JDK发送Http请求

最新推荐文章于 2025-06-07 21:51:51 发布

原创最新推荐文章于 2025-06-07 21:51:51 发布 · 2.3k 阅读

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本文介绍了一个使用Java通过HTTP请求检查远程服务器上版本更新的方法。该方法通过POST请求发送客户端版本信息，从服务器获取最新的版本变更，并解析返回的JSON数据来确定是否有新的版本可用。若返回的returnCode为0，则认为获取版本变化成功。

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       HttpURLConnection conn = null;
       InputStream is = null;
       BufferedReader reader = null;
       String msg;
       try {
           String sClientVersion = String.valueOf(clientVersion);
           httpUrl = MessageFormat.format(httpUrl, sClientVersion,Prop.provinceId);
           URL url = new URL(httpUrl);
           conn = (HttpURLConnection) url.openConnection();
           conn.setRequestMethod("POST");
           conn.setRequestProperty("Connection", "close");
           conn.connect();
           int resCode = conn.getResponseCode();
           if (resCode == HttpURLConnection.HTTP_OK) {
               is = conn.getInputStream();
               reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
               StringBuffer sb = new StringBuffer();
               String strRead = null;
               while ((strRead = reader.readLine()) != null) {
                   sb.append(strRead);
               }
               msg = sb.toString();
               JSONObject jobj = JSONObject.fromObject(msg);

               String returnCode = (String) jobj.get("returnCode");
               if ("0".equals(returnCode)) {
                   JSONArray arry = JSONArray.fromObject(jobj.get("object"));
                   List<PromptFile> lis = JSONArray.toList(arry, PromptFile.class);
                   logger.info("获取版本变化成功！ : "+lis);
                   return lis;
               }else{
                   logger.info("获取版本变化失败！ : recutnCode 不等于0 ！");
                   throw new Exception("获取版本变化失败！ : returnCode："+returnCode);
               }
           } else {
               msg = URLDecoder.decode(conn.getResponseMessage(), "UTF-8");
               logger.info("resCode : "+resCode);
               throw new Exception("获取最新版本失败 : responseCode"+resCode+" returnMessage:"+msg);
           }
       } catch (IOException e) {
           throw new Exception("获取版本变化失败，连接业务运营系统失败", e);
       } finally {
           IOUtils.closeQuietly(reader);
           IOUtils.closeQuietly(is);
           if (conn != null) {
               conn.disconnect();
           }
       }