java .net。 ConnectException：连接被拒绝

Question

1. 我试图拨打http电话，如果我设置＆＃34; localost：8090＆＃34;在我的网址中 代码工作     如果我设置外部IP代码不起作用。

   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)
   

代码就是这个

   URL url = new URL("http://www.searchinquire.com/");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            BufferedReader br = new BufferedReader(new InputStreamReader(
                (conn.getInputStream())));

            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }

            conn.disconnect();

          } catch (MalformedURLException e) {

            e.printStackTrace();

          } catch (IOException e) {

            e.printStackTrace();

          }