[英]java tutorial - unknown host exception
我正在尝试使用教程阅读URL: http : //docs.oracle.com/javase/tutorial/networking/urls/readingURL.html
import java.net.*;
import java.io.*;
public class URLReader {
public static void main(String[] args) throws Exception {
URL oracle = new URL("http://www.google.com/");
BufferedReader in = new BufferedReader(new InputStreamReader(oracle.openStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
但我得到的是异常。 www.google.com是众所周知的主持人?
Exception in thread "main" java.net.UnknownHostException: www.google.com
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:395)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:234)
at sun.net.www.http.HttpClient.New(HttpClient.java:307)
at sun.net.www.http.HttpClient.New(HttpClient.java:324)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)
at java.net.URL.openStream(URL.java:1010)
at URLReader.main(URLReader.java:8)
你是代理人吗? 尝试在eclipse中设置代理或尝试
java -DproxySet=true -DproxyHost=10.0.0.14 -DproxyPort=6588 JavApp
你在代理后面跑? 文章似乎表明在这种情况下需要配置。
或者,程序可能会挂起,或者您可能会看到异常堆栈跟踪。 如果发生后两个事件中的任何一个,则可能必须设置代理主机,以便程序可以找到Oracle服务器。
我认为它的网络错误检查你的互联网连接....
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