未知主机异常 [英] unknown host exception

问题描述

try { 
{
    long startTime = System.currentTimeMillis();

        String source="s";
        String source1="s";
        URL google = new URL("http://google.com/"); 
        HttpURLConnection yc =(HttpURLConnection)google.openConnection(); 
        BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream())); 
        String inputLine;


        while ((inputLine = in.readLine()) != null) { 
            source=source.concat(inputLine);
        }
        in.close();

        yc.disconnect();

    }

long endTime1 = System.currentTimeMillis();
System.out.println("Total elapsed time in execution of method callMethod() is :"+ (endTime1-startTime));


    } 
}

当我尝试通过命令提示符
i得到

when i tried the above through command prompt i got

java.net.UnknownHostException: google.com 
at java.net.PlainSocketImpl.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 ScagntJavaHttp.httpMakeRequest(ScagntJavaHttp.java:185) 
at test.main(test.java:23)

可以帮我解决这个问题吗？

Can any help me in resolving this one?

推荐答案

尝试删除 http：// 从您的主机URL，当您获得 java.net.UnknownHostException 并检查您的互联网连接和主机存在（可能安全与谷歌。 。 。）

Try removing http:// from your host url when you get java.net.UnknownHostException and check your internet connection and the host exists (probably safe with google . . .)

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