在Java中使用HttpURLConnection时拒绝连接

Question

I'm using a WAMP server on localhost and I have a small Java software that gets a response from a PHP file. I get the error below when I try to get the InputStream from the HttpURLConnection object (also when I try to get the responseCode or the responseMessage...). Help me please.

Error message:

Exception in thread "main" java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
    at javaapplication1.JavaApplication1.main(JavaApplication1.java:28)
C:\Users\Amine\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1

Java code:

public static void main(String[] args) throws MalformedURLException, IOException 
{
    URL url = new URL("http://localhost/test/test.php");
    HttpURLConnection con  = (HttpURLConnection) url.openConnection();
    System.out.println(con.getResponseCode());
}

PHP script (C:\\wamp\\www\\test\\test.php):

<?php echo "Hello world"; ?>

Answer 1

Check your firewall settings.

It looks like connection to localhost:80 is allowed for browser, but disabled for your java app.

Answer 2

All right, i have fixed the problem, it was with the wamp server. i deleted it then i installed it again. and it works fine now.