java中请求url

	private static String requestData(String params) {
		String totalStr = "";
		try {
			URL url = new URL("http://xxxx");
			URLConnection connection = url.openConnection();
			connection.setDoOutput(true);
			OutputStreamWriter out = new OutputStreamWriter(
					connection.getOutputStream());
			out.write("key=1234567890&pageno=****" + params);
			out.flush();
			out.close();

			String currentLine = "";
			InputStream is = null;
			is = connection.getInputStream();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					is, "utf-8"));
			while ((currentLine = reader.readLine()) != null) {
				totalStr += currentLine;
			}
			if (totalStr != null && totalStr.length() > 0) {
				return new String(totalStr);
			} else {
				return "";
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "";
	}