public class CustomHttpClient {
	private static String TAG = "CustomHttpClient";
	private static final CommonLog log = LogFactory.createLog();
	private static final String CHARSET_UTF8 = HTTP.UTF_8;
	private static final String CHARSET_GB2312 = "GB2312";
	private static HttpClient customerHttpClient;

	private CustomHttpClient() {

	}

	/**
	 * HttpClient post方法
	 * 
	 * @param url
	 * @param nameValuePairs
	 * @return
	 */
	public static String PostFromWebByHttpClient(Context context, String url,
			NameValuePair... nameValuePairs) {
		try {
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			if (nameValuePairs != null) {
				for (int i = 0; i < nameValuePairs.length; i++) {
					params.add(nameValuePairs[i]);
				}
			}
			UrlEncodedFormEntity urlEncoded = new UrlEncodedFormEntity(params,
					CHARSET_UTF8);
			HttpPost httpPost = new HttpPost(url);
			httpPost.setEntity(urlEncoded);
			HttpClient client = getHttpClient(context);
			HttpResponse response = client.execute(httpPost);
			if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
				throw new RuntimeException("请求失败");
			}
			HttpEntity resEntity = response.getEntity();
			return (resEntity == null) ? null : EntityUtils.toString(resEntity,
					CHARSET_UTF8);
		} catch (UnsupportedEncodingException e) {
			Log.w(TAG, e.getMessage());
			return null;
		} catch (ClientProtocolException e) {
			Log.w(TAG, e.getMessage());
			return null;
		} catch (IOException e) {
			throw new RuntimeException(context.getResources().getString(
					R.string.httpError), e);
		} 
	}

	public static String getFromWebByHttpClient(Context context, String url,
			NameValuePair... nameValuePairs) throws Exception{
			log.d("getFromWebByHttpClient url = " + url);
		try {
			// http地址
			// String httpUrl =
			// "http://192.168.1.110:8080/httpget.jsp?par=HttpClient_android_Get";
			StringBuilder sb = new StringBuilder();
			sb.append(url);
			if (nameValuePairs != null && nameValuePairs.length > 0) {
				sb.append("?");
				for (int i = 0; i < nameValuePairs.length; i++) {
					if (i > 0) {
						sb.append("&");
					}
					sb.append(String.format("%s=%s",
							nameValuePairs[i].getName(),
							nameValuePairs[i].getValue()));
				}
			}
			// HttpGet连接对象
			HttpGet httpRequest = new HttpGet(sb.toString());
			// 取得HttpClient对象
			HttpClient httpclient = getHttpClient(context);
			// 请求HttpClient，取得HttpResponse
			HttpResponse httpResponse = httpclient.execute(httpRequest);
			// 请求成功
			if (httpResponse.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
				throw new RuntimeException(context.getResources().getString(
						R.string.httpError));
			}
			return EntityUtils.toString(httpResponse.getEntity());
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			throw new RuntimeException(context.getResources().getString(
					R.string.httpError),e);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			log.e("IOException ");
			e.printStackTrace();
			throw new RuntimeException(context.getResources().getString(
					R.string.httpError),e);
		} 	
	}

	/**
	 * 创建httpClient实例
	 * 
	 * @return
	 * @throws Exception
	 */
	private static synchronized HttpClient getHttpClient(Context context) {
		if (null == customerHttpClient) {
			HttpParams params = new BasicHttpParams();
			// 设置一些基本参数
			HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
			HttpProtocolParams.setContentCharset(params, CHARSET_UTF8);
			HttpProtocolParams.setUseExpectContinue(params, true);
			HttpProtocolParams
					.setUserAgent(
							params,
							"Mozilla/5.0(Linux;U;Android 2.2.1;en-us;Nexus One Build.FRG83) "
									+ "AppleWebKit/553.1(KHTML,like Gecko) Version/4.0 Mobile Safari/533.1");
			// 超时设置
			/* 从连接池中取连接的超时时间 */
			ConnManagerParams.setTimeout(params, 1000);
			/* 连接超时 */
			int ConnectionTimeOut = 3000;
			if (!HttpUtils.isWifiDataEnable(context)) {
				ConnectionTimeOut = 10000;
			}
			HttpConnectionParams
					.setConnectionTimeout(params, ConnectionTimeOut);
			/* 请求超时 */
			HttpConnectionParams.setSoTimeout(params, 4000);
			// 设置我们的HttpClient支持HTTP和HTTPS两种模式
			SchemeRegistry schReg = new SchemeRegistry();
			schReg.register(new Scheme("http", PlainSocketFactory
					.getSocketFactory(), 80));
			schReg.register(new Scheme("https", SSLSocketFactory
					.getSocketFactory(), 443));

			// 使用线程安全的连接管理来创建HttpClient
			ClientConnectionManager conMgr = new ThreadSafeClientConnManager(
					params, schReg);
			customerHttpClient = new DefaultHttpClient(conMgr, params);
		}
		return customerHttpClient;
	}
}

自定义HttpClient工具类