Android学习笔记：利用httpclient和AsyncTask 发起网络http post操作

	public void loadData() {
		new AsyncTask<String, Void, String>() {
			@Override
			protected String doInBackground(String... paramsInput) {
				String url = "http://10.0.0.5:8080/examples/action";
				List<NameValuePair> params = new ArrayList<NameValuePair>();
				params.add(new BasicNameValuePair("type", paramsInput[0]));
				params.add(new BasicNameValuePair("id", paramsInput[1]));
				/* 建立HTTPPost对象 */
				HttpPost httpRequest = new HttpPost(url);

				String strResult = "doPostError";
				try {
					HttpClient httpClient = getHttpClient();
					/* 添加请求参数到请求对象 */
					httpRequest.setEntity(new UrlEncodedFormEntity(params,
							HTTP.UTF_8));
					/* 发送请求并等待响应 */
					HttpResponse httpResponse = httpClient.execute(httpRequest);
					/* 若状态码为200 ok */
					if (httpResponse.getStatusLine().getStatusCode() == 200) {
						/* 读返回数据 */
						strResult = EntityUtils.toString(httpResponse
								.getEntity());

					} else {
						strResult = "Error Response: "
								+ httpResponse.getStatusLine().toString();
					}
				} catch (ClientProtocolException e) {
					strResult = "Error Response: " + e.getMessage().toString();
					e.printStackTrace();
				} catch (IOException e) {
					strResult = "Error Response: " + e.getMessage().toString();
					e.printStackTrace();
				} catch (Exception e) {
					strResult = "Error Response: " + e.getMessage().toString();
					e.printStackTrace();
				}
				return strResult;
			}

			@Override
			protected void onPostExecute(String result) {
				TextView view = (TextView) findViewById(R.id.resultText);
				view.setText(result);
				super.onPostExecute(result);
			}

		}.execute("query","1");
	}

private HttpClient getHttpClient() {

		// 创建 HttpParams 以用来设置 HTTP 参数（这一部分不是必需的）

		HttpParams httpParams = new BasicHttpParams();

		// 设置连接超时和 Socket 超时，以及 Socket 缓存大小

		HttpConnectionParams.setConnectionTimeout(httpParams, 20 * 1000);

		HttpConnectionParams.setSoTimeout(httpParams, 20 * 1000);

		HttpConnectionParams.setSocketBufferSize(httpParams, 8192);

		// 设置重定向，缺省为 true

		HttpClientParams.setRedirecting(httpParams, true);

		// 设置 user agent

		String userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2) Gecko/20100115 Firefox/3.6";
		HttpProtocolParams.setUserAgent(httpParams, userAgent);

		// 创建一个 HttpClient 实例

		// 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient

		// 中的用法，在 Android 1.5 中我们需要使用 Apache 的缺省实现 DefaultHttpClient

		HttpClient httpClient = new DefaultHttpClient(httpParams);

		return httpClient;
	}