我对服务器发送的事件有疑问。 服务器推送的消息未在客户端收到。我很长时间更改了消息格式，但仍然无法正常工作。我正在使用普通支柱2。支柱需要做任何更改吗？
这是我的Java代码
public final class ClientEventEmitter extends HttpServlet{
private static ConcurrentHashMap<String,ClientEvent> store = new ConcurrentHashMap<String,ClientEvent>();
private static final Logger LOGGER = Logger.getLogger(ClientEventEmitter.class.getName());
private static final int CASE1 = 1;
private static final int CASE2 = 2;
public void doGet(HttpServletRequest request, HttpServletResponse response) {
handler(request,response);
}
public void doPost(HttpServletRequest request ,HttpServletResponse response) {
handler(request,response);
}
private void handler(HttpServletRequest request ,HttpServletResponse response) {
response.setContentType("text/event-stream");
request.setAttribute("org.apache.catalina.ASYNC_SUPPORTED", true);
response.setHeader("Connection", "Keep-Alive");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("X-Accel-Buffering", "no");
response.setCharacterEncoding("UTF-8");
String key = request.getParameter("key");
int type = Integer.parseInt(request.getParameter("connection-type"));
ClientEvent event = null;
switch(type) {
case ClientEventEmitter.CASE1:
event = SampleEvent.getEventInstance(key, request, response);
break;
case ClientEventEmitter.CASE2:
break;
default:
LOGGER.log(Level.SEVERE,"Invalid Connection-type received connection-type={0}",type);
}
if(event!=null) {
LOGGER.log(Level.INFO,"Async Context key={0} event={1}",new Object[] {type,event});
store.put(key, event);
event.sendNotification(key,"test");
}
else {
try {
response.getWriter().write("Exception while creating Connection");
} catch (IOException e) {
LOGGER.log(Level.SEVERE,"Exception while creating async connection ");
}
}
}
}
SampleEvent.Java
public class SampleEvent implements ClientEvent{
private AsyncContext context = null;
private String key = null;
public static final long ASYNC_THREAD_TIMEOUT = 3600000;
public static final String MESSAGE_SEPARATOR = "\n";
private static final long RETRY_TIMEOUT = 3600000;
private static final Logger LOGGER = Logger.getLogger(SampleEvent.class.getName());
private SampleEvent(String key,AsyncContext context) {
this.context = context;
this.key = key;
this.context.setTimeout(SampleEvent.ASYNC_THREAD_TIMEOUT);
this.context.addListener(this.getAsyncListener(this));
this.writeMessage(this.getRetryString(RETRY_TIMEOUT));
}
public void closeClient() {
this.writeMessage(this.getEvent("closed"));
this.context.complete();
ClientEventEmitter.removeEvent(this.key);
}
private void writeMessage(String message) {
PrintWriter out =null;
LOGGER.log(Level.INFO,"Writing Message to Server Send Event Stream {0}",message);
try {
out = this.context.getResponse().getWriter();
out.write(message);
out.write(MESSAGE_SEPARATOR);
out.flush();
} catch (IOException e) {
LOGGER.log(Level.SEVERE,"Exception while writing message in Event Streams ",e);
}
}
public void sendNotification(String message) {
this.writeMessage(this.formatMessage(message));
}
public static ClientEvent getEventInstance(String key,HttpServletRequest request,HttpServletResponse response) {
return new SampleEvent(key,request.startAsync());
}
}
default String formatMessage(String msg) {
return "data: " + msg +"\n";
}