ttpClient是個(gè)開源框架，封裝了訪問http的請求頭，參數(shù)，內(nèi)容體，響應(yīng)等等，

HttpURLConnection是java的標(biāo)準(zhǔn)類，什么都沒封裝，用起來太原始，不方便

HttpClient實(shí)際上是對Java提供方法的一些封裝，

在HttpURLConnection中的輸入輸出流操作，

在這個(gè)接口中被統(tǒng)一封裝成了HttpPost(HttpGet)和HttpResponse，

這樣，就減少了操作的繁瑣性。

性能方面這里做一個(gè)測試：

HttpURLConnection VS HttpClient性能測試??

版本： HttpURLConnection? jdk1.6；HttpClient 3.0.1

在項(xiàng)目中有一個(gè)特別小的相關(guān)應(yīng)用，在選擇時(shí)做了一下測試，之前先對兩個(gè)類進(jìn)行下說明：

HttpURLConnection? java的標(biāo)準(zhǔn)類(java.net)

HttpClient Jakarta Commons HttpClient，提供對HTTP協(xié)議訪問的封裝，包括http的請求頭，參數(shù)，內(nèi)容體，響應(yīng)等及多線程的應(yīng)用。

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測試代碼：

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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(); } } }

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測試結(jié)果：

use httpurlconnection: 47

use httpclient: 641

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結(jié)果很明顯示，但是在實(shí)際應(yīng)用中，還是應(yīng)該根據(jù)實(shí)際的需求進(jìn)行取舍。

相關(guān)文章：

HttpURLConnection和HTTPClient的比較,以及使用規(guī)則

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