public static String sendPost(String url, String param,String wexinsession) {
　　　　para = new String(para.toString().getBytes(), "utf-8"); 
        PrintWriter out = null;
         BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性  addRequestHeader("Content-Type","text/html;charset=UTF-8"); 
            conn.setRequestProperty("Content-Type", "text/html;charset=UTF-8");
            conn.setRequestProperty("Host", PropsUtil.readValue("emdsServerHost"));
            conn.setRequestProperty("Accept", "application/json, text/javascript, */*; q=0.01");
            conn.setRequestProperty("Connection", "keep-alive");
            conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
            conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
            conn.setRequestProperty("Accept-Language", "zh-cn");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Origin", "http://xxx.xxx.xxx);
            conn.setRequestProperty("Content-Length", "700");
            conn.setRequestProperty("Connection", "keep-alive");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0 (iPhone; CPU iPhone OS 9_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13C75 MicroMessenger/6.3.9 NetType/WIFI Language/zh_CN");
            conn.setRequestProperty("Referer", "http://xxx.xxx.xxx/sss.ss");
        
            conn.setRequestProperty("Cookie", wexinsession);
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader( new InputStreamReader(conn.getInputStream(),"utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }

          //  System.out.println(result);
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }