JAVA中,有一个开源软件,JavaPNS实现了Java平台中连接苹果服务器与推送消息的服务。但是在使用的过程中,有两点需要使用者注意一下,希望后续使用的同志们能避免我走过的覆辙。
1、一是向苹果的服务推送消息时,如果遇到无效的deviceToken,苹果会断开网络连接,而JavaPNS不会进行重连。苹果原文:
If you send a notification and APNs finds the notification malformed or otherwise unintelligible, it returns an error-response packet prior to disconnecting. (If there is no error, APNs doesn’t return anything.) Figure 5-3 depicts the format of the error-response packet.
2、JavaPNS是一条条发送通知的,但是对于大规模发送的生产环境,显然是不可以的,建议使用批量发送。苹果原文:
The binary interface employs a plain TCP socket for binary content that is streaming in nature. For optimum performance, you should batch multiple notifications in a single transmission over the interface, either explicitly or using a TCP/IP Nagle algorithm.
对于此,我对JavaAPNS的代码进行了改动,使其支持批量发送和苹果断开重连,但是有一个问题需要大家注意一下,在正常发送的情况下,苹果是不会向Socket中写任何数据的,需要等待其读超时,this.socket.getInputStream().read(),确订推送结果的正常。通过持续的向Socket中写数据,实现批量发送,调用flush方法时,完成一次批量发送。在PushNotificationManager增加如下方法:
public ListsendNotification(List pnl) { logger.info(psn + "RR批量推送时消息体的大小为:" + pnl.size()); List failList = new ArrayList (); if (pnl.size() == 0) { return failList; } Set sendSet = new HashSet (); int counter = 0; while (counter < pnl.size()) { try { this.socket.setSoTimeout(3000); this.socket.setSendBufferSize(25600); this.socket.setReceiveBufferSize(600); for (; counter < pnl.size(); counter++) { PushedNotification push = pnl.get(counter); if (sendSet.contains(push.getIdentifier())) { logger.warn("信息[" + push.getIdentifier() + "]已经被推送"); continue; } byte[] bytes = getMessage(push.getDevice().getToken(), push.getPayload(), push.getIdentifier(), push); this.socket.getOutputStream().write(bytes); // 考虑到重发的问题 // sendSet.add(push.getIdentifier()); } this.socket.getOutputStream().flush(); // 等待回馈数据,比单个发送时延时长一点,否则将无法获取到回馈数据 this.socket.setSoTimeout(1000); StringBuffer allResult = new StringBuffer(); ResponsePacket rp = new ResponsePacket(); int readCounter = 0; // 处理读回写数据的异常 try { logger.info(psn + "检查流数据是否可用:" + this.socket.getInputStream().available()); byte[] sid = new byte[4];// 发送标记 while (true) { int value = this.socket.getInputStream().read(); if (value < 0) { break; } readCounter++; if (readCounter == 1) { rp.setCommand(value); } if (readCounter == 2) { rp.setStatus(value); } if (readCounter >= 3 && readCounter <= 6) { sid[readCounter - 3] = (byte) value; if (readCounter == 6) { rp.setIdentifier(ByteBuffer.wrap(sid).getInt()); if (failList.contains(rp)) { logger.error("错误返馈数据中已经包含当前数据," + rp.getIdentifier()); } failList.add(rp); } } allResult.append(value + "_"); } this.socket.getInputStream().close(); } catch (SocketTimeoutException ste) { logger.debug(psn + "消息推送成功,无任何返回!", ste); } catch (IOException e) { logger.debug(psn + "消息推送成功,关闭连接流时出错!", e); } logger.info("苹果返回的数据为:" + allResult.toString()); if (readCounter >= 6) { // 找到出错的地方 for (int i = 0; i < pnl.size(); i++) { PushedNotification push = pnl.get(i); if (push.getIdentifier() == rp.getIdentifier()) { counter = i + 1; break; // 从出错的地方再次发送, } } try { this.createNewSocket(); } catch (Exception e) { logger.warn("连接时出错,", e); } } } catch (SSLHandshakeException she) { // 握手出错,标记不加 logger.warn("SHE消息推送时出错,", she); try { this.createNewSocket(); } catch (Exception e) { logger.warn("连接时出错,", e); } } catch (SocketException se) { logger.warn("SE消息推送时出错", se); counter++; try { this.createNewSocket(); } catch (Exception e) { logger.warn("连接时出错,", e); } } catch (IOException e) { logger.warn("IE消息推送时出错", e); counter++; } catch (Exception e) { logger.warn("E消息推送时出错", e); counter++; } if (counter >= pnl.size()) { break; } } return failList; }