HttpClient发送请求到服务端

/**
     * 向指定 URL 发送POST方法的请求
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String jsh, String url, String param, String charset, Map<String, String> requestPropertyMap) throws MyFPException {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            logger.info("Start 结算号【".concat(jsh).concat("】").concat(", HttpClientUtil.sendPost(String urlStr, ICBCReqHead iCBCReqHead)开始支调用工行支付接口操作, 当前时间【".concat(DateUtil.dateToString(new Date(), DateUtil.FORMAT_DATETIME)).concat("】")));
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置连接超时和读取超时
            connection.setConnectTimeout(30 * 1000);
            connection.setReadTimeout(60 * 1000);
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            for(Iterator<Map.Entry<String, String>> it = requestPropertyMap.entrySet().iterator(); it.hasNext();){
                Map.Entry<String, String> entry = it.next();
                connection.setRequestProperty(entry.getKey(), entry.getValue());
            }
            // 发送POST请求必须设置如下两行
            connection.setDoOutput(true);
            connection.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(new OutputStreamWriter(connection.getOutputStream(), charset));
            // 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(connection.getInputStream(),"GB2312"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            logger.info("End 结算号【".concat(jsh).concat("】").concat(", HttpClientUtil.sendPost(String urlStr, ICBCReqHead iCBCReqHead)结束支调用工行支付接口操作, 当前时间【".concat(DateUtil.dateToString(new Date(), DateUtil.FORMAT_DATETIME)).concat("】")));
            return result;
        } catch (MalformedURLException e) {
            logger.error("工行支付签名接口URL协议、格式或者路径异常！", e);
            throw new MyFPException("-1", "工行支付签名接口URL协议、格式或者路径异常！", e);
        } catch (UnsupportedEncodingException e) {
            logger.error("工行支付读写文本字符串转换异常！", e);
            throw new MyFPException("-1", "工行支付读写文本字符串转换异常！", e);
        } catch (IOException e) {
            logger.error("工行支付签名接口打开Http连接异常！", e);
            throw new MyFPException("-1", "工行支付签名接口打开Http连接异常！", e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                logger.error("Exception is happened!", e);
            }
        }
    }