IT工程師數位筆記本

    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();  
            }  
        }  
    }