java如果没有代理,为什么我会得到UnknownHostException?
我试图从oracle.com测试这段代码,但是得到了UnknownHostException
。不过,我可以很容易地去甲骨文。com,所有内容在浏览器中都显示良好。我的电脑上没有积木之类的东西
为什么会这样
import java.net.*;
import java.io.*;
public class URLConnectionReader {
public static void main(String[] args) throws Exception {
URL oracle = new URL("http://www.oracle.com/");
URLConnection yc = oracle.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
编辑
我似乎没有任何代理。我是这样检查的
System.setProperty("java.net.useSystemProxies", "true");
System.out.println("detecting proxies");
List l = null;
try {
l = ProxySelector.getDefault().select(new URI("http://foo/bar"));
}
catch (URISyntaxException e) {
e.printStackTrace();
}
if (l != null) {
for (Iterator iter = l.iterator(); iter.hasNext();) {
java.net.Proxy proxy = (java.net.Proxy) iter.next();
System.out.println("proxy type: " + proxy.type());
InetSocketAddress addr = (InetSocketAddress) proxy.address();
if (addr == null) {
System.out.println("No Proxy");
} else {
System.out.println("proxy hostname: " + addr.getHostName());
System.setProperty("http.proxyHost", addr.getHostName());
System.out.println("proxy port: " + addr.getPort());
System.setProperty("http.proxyPort", Integer.toString(addr.getPort()));
}
}
}
the result is
detecting proxies
proxy type: DIRECT
No Proxy
共 (0) 个答案