使用jetty 自带的http client！

通常状况下咱们须要使用HttpClient时可供选择的技术有： 
一、HttpURLConnection 
二、Apache HttpClient 
其余的除了写Socket 我都没有用过了。 

偶然的机会发现Jetty 里面也自带了一个HttpClient，而且支持事件触发的处理方式。 

HttpClient client = new HttpClient();
client.setConnectorType(HttpClient.CONNECTOR_SELECT_CHANNEL);
try
{
  client.start();
}
catch (Exception e)
{
  throw new ServletException(e);
}

// create the exchange object, which lets you define where you want to go
// and what you want to do once you get a response
ContentExchange exchange = new ContentExchange()
{
  // define the callback method to process the response when you get it back
  protected void onResponseComplete() throws IOException
  {
    super.onResponseComplete();
    String responseContent = this.getResponseContent();

    // do something with the response content
    ...
  }
};

exchange.setMethod("GET");
exchange.setURL("http://www.example.com/");

// start the exchange
client.send(exchange);

 

 

public static void main(String[] args) throws Exception {
        HttpClient httpClient = new HttpClient();
        // set up httpClient
        httpClient.start();
        ContentExchange contentExchange = new ContentExchange();
        httpClient.setConnectorType(HttpClient.CONNECTOR_SELECT_CHANNEL);
        contentExchange.setURL("http://www.iteye.com");
        httpClient.send(contentExchange);
        contentExchange.waitForDone();
        System.err.println("Response status: "
                + contentExchange.getResponseStatus());
        byte[] responseContentBytes = contentExchange.getResponseContentBytes();
        System.out.println(new String (responseContentBytes,"UTF-8"));
    }