扩展Smack Message
浏览数：15 /
时间：2015年06月20日
XMPP是一种基于标准通用标记语言的子集XML的协议，它继承了在XML环境中灵活的发展性。
Smack是一个开源的用 java 写的XMPP(jabber)客户端代码库
因为XMPP是XML，所以进行扩展十分方便。而Smack也提供了对Message扩展的支持。
Smack对Message扩展主要需要两个接口
org.jivesoftware.smack.packet.PacketExtension
org.jivesoftware.smack.provider.PacketExtensionProvider
假设我们需要扩展一个消息回执，需要在Message中定义一个Received节点：
package org.jivesoftware.smack.packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.util.StringUtils;
public class Received implements PacketExtension {
public static final String NAME = "received";
public static final String NAME_SPACE = "urn:xmpp:receipts";
private String id = "";
private Integer status = 0;
/**
* @return the id
*/
public String getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(String id) {
this.id = id;
}
/**
* @return the status
*/
public Integer getStatus() {
return status;
}
/**
* @param status the status to set
*/
public void setStatus(Integer status) {
this.status = status;
}
@Override
public String getElementName() {
return "received";
}
@Override
public String getNamespace() {
return "urn:xmpp:receipts";
}
@Override
public String toXML() {
StringBuilder buffer = new StringBuilder();
buffer.append("<received xmlns=\"urn:xmpp:receipts\"");
buffer.append(" id=\"").append(StringUtils.escapeForXML(id)).append("\"");
buffer.append(" status=\"").append(status).append("\"");
buffer.append("/>");
return buffer.toString();
}
}
然后我们需要定义一个Received的解析器
package org.jivesoftware.smack.provider;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.packet.Received;
import org.xmlpull.v1.XmlPullParser;
public class ReceivedProvider implements PacketExtensionProvider {
@Override
public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
boolean done = false;
Received received = new Received();
while (!done) {
int eventType = parser.next();
String name = parser.getName();//XML Tab标签
if (eventType == XmlPullParser.START_TAG) {
if (name.equals("id")) {
received.setId(parser.nextText());
}
if (name.equals("status")) {
received.setStatus(Integer.parseInt(parser.nextText().trim()));
}
}
if (eventType == XmlPullParser.END_TAG) {
if (Received.NAME.equals(name)) {
done = true;
}
}
}
return received;
}
}
我们在使用Smack的时候需要将扩展的Provider添加到ProviderManager
ProviderManager.getInstance().addExtensionProvider(Received.NAME, Received.NAME_SPACE, new ReceivedProvider());
我们想message添加received
Message message = new Message();
message.setTo("to");//目标
message.setFrom("from");//来源
Received received = new Received();
received.setId("CJq74-0");//回执的消息ID
received.setStatus(1);//回执状态
message.addExtension(received);
System.out.println(message.toXML());//查看XML
XML的格式
<message id="CJq74-1" to="to" from="from"><received xmlns="urn:xmpp:receipts" id="CJq74-0" status="1"/></message>
我们可以这样获得received
Received received=(Received)message.getExtension(Received.NAME, Received.NAME_SPACE);
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