httpclient4 小例子

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;public class HttpClientTest {public static void main(String[] args) throws ClientProtocolException,IOException { HttpClient httpclient = new DefaultHttpClient(); // Prepare a request object HttpGet httpget = new HttpGet("*********"); httpget.addHeader("accept-encoding", "gzip,deflate");  httpget.addHeader("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Alexa Toolbar; Maxthon 2.0)");  // Execute the request HttpResponse response = httpclient.execute(httpget); // Examine the response status System.out.println(response.getStatusLine()); // Get hold of the response entity HttpEntity entity = response.getEntity(); // to worry about connection release if (entity != null) {     InputStream instream = entity.getContent();     try {         BufferedReader reader = new BufferedReader(                 new InputStreamReader(instream));         // do something useful with the response         String htmlStr;         while((htmlStr = reader.readLine()) != null ){         System.out.println(htmlStr);         }        // System.out.println(reader.readLine());     } catch (IOException ex) {         // In case of an IOException the connection will be released         // back to the connection manager automatically         throw ex;     } catch (RuntimeException ex) {         // In case of an unexpected exception you may want to abort         // the HTTP request in order to shut down the underlying         // connection and release it back to the connection manager.         httpget.abort();         throw ex;     } finally {         // Closing the input stream will trigger connection release         instream.close();     }     // When HttpClient instance is no longer needed,     // shut down the connection manager to ensure     // immediate deallocation of all system resources     httpclient.getConnectionManager().shutdown(); }}}