連接網站時出錯

Question

我試圖運行以下代碼：

public class URLConnectionReader {
    public static void main(String[] args) throws Exception {
        URL oracle = new URL("http://www.google.com/");
        URLConnection yc = oracle.openConnection();
        yc.connect();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                                yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    }
}

但是控制台什么也不顯示，當我嘗試添加yc.connect ，控制台顯示以下錯誤：

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 internet01.URLConnectionReader.main(URLConnectionReader.java:18)

更新：我通過代理連接到互聯網。

Answer 1

您通過代理進行連接，JVM可能不知道這一點。

使用這些參數運行程序

-Dhttp.proxyHost=proxy.ip -Dhttp.proxyPort=proxy.port

或者在您的程序中設置它...

參見克里斯·卡魯瑟斯 （ Chris Carruthers） 的答案 ， gr5