如何在httpclient中设置代理

Question

我正在尝试通过代理抓取网站，我找到了一些免费代理。他们在我的win7中表现不错，但我不知道如何在java中的httpclient中设置代理。

这是我的代码：

    HttpClient httpClient = new HttpClient();  
    httpClient.getHostConfiguration().setProxy("us1.vpnbook.com",8080);  
    httpClient.getParams().setAuthenticationPreemptive(true);
    httpClient.getState().setProxyCredentials(AuthScope.ANY, new UsernamePasswordCredentials("vpn","Phavupr7"));  
    HttpMethod method = new GetMethod("http://www.google.com");
    try {
      httpClient.executeMethod(method);
      if (method.getStatusCode() == HttpStatus.SC_OK) {
          String response = method.getResponseBodyAsString();
          System.out.println("Response = " + response);
      }
  } catch (IOException e) {
      e.printStackTrace();
  } finally {
      method.releaseConnection();
  }

错误消息如下：

September 11, 2014 4:10:10 PM org.apache.commons.httpclient.HttpMethodDirector authenticateHost
Warning: Required credentials not available for BASIC <any realm>@www.google.com:80
September 11, 2014 4:10:10 PM org.apache.commons.httpclient.HttpMethodDirector authenticateHost
Warning: Preemptive authentication requested but no default credentials available
September 11, 2014 4:10:31 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
September 11, 2014 4:10:31 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: Retrying request
September 11, 2014 4:10:52 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
September 11, 2014 4:10:52 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: Retrying request
September 11, 2014 4:11:13 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
September 11, 2014 4:11:13 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
Information: Retrying request
java.net.ConnectException: Connection timed out: 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 java.net.Socket.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:79)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:121)
    at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
    at web2.h.main(h.java:73)