Post方式发送http请求参数

public boolean uploadPostMethod(String path, Map<String, String> params) throws IOException{
		StringBuilder sb = new StringBuilder();
		for(Map.Entry<String, String> entry : params.entrySet()){
			//sb.append(entry.getKey()).append('=').append(entry.getValue()).append('&');
			sb.append(entry.getKey()).append('=').append(URLEncoder.encode(entry.getValue(), "UTF-8")).append('&');
		}
		sb.deleteCharAt(sb.length() - 1);
		byte[] entitydata = sb.toString().getBytes();
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection)url.openConnection();
		conn.setConnectTimeout(5 * 1000);
		conn.setRequestMethod("POST");
		conn.setDoOutput(true);
		conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
		conn.setRequestProperty("Content-Length", String.valueOf(entitydata.length));
		OutputStream os = conn.getOutputStream();
		os.write(entitydata);
		os.flush();
		os.close();
		if(conn.getResponseCode() == 200){
			return true;
		}
		return false;
	}