HttpURLConnection

　　 /**
     * 接口地址
     */
    private static String POST_URL = "http://localhost:88/router/rest";
    
    /**
     * post请求
     * @param url
     * @param param
     * @return
     */
    public static Map<String, String> sendPost(String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        Integer responseCode = null;
        try {
            URL realUrl = new URL(POST_URL);
            // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            conn.setRequestMethod("POST");
            // 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();
            //获取返回状态码，并根据状态码获取输入流
            InputStream is;
            responseCode = conn.getResponseCode();
            if (responseCode == 200) {
                is = conn.getInputStream();
            } else {
                is = conn.getErrorStream();
            }
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(is));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            log.info("发送post请求异常："+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();
            }
        }
        Map<String, String> resultMap = new HashMap<String, String>();
        resultMap.put("responseCode", responseCode.toString());
        resultMap.put("result", result);
        return resultMap;
    }