使用Java设置的代理设置打开浏览器

Question

I need to open a browser from Java code. I understand this can be done as follows :

java.awt.Desktop.getDesktop().browse(java.net.URI.create("http://google.com"));

But i need the browser to use certain proxy settings as well. (ie when the browser opens, its proxy settings must be set to certain values.) I tried using the follwoing code but it doesnt work :

public static void main(String asf[]){
    System.setProperty("java.net.useSystemProxies", "true");
    System.setProperty("http.proxyHost", "127.0.0.1");
    System.setProperty("http.proxyPort", "8080");
    try {
        java.awt.Desktop.getDesktop().browse(java.net.URI.create("http://google.com"));
    } catch (IOException e) {
        e.printStackTrace();
    }
    System.out.println("done");
}

Setting the proxy from command line using

 java -Dhttp.proxyHost=webcache.example.com -Dhttp.proxyPort=8080

is not an option for me. How do i accomplish this?

Answer 1

Your code is largely correct which deals with setting the proxy, but in case it is not working there is another way to set the proxy via Java code and that is via the proxy class.

SocketAddress addr = new InetSocketAddress("socks.example.com", 1080);
Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr);
Socket socket = new Socket(proxy);
InetSocketAddress dest = new InetSocketAddress("server.example.org", 1234);
socket.connect(dest);

Here the socket will try to connect to its destination address (server.example.org:1234) through the specified SOCKS proxy.

For more detail you can go through the Standard Java Documentation for Proxies

Your solution for opening a browser can be improved by adding a check

if(Desktop.isDesktopSupported())
{
  Desktop.getDesktop().browse(new URI("http://www.google.com"));
}

this is in addition to your solution .... maybe you can call it an alternate way

try    { 
    Process p=Runtime.getRuntime().exec("cmd /c start http://www.google.com"); 
} 
catch(IOException e1) {
    System.out.println(e1);
} 

Answer 2

The Google Chromes proxy switches can be useful here. We can just make a shortcut for the chrome browser whose target contains the switch --proxy-server=127.0.0.1:8080 . Now this shortcut can be opened from java code using the Runtime class' exec method. The arguments to exec will be "cmd /c start /d \\"d:\\" chrome.lnk" where d: is the path of my shortcut. A detailed description of this technique can be found here http://sleepingthreads.blogspot.in/2013/07/open-browser-with-proxy-settings-set.html

Note that Google states that the use of switches is not recommended. So use this as a temporary solution only.