的BufferedReader異常

Question

我用：

try { 
     URL _url = new URL(url); 
     HttpURLConnection conn = (HttpURLConnection) _url.openConnection(); 
     BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); 
     String line; 
     while ((line = rd.readLine()) != null) { 
      teste = teste + line; 
     } 
     rd.close(); 
    } catch (Exception e) { 
     System.out.println("Exception===" + e); 
     return null; 
    } 

    return teste; 

，我發現了以下異常：

Exception StackTrace: 
    java.net.UnknownHostException: api 
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:225) 
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:377) 
    at java.net.Socket.connect(Socket.java:539) 
    at java.net.Socket.connect(Socket.java:488) 
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175) 
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:424) 
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:538) 
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:221) 
    at sun.net.www.http.HttpClient.New(HttpClient.java:304) 
    at sun.net.www.http.HttpClient.New(HttpClient.java:323) 
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:999) 
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:935) 
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:853) 
    at sun.net.www.protocol.http.HttpURLConnection.followRedirect(HttpURLConnection.java:2168) 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1402) 

Answer 1

的問題是，你不能連接到您的網址。 UnknownHostException表明您嘗試連接的地址不存在。