Problem to connect with JAVA

[Sylver]

Hello
I'm trying to connect my sabnzbd server with a little java software that i'm writing.
But it doesn't work and i don't understand why... so if anyone can help... (i'm not java noob but i dont find my mistake)
So i use :

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URL sabnzbd = new URL("http","localhost",-1,"api?mode=queue&output=xml");
BufferedReader in = new BufferedReader(new InputStreamReader(sabnzbd.openStream()));

The exception :

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Exception in thread "main" java.net.ConnectException: Connection refused: connect
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(Unknown Source)
	at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
	at java.net.PlainSocketImpl.connect(Unknown Source)
	at java.net.SocksSocketImpl.connect(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at sun.net.NetworkClient.doConnect(Unknown Source)
	at sun.net.www.http.HttpClient.openServer(Unknown Source)
	at sun.net.www.http.HttpClient.openServer(Unknown Source)
	at sun.net.www.http.HttpClient.<init>(Unknown Source)
	at sun.net.www.http.HttpClient.New(Unknown Source)
	at sun.net.www.http.HttpClient.New(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at java.net.URL.openStream(Unknown Source)
	at hello.main(hello.java:10)

The url is okay (localhost, port 80, i desactivate the API key for test).
If i access sabnzbd via Chrome/FF/etc with the url "http://localhost/api?mode=queue&output=xml" it's working.
If i try to connect java to my apache webserver which is on the port 81, it's working.

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URL sabnzbd = new URL("http","localhost",81,"");
BufferedReader in = new BufferedReader(new InputStreamReader(sabnzbd.openStream()));

and i can read the page on the BufferedReader.
So why it's not working with sabnzbd ? I'm sure it's a stupid mistake (it's always is) but i don't see it...

Thanks guys