jetty嵌入式启动websocket

网上查了好多资料。试了很多方式都不成功。

记录下成功的方法，我的jetty版本是9.4.9.v20180320：

ContextHandlerCollection contexts = new ContextHandlerCollection();
		// WebSocket启用
		ContextHandler contextHandler = new ContextHandler();
		contextHandler.setContextPath("/ws");
		contextHandler.setHandler(new MyWebSocketHandler());
		contexts.addHandler(contextHandler);
		
		WebAppContext webAppContext = new WebAppContext("WebRoot", "/");
//.....
server.setHandler(contexts);
		try {
			server.start();
			logger.info("Jetty Server 启动成功。" + ConfigUtil.getValue("port"));
			server.join();
		} catch (Exception e) {
			e.printStackTrace();
			logger.error(e.getMessage());
		}

关键点在与contexts.addHandler(contextHandler);要在contexts.addHandler(webAppContext);之前。

即contextHandler要在webAppContext之前。

MyWebSocketListener.java

package com.xpl.startup.websocket;


import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.WebSocketListener;

public class MyWebSocketListener implements WebSocketListener {
	private Session session;
	@Override
	public void onWebSocketConnect(Session session) {
		System.out.println("onWebSocketConnect->"+session.getRemoteAddress());
		this.session = session;
	}
    //发送String
	@Override
	public void onWebSocketText(String message) {
		System.out.println("onWebSocketText");
		if (session.isOpen()) {
			// echo the message back
			session.getRemote().sendString("echo msg->m"+message , null);
		}
	}
    //发送byte[]
	@Override
	public void onWebSocketBinary(byte[] payload, int offset, int len) {
		System.out.println("onWebSocketBinary");
	}

	@Override
	public void onWebSocketError(Throwable cause) {
		System.out.println("Error->" + cause.getMessage());
	}

	@Override
	public void onWebSocketClose(int statusCode, String reason) {
		System.out.println("onWebSocketClose");
		this.session = null;
	}

}

MyWebSocketHandler.java

package com.xpl.startup.websocket;



import org.eclipse.jetty.websocket.server.WebSocketHandler;
import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;

public class MyWebSocketHandler extends WebSocketHandler
{
    @Override
    public void configure(WebSocketServletFactory factory)
    {
        // 设置超时
        factory.getPolicy().setIdleTimeout(10000);

        // 注册
        factory.register(MyWebSocketListener.class);
    }
}

然后启动程序。

客户端访问连接：

<!DOCTYPE HTML>
<html>
   <head>
   <meta charset="utf-8">
   <title>菜鸟教程(runoob.com)</title>
    
      <script type="text/javascript">
         function WebSocketTest()
         {
            if ("WebSocket" in window)
            {
               //alert("您的浏览器支持 WebSocket!");
               
               // 打开一个 web socket
               var ws = new WebSocket("ws://localhost:8080/ws/getsingle/");
                
               ws.onopen = function()
               {
                  // Web Socket 已连接上，使用 send() 方法发送数据
                  ws.send("发送数据");
                  alert("数据发送中...");
               };
                
               ws.onmessage = function (evt) 
               { 
                  var received_msg = evt.data;
                  alert("数据已接收...");
               };
                
               ws.onclose = function()
               { 
                  // 关闭 websocket
                  //alert("连接已关闭..."); 
               };
            }
            
            else
            {
               // 浏览器不支持 WebSocket
               alert("您的浏览器不支持 WebSocket!");
            }
         }
      </script>
        
   </head>
   <body>
   
      <div id="sse">
         <a href="javascript:WebSocketTest()">运行 WebSocket</a>
      </div>
      
   </body>
</html>

jetty嵌入式启动websocket

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