获取未处理的异常类型格式不正确的url异常

Question

我对Java很新，其实我刚开始学习它 我试图做一个练习，练习是读取网页的前五行 开始我写验证码：

import java.io.* ; 

import java.net.URL ; 

class testcode { 

    public static void main(String[] args) throws Exception { 
     URL address = new URL("http://www.yahoo.com/") ; 
     InputStream is = address.openStream() ; 
     InputStreamReader isr = new InputStreamReader(is) ; 
     BufferedReader reader = new BufferedReader(isr) ; 
     String line = reader.readLine() ; 
    } 

} 

但是当我通过Eclipse中运行这段代码，我得到这个：

Exception in thread "main" java.net.ConnectException: Connection refused: connect 
at java.net.DualStackPlainSocketImpl.connect0(Native Method) 
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) 
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) 
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) 
at java.net.AbstractPlainSocketImpl.connect(Unknown Source) 
at java.net.PlainSocketImpl.connect(Unknown Source) 
at java.net.SocksSocketImpl.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 sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) 
at java.net.URL.openStream(Unknown Source) 
at test.testcode.main(testcode.java:10) 

这究竟是为什么！？

andcourse当我不投掷异常部分在开始我得到畸形的url异常！

PS：我的互联网连接工作得很好！

有人请帮助我，解释为什么会发生这种情况吗？ 我有一个相当不错的C++背景，所以请尽可能深入地解释：D

Answer 1

看起来你的程序无法连接到URL。你是否在代理后面使用互联网？如果是这样，那么确保你的程序已经配置好了。一种方法是使用此代码：

System.setProperty("http.proxyHost", "proxy.mydomain.com"); 
System.setPropery("http.proxyPort", "8080");