收到錯誤未知主機：www.google.com

Question

我想解析網頁，我正在使用 htmlunit，當我運行代碼時，我遇到了以下錯誤。

import java.net.URL;
import java.util.List;

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlImage;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class scrapImage {

      public static void main(String[] args) throws Exception      { 
          URL url = new URL("http://www.google.com");
          //WebClient webClient = new WebClient(Opera);     
          WebClient webClient = new WebClient();    
          HtmlPage currentPage = (HtmlPage) webClient.getPage(url);    
          //get list of all divs      
          final List<?> images = currentPage.getByXPath("//img");      
          for (Object imageObject : images) {           
              HtmlImage image = (HtmlImage) imageObject;            
              System.out.println(image.getSrcAttribute());       
              }         //webClient.closeAllWindows();           } } 
          }
      }

錯誤信息：

Exception in thread "main" java.net.UnknownHostException: www.google.com
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:196)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:377)
    at java.net.Socket.connect(Socket.java:530)
    at java.net.Socket.connect(Socket.java:480)
    at java.net.Socket.<init>(Socket.java:377)
    at java.net.Socket.<init>(Socket.java:251)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
    at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
    at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
    at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:97)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1430)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1388)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:325)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:386)
    at htmlunit.scrapImage.main(scrapImage.java:16)

誰能告訴我上述異常的解決方案。

Answer 1

我認為您的 .net 連接問題或您的防火牆可能會阻止 java 程序訪問 inte.net。

Answer 2

我認為你在代理或防火牆后面。 檢查您系統中當前的防火牆狀態。另外，如果它與代理有關，您可以像這樣修改代碼。

System.getProperties().put( "proxySet", "true" );
System.getProperties().put( "proxyHost", "your proxy host name" );
System.getProperties().put( "proxyPort", "85" );

可能這會對你有所幫助。

Answer 3

Inte.net 連接似乎有問題，或者您使用了代理，

如果是這種情況，請設置代理設置（主機/端口/用戶名/密碼）。