// Create a connection to the jabber.org server._
XMPPConnection conn1 = new XMPPTCPConnection("jabber.org");
conn1.connect();
// Create a connection to the jabber.org server on a specific port._
ConnectionConfiguration config = new ConnectionConfiguration("jabber.org", 5222);
XMPPConnection conn2 = new XMPPTCPConnection(config);
conn2.connect();

ConectionConfiguration類提供一些控制操作，譬如是否加密。

Working with the Roster 花名冊

Roster可以讓你保持獲取其他用戶的presence狀態(tài)

用戶可以添加進組“Friend”或者“Co-workers”，你可以知曉用戶是否在線

檢索roster可以通過XMPPConnection.getRoster()方法，roster類允許你查看所有的roster enteries ,群組信息當前的登錄狀態(tài)

Reading and WritingPackets 讀寫數據包

XMPP服務器和客戶端間以XML傳遞的信息被稱為數據包。

org.jivesoftware.smack.packet包內有三種封裝好的基本的packet，分別是message,

presence和IQ。

比如Chat和GroupChat類提供了更高級別的結構用以創(chuàng)建發(fā)送packet，當然你也可以直接用packet。

[java] view plain copy

// Create a new presence. Pass in false to indicate we're unavailable._
Presence presence = new Presence(Presence.Type.unavailable);
presence.setStatus("Gone fishing");
// Send the packet (assume we have a XMPPConnection instance called "con").
con.sendPacket(presence);

Smack提供兩種讀取packets

PacketListener 和PacketCollector
這兩種都通過PacketFilter進行packet加工
A packet listener is used for event style programming, while a packet collector has a result queue of packets that you can do polling and blocking operations on.
（packet listener事件監(jiān)聽，而packet collector是一個packets的可以進行polling和blocking操作的結果集隊列。）
So, a packet listener is useful when you want to take some action whenever a packet happens to come in, while a packet collector is useful when you want to wait for a specific packet to arrive.
（packet listener一旦數據包傳遞抵達的時候你可以進行處理，packet collector則被使用在你需要等待一個指定的packet傳遞抵達時候。）
Packet collectors and listeners can be created using an Connection instance.
（packet listener和packet collector在connection實例中被創(chuàng)建。）

[java] view plain copy

// Create a packet filter to listen for new messages from a particular
// user. We use an AndFilter to combine two other filters._
PacketFilter filter = new AndFilter(new PacketTypeFilter(Message.class),
new FromContainsFilter("mary@jivesoftware.com"));
// Assume we've created a XMPPConnection name "connection".
// First, register a packet collector using the filter we created.
PacketCollector myCollector = connection.createPacketCollector(filter);
// Normally, you'd do something with the collector, like wait for new packets.
// Next, create a packet listener. We use an anonymous inner class for brevity.
PacketListener myListener = new PacketListener() {
public void processPacket(Packet packet) {
// Do something with the incoming packet here._
}
};
// Register the listener._
connection.addPacketListener(myListener, filter);

Managing Connection

Connect and disConnect

[java] view plain copy

// Create the configuration for this new connection_
ConnectionConfiguration config = new ConnectionConfiguration("jabber.org", 5222);
AbstractXMPPConnection connection = new XMPPTCPConnection(config);
// Connect to the server_
connection.connect();
// Log into the server_
connection.login("username", "password", "SomeResource");
...
// Disconnect from the server_
connection.disconnect();

Messaging using Chat

Chat

org.jivesoftware.smack.Chat

[java] view plain copy

// Assume we've created a XMPPConnection name "connection"._
ChatManager chatmanager = connection.getChatManager();
Chat newChat = chatmanager.createChat("jsmith@jivesoftware.com", new MessageListener() {
public void processMessage(Chat chat, Message message) {
System.out.println("Received message: " + message);
}
});
try {
newChat.sendMessage("Howdy!");
}
catch (XMPPException e) {
System.out.println("Error Delivering block");
}
Message newMessage = new Message();
newMessage.setBody("Howdy!");
message.setProperty("favoriteColor", "red");
newChat.sendMessage(newMessage);
// Assume a MessageListener we've setup with a chat._
public void processMessage(Chat chat, Message message) {
// Send back the same text the other user sent us._
chat.sendMessage(message.getBody());
}<span style="color:#ff0000;">
</span>

incoming Chat

[java] view plain copy

_// Assume we've created a XMPPConnection name "connection"._
ChatManager chatmanager = connection.getChatManager().addChatListener(
new ChatManagerListener() {
@Override
public void chatCreated(Chat chat, boolean createdLocally)
{
if (!createdLocally)
chat.addMessageListener(new MyNewMessageListener());;
}
});

Roster and Presence

roster entries

包含xmpp地址，備注名，群組（假如該用戶不屬于任何一組，則調用“unfiled entry”）

[java] view plain copy

Roster roster = connection.getRoster();
Collection<RosterEntry> entries = roster.getEntries();
for (RosterEntry entry : entries) {
System.out.println(entry);
}

監(jiān)聽roster和presence更改

[java] view plain copy

Roster roster = con.getRoster();
roster.addRosterListener(new RosterListener() {
// Ignored events public void entriesAdded(Collection<String> addresses) {}
public void entriesDeleted(Collection<String> addresses) {}
public void entriesUpdated(Collection<String> addresses) {}
public void presenceChanged(Presence presence) {
System.out.println("Presence changed: " + presence.getFrom() + " " + presence);
}
});

Provider architecture

smack provider是用于解析packet extension 和 IQ xml流的

有兩種類型的provider

IQProvider - parses IQ request into java objects

Extension Provider - parses XML sub-documents attached to packets into PacketExtension instances. By default, Smack only knows how to process a few standard packets and sub-packets that are in a few namespaces such as:

(解析packet的xml子元素到PacketExtension實例中。Smack默認僅知道處理少數的標準packets和少數的指定的namespaces下的子packets)

jabber:iq:auth

jabber:iq:roster

jabber:iq:register

（provider這塊翻譯目前就暫且如此，接著會寫IQ擴展將會提到這個，具體看IQ擴展）

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Provider architecture