Url Post请求

String urlstring = PropertiesUtil.getValue(PathUtil.getClassPath(),"system.properties", "url"); //获取接口地址;
            PrintWriter out = null;
            BufferedReader in = null;
            try {
                URL url = new URL(urlstring);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                // 设置通用的请求属性
                conn.setRequestProperty("accept", "*/*");
                conn.setRequestProperty("connection", "Keep-Alive");
                conn.setRequestProperty("user-agent",
                        "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
                // 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("datas="+JsonUtil.toJSONString(datas));
                // 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()));
                String line;
                StringBuffer isok = new StringBuffer();
                while ((line = in.readLine()) != null) {  
                    isok.append(line);  
                }
                if(isok.toString().equals("ok")){
                    deleteResource();
                    log.debug("数据传输成功!!!"+new Date());
                }else{
                    log.info("数据接收失败！！！"+new Date());
                }
            } catch (Exception e) {
                log.error("error in bmdInterfaceImpl,and e is " + e.getMessage());
            }//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 e){
                    log.error("error in bmdInterfaceImpl,and e is " + e.getMessage());
                }
            }
        }