ttpClient是个开源框架，封装了访问http的请求头，参数，内容体，响应等等，

HttpURLConnection是java的标准类，什么都没封装，用起来太原始，不方便

HttpClient实际上是对Java提供方法的一些封装，

在HttpURLConnection中的输入输出流操作，

在这个接口中被统一封装成了HttpPost(HttpGet)和HttpResponse，

这样，就减少了操作的繁琐性。

性能方面这里做一个测试：

HttpURLConnection VS HttpClient性能测试  

版本： HttpURLConnection  jdk1.6；HttpClient 3.0.1

在项目中有一个特别小的相关应用，在选择时做了一下测试，之前先对两个类进行下说明：

HttpURLConnection  java的标准类(java.net)

HttpClient Jakarta Commons HttpClient，提供对HTTP协议访问的封装，包括http的请求头，参数，内容体，响应等及多线程的应用。

 

测试代码：

 

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();              }          }      }

 

测试结果：

use httpurlconnection: 47

use httpclient: 641

 

结果很明显示，但是在实际应用中，还是应该根据实际的需求进行取舍。

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