后台发送post请求

		/**
	     * 发送post请求
	     *
	     * @param baseUrl
	     * @param paramMap
	     * @param mediaType
	     * @param headers
	     * @param json
	     * @return
	     */
	    private  String doPost(String baseUrl, Map<String, String> paramMap, String mediaType,
	                                 Map<String, String> headers, String json) throws Exception {

	        HttpURLConnection urlConnection = null;
	        InputStream in = null;
	        OutputStream out = null;
	        BufferedReader bufferedReader = null;
	        String result = null;
	        try {
	            StringBuffer sb = new StringBuffer();
	            sb.append(baseUrl);
	            if (paramMap != null) {
	                sb.append("?");
	                for (Map.Entry<String, String> entry : paramMap.entrySet()) {
	                    String key = entry.getKey();
	                    String value = entry.getValue();
	                    sb.append(key + "=" + value).append("&");
	                }
	                baseUrl = sb.toString().substring(0, sb.toString().length() - 1);
	            }

	            URL urlObj = new URL(baseUrl);
	            urlConnection = (HttpURLConnection) urlObj.openConnection();
	            urlConnection.setConnectTimeout(50000);
	            urlConnection.setRequestMethod("POST");
	            urlConnection.setDoOutput(true);
	            urlConnection.setDoInput(true);
	            urlConnection.setUseCaches(false);
	            urlConnection.addRequestProperty("content-type", mediaType);
	            if (headers != null) {
	                for (String key : headers.keySet()) {
	                    urlConnection.addRequestProperty(key, headers.get(key));
	                }
	            }
	            out = urlConnection.getOutputStream();
	            out.write(json.getBytes("utf-8"));
	            out.flush();
	            int resCode = urlConnection.getResponseCode();
	            System.out.println("状态码：：" + resCode);
//				if (resCode == HttpURLConnection.HTTP_OK || resCode == HttpURLConnection.HTTP_CREATED || resCode == HttpURLConnection.HTTP_ACCEPTED) {
	            in = urlConnection.getInputStream();
//				} else {
//					in = urlConnection.getErrorStream();
//				}
	            bufferedReader = new BufferedReader(new InputStreamReader(in, "utf-8"));
	            StringBuffer temp = new StringBuffer();
	            String line = bufferedReader.readLine();
	            while (line != null) {
	                temp.append(line).append("\r\n");
	                line = bufferedReader.readLine();
	            }
	            String ecod = urlConnection.getContentEncoding();
	            if (ecod == null) {
	                ecod = Charset.forName("utf-8").name();
	            }
	            result = new String(temp.toString().getBytes("utf-8"), ecod);
	            System.out.println(result);
	        } catch (Exception e) {
	            System.out.println(e);
	            throw e;
	        } finally {
	            if (null != bufferedReader) {
	                try {
	                    bufferedReader.close();
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	            if (null != out) {
	                try {
	                    out.close();
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	            if (null != in) {
	                try {
	                    in.close();
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	            urlConnection.disconnect();
	        }
	        return result;
	    }