public static void main(String[] args) {
        String  remoteFileName="";
        String localFileName="E:\\test.zip";
        HttpClient client = new HttpClient();
        PostMethod get = null;
        FileOutputStream output = null;
        try {
            String url="http://10.39.136.175:18081/acs-app-api/appi/busi/remote/getIcCardsFileByDevid?sign=2d0e3c349dbf29470c1b89dfd895e2ae&timestamp=1538305948";
            get = new PostMethod(url);

            get.setRequestHeader("Content-Type","application/json");
           // get.setRequestHeader("fileName", remoteFileName);
            /*get.addParameter("devIds", "SR-0699010000023");
            get.addParameter("projectCode", "857196");*/
            String str="{\"devIds\":\"SR-0699010000023\",\"projectCode\":\"857196\"}";
            get.setRequestBody(str);
            System.out.println("==============="+str);
            int i = client.executeMethod(get);
            System.out.println("==============="+i);
            //  if (SUCCESS == i) {
            if (200 == i) {

                System.out.println("The response value of token:" + get.getResponseHeader("token"));
                File storeFile = new File(localFileName);
                if(!storeFile.exists()){
                    storeFile.createNewFile();
                }
                output = new FileOutputStream(storeFile);
                IOUtils.copy(get.getResponseBodyAsStream(),output);

                // 得到網路資源的位元組陣列,並寫入檔案
               // output.write(get.getResponseBody());
            } else {
                System.out.println("DownLoad file occurs exception, the error code is :" + i);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (output != null) {
                    output.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            get.releaseConnection();
            client.getHttpConnectionManager().closeIdleConnections(0);
        }