两种常见的技术,在这里以超级简化的聊天室概念呈现。
选项#1:让WebSocket将其状态报告回中心位置
@WebSocket
public class ChatSocket {
public Session session;
@OnWebSocketConnect
public void onConnect(Session session) {
this.session = session;
ChatRoom.getInstance().join(this);
}
@OnWebSocketMessage
public void onText(String message) {
ChatRoom.getInstance().writeAllMembers("Hello all");
}
@OnWebSocketClose
public void onClose(int statusCode, String reason) {
ChatRoom.getInstance().part(this);
}
}
public class ChatRoom {
private static final ChatRoom INSTANCE = new ChatRoom();
public static ChatRoom getInstance()
{
return INSTANCE;
}
private List<ChatSocket> members = new ArrayList<>();
public void join(ChatSocket socket)
{
members.add(socket);
}
public void part(ChatSocket socket)
{
members.remove(socket);
}
public void writeAllMembers(String message)
{
for(ChatSocket member: members)
{
member.session.getRemote().sendStringByFuture(message);
}
}
public void writeSpecificMember(String memberName, String message)
{
ChatSocket member = findMemberByName(memberName);
member.session.getRemote().sendStringByFuture(message);
}
public ChatSocket findMemberByName(String memberName)
{
// left as exercise to reader
}
}
然后,只需使用中心位置与您选择的网络袜子交谈即可。
ChatRoom.getInstance().writeSpecificMember("alex", "Hello");
// or
ChatRoom.getInstance().writeAllMembers("Hello all");
选项#2:使用WebSocketCreator手动创建WebSocket
@WebSocket
public class ChatSocket {
public ChatRoom chatroom;
public ChatSocket(ChatRoom chatroom)
{
this.chatroom = chatroom;
}
@OnWebSocketConnect
public void onConnect(Session session) {
chatroom.join(this);
}
@OnWebSocketMessage
public void onText(String message) {
chatroom.writeAllMembers(message);
}
@OnWebSocketClose
public void onClose(int statusCode, String reason) {
chatroom.part(this);
}
}
public class ChatCreator implements WebSocketCreator
{
private ChatRoom chatroom;
public ChatCreator(ChatRoom chatroom)
{
this.chatroom = chatroom;
}
public Object createWebSocket(UpgradeRequest request,
UpgradeResponse response)
{
// We want to create the Chat Socket and associate
// it with our chatroom implementation
return new ChatSocket(chatroom);
}
}
public class ChatHandler extends WebSocketHandler
{
private ChatRoom chatroom = new ChatRoom();
@Override
public void configure(WebSocketServletFactory factory)
{
factory.setCreator(new ChatCreator(chatroom));
}
}
此时,您可以使用与上面相同的技术与您选择的websockets进行通信。