import java.io.BufferedReader;  import java.io.IOException;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.net.HttpURLConnection;  import java.net.MalformedURLException;  import java.net.URL;  import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;  import org.apache.commons.httpclient.HttpClient;  import org.apache.commons.httpclient.HttpException;  import org.apache.commons.httpclient.HttpStatus;  import org.apache.commons.httpclient.methods.GetMethod;  import org.apache.commons.httpclient.params.HttpMethodParams;  public class HttpClientTest {  private static String link = "http://www.baidu.com";  public static void main(String[] args) {  long a = System.currentTimeMillis();  useHttpURlConnection();  long b = System.currentTimeMillis();  System.out.println("use httpurlconnection: "+(b-a));  long c = System.currentTimeMillis();  useHttpClient();  long d = System.currentTimeMillis();  System.out.println("use httpclient: "+(d-c));  }  public static void useHttpURlConnection(){  HttpURLConnection conn = null;  URL url = null;  String result = "";  try {  url = new java.net.URL(link);  conn = (HttpURLConnection) url.openConnection();  conn.setConnectTimeout(10000);  conn.connect();  InputStream urlStream = conn.getInputStream();  BufferedReader reader = new BufferedReader(new InputStreamReader(urlStream));  String s = "";  while ((s = reader.readLine()) != null) {  result += s;  }  System.out.println(result);  reader.close();  urlStream.close();  conn.disconnect();  } catch (MalformedURLException e) {  e.printStackTrace();  } catch (IOException e) {  e.printStackTrace();  } catch(Exception e){  e.printStackTrace();  }  }  public static void useHttpClient(){  HttpClient client = new HttpClient();  GetMethod method = new GetMethod(link);  method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,  new DefaultHttpMethodRetryHandler(3, false));  try {  int statusCode = client.executeMethod(method);  if (statusCode != HttpStatus.SC_OK) {  System.err.println("Method failed: " + method.getStatusLine());  }  byte[] responseBody = method.getResponseBody();  System.out.println(new String(responseBody));  } catch (HttpException e) {  System.err.println("Fatal protocol violation: " + e.getMessage());  e.printStackTrace();  } catch (IOException e) {  System.err.println("Fatal transport error: " + e.getMessage());  e.printStackTrace();  } finally {  method.releaseConnection();  }  }  }