返回主机和端口.

Java SE 1.5 provides ProxySelector class to detect the proxy settings. If there is a Direct connection to Internet the Proxy type will be DIRECT else it will return the host and port.

以下示例说明了此功能:

Example below illustrates this functionality:

import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.URI;
import java.util.Iterator;
import java.util.List;

public class TestProxy {

    public static void main(String[] args) {
        try {
            System.setProperty("java.net.useSystemProxies","true");
            List<Proxy> l = ProxySelector.getDefault().select(
                        new URI("http://www.yahoo.com/"));

            for (Iterator<Proxy> iter = l.iterator(); iter.hasNext(); ) {

                Proxy proxy = iter.next();

                System.out.println("proxy hostname : " + proxy.type());

                InetSocketAddress addr = (InetSocketAddress)proxy.address();

                if(addr == null) {

                    System.out.println("No Proxy");

                } else {
                    System.out.println("proxy hostname : " + addr.getHostName());
                    System.out.println("proxy port : " + addr.getPort());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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