在 Websocket 服务器端点中获取错误 [英] Getting errors in Websocket server Endpoint

问题描述

这是文件，我在 import javax.websocket 行和 @serverEndpoint("/websocket") 中遇到编译错误.为什么不带注释?

This is file and I am getting compilation error in import javax.websocket lines and in @serverEndpoint("/websocket"). Why it is not taking the annotation?

package pack.exp;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/websocket")
public class Hello 
{
{

      private static Set<Session> clients = 
        Collections.synchronizedSet(new HashSet<Session>());

      @OnMessage
      public void onMessage(String message, Session session) 
        throws IOException {

        synchronized(clients){
          // Iterate over the connected sessions
          // and broadcast the received message
          for(Session client : clients){
            if (!client.equals(session)){
              client.getBasicRemote().sendText(message);
            }
          }
        }

      }

      @OnOpen
      public void onOpen (Session session) {
      // Add session to the connected sessions set
        clients.add(session);
      }

      @OnClose
      public void onClose (Session session) {
        // Remove session from the connected sessions set
        clients.remove(session);
      }

    }
}

请帮我解决这个错误.我必须在这段代码中实现一些特定的 api 吗?

Please Help me with this error. Are there some specific api which I have to implement in this code?

推荐答案

缺失的类是 java ee 7 api 的一部分.如果您正在使用 maven 构建您的项目，请查看在以下存储库

The missing classes are part of the java ee 7 api. If you are building your project with maven, take a look at the following repository

http://mvnrepository.com/artifact/javax/javaee-api/7.0

并将此依赖项添加到您的项目中:

and add this dependency to your project:

<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>

如果你没有使用maven，你可以从上面的页面下载jar.http://repo1.maven.org/maven2/javax/javaee-api/7.0/javaee-api-7.0.jar

If you are not using maven, you can download the jar from the page above. http://repo1.maven.org/maven2/javax/javaee-api/7.0/javaee-api-7.0.jar

然后你就有了 API.

Then you have the API.

这篇关于在 Websocket 服务器端点中获取错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！