java实现http协议发送和接收数据

 public void sendMessage() throws Exception {
        System.out.println("调用servlet开始=================");
        StringBuffer sendStr = new StringBuffer();
        sendStr.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        sendStr.append("<report_data>");
        sendStr.append("<request_req>953943547334</request_req>");
        sendStr.append("<request_time>2012040211394324</request_time>");
        sendStr.append("<request_param>");
        sendStr.append("<query_month>201203</query_month>");
        sendStr.append("</request_param>");
        sendStr.append("</report_data>");

        BufferedReader reader = null;

        try {
            String strMessage = "";
            StringBuffer buffer = new StringBuffer();

            // 接报文的地址
            URL uploadServlet = new URL(
                   "http://localhost:9090/TestTransfers");

            HttpURLConnection servletConnection = (HttpURLConnection) uploadServlet
                   .openConnection();
            // 设置连接参数
            servletConnection.setRequestMethod("POST");
            servletConnection.setDoOutput(true);
            servletConnection.setDoInput(true);
            servletConnection.setAllowUserInteraction(true);

            // 开启流，写入XML数据
            OutputStream output = servletConnection.getOutputStream();
            System.out.println("发送的报文：");
            System.out.println(sendStr.toString());

            output.write(sendStr.toString().getBytes());
            output.flush();
            output.close();

            // 获取返回的数据
            InputStream inputStream = servletConnection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(inputStream));
            while ((strMessage = reader.readLine()) != null) {
               buffer.append(strMessage);
            }

            System.out.println("接收返回值:" + buffer);

        } catch (java.net.ConnectException e) {
            throw new Exception();
        } finally {
            if (reader != null) {
               reader.close();
            }

        }
     }
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 public class TestTransfers extends HttpServlet {

     private static final long serialVersionUID = 1L;

     protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
     }

     protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        //判断请求报文是否来自代维系统的ip地址
        String ip = request.getRemoteHost();

 // 获取收到的报文
         BufferedReader reader = request.getReader();
          String line = "";
         StringBuffer inputString = new StringBuffer();
         while ((line = reader.readLine()) != null) {
         inputString.append(line);
         }

        //如有必要，可以在报文中增加其他验证和加密的参数
        //解析获取到的报文，根据ip地址、其他验证、加密等等来判断请求报文的服务器是否有权限

        //如果请求验证合格，则根据请求的参数装配返回的报文

        // 要返回的报文
        StringBuffer resultBuffer = new StringBuffer();
        resultBuffer.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        resultBuffer.append("<report_data>");
        resultBuffer.append("<respon_req>953947334</respon_req>");
        resultBuffer.append("<respon_time>20120402113943</respon_time>");
        resultBuffer.append("<result>");
        resultBuffer.append("<id>0000</id>");
        resultBuffer.append("<comment>成功</comment>");
        resultBuffer.append("</result>");
        resultBuffer.append("<items>");
        resultBuffer.append("<item>");
        resultBuffer.append("<county>长治县</county>");
        resultBuffer.append("<company>铁通</company>");
        resultBuffer.append("<speciality>线路</speciality>");
        resultBuffer.append("<personnel>王加和</personnel>");
        resultBuffer.append("<begin_time>20120301000000</begin_time>");
        resultBuffer.append("<end_time>20120331235959</end_time>");
        resultBuffer.append("<plan_quantity>50</plan_quantity>");
        resultBuffer.append("<checkout_quantity>40</checkout_quantity>");
        resultBuffer.append("<patrol_rate>0.80</patrol_rate>");
        resultBuffer.append("</item>");
        //......
        //......
        //......
        //循环组装响应的报文

        resultBuffer.append("</items>");
        resultBuffer.append("</report_data>");

        // 设置发送报文的格式
        response.setContentType("text/xml");
        response.setCharacterEncoding("UTF-8");

        PrintWriter out = response.getWriter();
        out.println(resultBuffer.toString());
        out.flush();
        out.close();
     }
 }