HttpURLConnection 访问网页异常?报错

最近学习模仿浏览器访问网页。按照网上的代码试验了一下，同样的代码在公司会报  Connection timed out: connect的错误，但是在家里就能正常运行，以为是代理的问题，但是发现IE并没有设置代理，并且我用c#基本上相似的代码写出的程序是可以访问的，所以就很郁闷。以下是代码：

public static void main(String[] args) throws Exception {
        String uRL = "http://www.baidu.com/";
        HttpURLConnection connection = (HttpURLConnection)new URL(uRL).openConnection();
     
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
        connection.setRequestMethod("GET");
        connection.connect();
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String lines;
        while ((lines = reader.readLine()) != null) {
            System.out.println(lines);
        }
        reader.close();
        connection.disconnect();
}

公司：浏览器访问正常，c#版的访问正常，java版的在connection.getInputStream()处会等待很长时间然后报错异常，并且用fiddle跟发现根本就没有发送请求。

家里面：同样的java代码时刻一运行的。

希望大神们能够指出我的错误，谢谢了。

异常代码

Exception in thread "main" java.net.ConnectException: Connection timed out: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:337)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:198)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
	at java.net.Socket.connect(Socket.java:579)
	at java.net.Socket.connect(Socket.java:528)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:213)
	at sun.net.www.http.HttpClient.New(HttpClient.java:300)
	at sun.net.www.http.HttpClient.New(HttpClient.java:316)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:971)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846)
	at vjia.open.Main.main(Main.java:29)