openfire本身有很多比较好的实现框架,如asmack和smack。具体的大家可以上网搜索。因为openfire本身对长连接的支持不是很好,而且相对来说,长连接也挺消耗资源的,但是,又要必须做到及时响应。
这就存在了一些特殊的账户要存在在服务器中。这些账户能实现自动添加好友,自动响应消息和消息回执响应,而消息回执的响应和请求在smack端有很好的封装,而我服务端也按照其xml请求和响应,如下:
PacketExtension packetExtension2 = new PacketExtension(DeliveryReceipt.ELEMENT,DeliveryReceipt.NAMESPACE); // 将消息id返回给发送信息用户 表明已经接收到 packetExtension2.getElement().addAttribute("id", message.getID()); // 回执请求设置 responseMessage.addExtension(packetExtension2); XMPPServer.getInstance().getRoutingTable().routePacket(message.getFrom(), responseMessage, true);
而消息回执的响应相对来说复杂一点,如下:
private static Message packMessageProperty(Message requestMessage , Map<String, String> propertyValue){ String key = null; String value = null; for (Map.Entry<String, String> entry: propertyValue.entrySet()) { key = entry.getKey(); value = entry.getValue(); } Message sendMessage = new Message(); sendMessage.setFrom(requestMessage.getTo()); sendMessage.setTo(requestMessage.getFrom()); sendMessage.setType(org.xmpp.packet.Message.Type.chat); // 封装property数据 PacketExtension packetExtension = new PacketExtension("properties","http://www.jivesoftware.com/xmlns/xmpp/properties"); Element root = packetExtension.getElement(); Element propertyElement = root.addElement("property"); Element nameElement = propertyElement.addElement("name"); Element valueElement = propertyElement.addElement("value"); nameElement.setText(key); valueElement.addAttribute("type", "string"); valueElement.setText(value); sendMessage.addExtension(packetExtension); return sendMessage; }
设置消息回执主要原因有以下几条:
1.查看消息是否发送成功,方便再次发送
2.统计openfire消息的送达率
3.弥补openfire丢包的风险等