Java Java中发送POST请求

void testPackage(String urlStr) {
		try {
			StringBuffer xmlBuffer = new StringBuffer();
			xmlBuffer.append("<params>");
			xmlBuffer.append("<id>");
			xmlBuffer.append("1");
			xmlBuffer.append("</id>");
			xmlBuffer.append("</params>");

			URL url = new URL(urlStr);
			URLConnection con = url.openConnection();
			con.setDoOutput(true);
			con.setRequestProperty("Pragma:", "no-cache");
			con.setRequestProperty("Cache-Control", "no-cache");
			con.setRequestProperty("Content-Type", "text/xml");

			/*
			 * OutputStreamWriter out = new OutputStreamWriter(
			 * con.getOutputStream());
			 */
			String xmlInfo = "params=" + xmlBuffer.toString();
			PrintWriter out = new PrintWriter(con.getOutputStream());
			out.print(xmlInfo);
			// out.print(URLEncoder.encode(xmlInfo,"UTF-8"));

			// out.write(new String(xmlInfo.getBytes("UTF-8")));
			out.flush();
			out.close();
			BufferedReader br = new BufferedReader(new InputStreamReader(
					con.getInputStream()));
			String line = "";
			for (line = br.readLine(); line != null; line = br.readLine()) {
				System.out.println(line);
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}