How to use automatic proxy configuration script in Java

java, pac, proxy

Solution

Wow! I could load Proxy Auto-Config (PAC) file on Java. Please see below codes and package.

import com.sun.deploy.net.proxy.*;
.
.
BrowserProxyInfo b = new BrowserProxyInfo();        
b.setType(ProxyType.AUTO);
b.setAutoConfigURL("http://yourhost/proxy.file.pac");       
DummyAutoProxyHandler handler = new DummyAutoProxyHandler();
handler.init(b);

URL url = new URL("http://host_to_query");
ProxyInfo[] ps = handler.getProxyInfo(url);     
for(ProxyInfo p : ps){
    System.out.println(p.toString());
}

You already have a [com.sun.deploy.net.proxy] package on your machine! Find [deploy.jar] ;D

Problem

My Internet Explorer is set to have an automatic proxy file(so-called PAC) for web access. Is there a way to use this on my Java program, also ? My below Java code does not seem to use proxy at all. ``` ArrayList<Proxy> ar = new ArrayList<Proxy>(ProxySelector.getDefault().select(new URI("http://service.myurlforproxy.com"))); for(Proxy p : ar){ System.out.println(p.toString()); //output is just DIRECT T.T it should be PROXY. } ``` I also set my proxy script on Java Control Panel(Control->Java), but the same result. and I found there's no way to set PAC file for Java programmatically. People use http.proxyHost for System.setProperties(..) but this is a only for setting proxy host, not proxy script(PAC file).

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