/**
	 * 采用httpclientPost请求的方式
	 * 
	 * @param username
	 * @param password
	 * @return null表示求得的路径有问题,text返回请求得到的数据
	 */
	public static String httpclientPost(String username, String password) {
		try {
			// 1.打开一个浏览器
			HttpClient client = new DefaultHttpClient();
			// 2.输入地址
			String path = "http://172.22.64.156:8080/0001AndroidWebService/LoginServlet";
			HttpPost post = new HttpPost();

			// 指定提交的数据实体
			List<NameValuePair> parameters = new ArrayList<NameValuePair>();
			parameters.add(new BasicNameValuePair("username", username));
			parameters.add(new BasicNameValuePair("password", password));

			post.setEntity(new UrlEncodedFormEntity(parameters, "UTF-8"));
			// 3,敲回车
			HttpResponse response = client.execute(post);
			// 获取返回的码
			int code = response.getStatusLine().getStatusCode();
			if (code == 200) {
				// 获取返回的信息
				InputStream is = response.getEntity().getContent();
				String text = StreamUtil.readStream(is);
				return text;
			} else {
				return null;
			}
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}