客户端 HttpURLConnection&nb…

HttpURLConnection交互过程中需要服务器端保存session时候需要客户端提交sessionid上来所以，服务器有sessionid下来就要存储起来，每次都要上传上去，服务器端sessionid才不会丢失。

public static String doPost(String reqUrl, String parameters,
            String recvEncoding) {
        System.out.println("request:" + parameters);

        HttpURLConnection url_con = null;
        String responseContent = null;
        if (recvEncoding.isEmpty() || recvEncoding == null) {
            recvEncoding = "utf-8";
        }
        try {
            StringBuffer params = new StringBuffer();

    //中文乱码问题 参数必须进行中文编码 步骤1下面还有一个 
                  params.append("p=" + URLEncoder.encode(parameters, "utf-8"));

                  URL url = new URL(reqUrl); 

                  // **************************** 
                  url_con = (HttpURLConnection) url.openConnection(); 
                  Object objsid = ActionContext.getContext().getSession().get("sid"); 

                  //判断是否有sessionid； 
                  if (objsid != null) { 
                        url_con.setRequestProperty("Cookie", objsid.toString()); 
                  } 

                  url_con.setRequestMethod("POST"); 
                  url_con.setConnectTimeout(500000);// （单位：毫秒）jdk 1.5换成这个,连接超时 
                  url_con.setReadTimeout(500000);// （单位：毫秒）jdk 1.5换成这个,读操作超时 

                  url_con.setDoOutput(true); 

                  byte[] byteParams = params.toString().getBytes();
//这里getBytes也要进行编码，这样才能保证参数能够传到服务器端不是乱码 
                  url_con.getOutputStream().write(parameters.getBytes("utf-8")); 

                  url_con.getOutputStream().flush(); 
                  url_con.getOutputStream().close(); 

                  // System.out.println(url_con.getResponseCode()); 

                  InputStream in = url_con.getInputStream(); 
                  String cookieVal = url_con.getHeaderField("Set-Cookie"); 

                  if (cookieVal != null) { 
                        //存储sessionid； 
                        String sid = cookieVal.substring(0, cookieVal.indexOf(";")); 
                        if (sid != null && !sid.isEmpty()) { 
                              ActionContext.getContext().getSession().put("sid", sid); 
                        } 
                  } 

                  BufferedReader rd = new BufferedReader(new InputStreamReader(in, 
                              recvEncoding)); 
                  String tempLine = rd.readLine(); 
                  StringBuffer tempStr = new StringBuffer(); 
                  String crlf = System.getProperty("line.separator"); 
                  while (tempLine != null) { 
                        tempStr.append(tempLine); 
                        tempStr.append(crlf); 
                        tempLine = rd.readLine(); 
                  } 
                  responseContent = tempStr.toString(); 
                  rd.close(); 
                  in.close(); 
            } catch (IOException e) { 
                  // logger.error("网络故障", e); 
            } finally { 
                  if (url_con != null) { 
                        url_con.disconnect(); 
                  } 
            } 
            System.out.println("Response:"+responseContent); 
            return responseContent; 
      }