jsp使用HttpClient發送Post請求例子

司要將自己的產品封裝一個WebService平台，所以最近開始學習使用Java發送Http請求的內容。這一塊之前用PHP的時候寫的也比較多，從用最基本的Socket和使用第三方外掛程式都用過。

學習了Java兩種方式，一種是用java.net.URLConnection，另一種則是大名鼎鼎的HttpClient。效率上沒有做深入研究，使用java.net.URLConnection比較麻煩，而HttpClient就比較愜意。

代碼如下

複製代碼

java.net.URLConnection方法： private static void urlConnectionPost() {     StringBuilder responseBuilder = null;     BufferedReader reader = null;     OutputStreamWriter wr = null;     URL url;     try {         url = new URL(TEST_URL);         URLConnection conn = url.openConnection();         conn.setDoOutput(true);         conn.setConnectTimeout(1000 * 5);         wr = new OutputStreamWriter(conn.getOutputStream());         wr.write("");         wr.flush();         // Get the response         reader = new BufferedReader(new InputStreamReader(conn                 .getInputStream()));         responseBuilder = new StringBuilder();         String line = null;         while ((line = reader.readLine()) != null) {             responseBuilder.append(line + "n");         }         wr.close();         reader.close();         System.out.println(responseBuilder.toString());     } catch (IOException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } } HttpClient方法： private static void httpClientPost() {     HttpClient client = new DefaultHttpClient();     HttpPost post = new HttpPost(TEST_URL);     try {         ContentProducer cp = new ContentProducer() {             public void writeTo(OutputStream outstream) throws IOException {                 Writer writer = new OutputStreamWriter(outstream, "UTF-8");                 writer.write("");                 writer.flush();             }         };         post.setEntity(new EntityTemplate(cp));         HttpResponse response = client.execute(post);             System.out.println(EntityUtils.toString(response.getEntity()));     } catch (ClientProtocolException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } catch (IOException e) {         // TODO Auto-generated catch block         e.printStackTrace();     } }