WebSocket消息不是从Jetty服务器发送的

时间:2014-04-02 17:03:33

标签: java websocket jetty-9

民间!

我正在使用WebSocket实现聊天Web应用程序,但是,当在Jetty 9.1.3.v20140225上运行时,在建立连接之后,从服务器端发送的一些消息不会在客户端上被接收侧。奇怪的是,这种不良行为发生在一些消息上,但其他消息都没问题(最后请参阅我的PS)。

我已经尝试过使用Chrome 33(我知道使用的是通用扩展扩展)和FireFox 28(不会这样做)和类似的结果。事实上,Chrome会收到一些消息,但FireFox不会收到任何消息。

当应用程序在TomCat 7.0.47上运行时它运行正常,所以我怀疑问题出在Jetty ......

故事告诉我们看看我的最小应用程序的代码,它可以重现问题:

首先,有一个简单的页面,您可以通过点击相应的按钮来连接,发送消息(并接收响应),并断开WebSocket。

hello.html的:

<html>
<head>
<meta charset="ISO-8859-1">
<title>Minimum - WebSocket Sandbox</title>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
    $(document).ready(function() {
        $("#connect").click(function() {
            connect();
        });
        $("#send").click(function() {
            send("John Doe");
        });
        $("#disconnect").click(function() {
            disconnect();
        });
    });
</script>
<script>
    var wsocket;

    function connect() {
        var base = getAppLocation("ws:");
        wsocket = new WebSocket(base + "/hello");
        wsocket.onmessage = function(e) {
            log("<<< " + e.data);
        };
        wsocket.onopen = function() {
            log("Connection opened.");
        };
        wsocket.onclose = function(e) {
            log("Connection closed.  Reason: (" + e.code + ") " + e.reason);
        };
        wsocket.onerror = function(e) {
            log("Error!");
        };
    }

    function disconnect() {
        wsocket.close(1000, "Closed by user.");
        wsocket = null;
    }

    function send(msg) {
        if ( !wsocket || wsocket.readyState != WebSocket.OPEN ) {
            log("Not connected.");
            return;
        }
        wsocket.send(msg);
        log(">>> " + msg);
    }

    function log(msg) {
        $("#output").append(msg + "<br/>");
    }

    /**
     * This just ajust WebSocket URL ocording to the server serving the page.
     */
    function getAppLocation(proto) {
        if ( !proto ) {
            proto = window.location.protocol;
        }
        else if ( proto == "ws:" && window.location.protocol == "https:" ) {
            proto = "wss:";
        }
        var host = window.location.host;
        var path = window.location.pathname.split('/')[1];
        var base = proto + "//" + host + "/" + path;
        return base;
    }
</script>
</head>
<body>
  <div>
    <button id="connect">Connect</button>
    <button id="send">Send</button>
    <button id="disconnect">Disconnect</button>
  </div>
  <div id="output"></div>
</body>
</html>

在服务器端,有一个端点在连接打开后立即向客户端发送消息(注释掉的行显示Chrome客户端收到的示例消息)。它还回应从客户端收到的消息。

HelloEndPoint:

package com.ciandt.helenov.sandbox.websocket.min;

import java.io.IOException;

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

@ServerEndpoint("/hello")
public class HelloEndpoint {

    @OnOpen
    public void onOpen ( Session session, EndpointConfig conf ) {
        try {
            // this is not received in the client
            session.getBasicRemote().sendText( "o" );

            // this is (but only if client is a Chrome)
            // session.getBasicRemote().sendText( "a[\"100\"]" );
        }
        catch ( IOException e ) {
            e.printStackTrace();
        }
    }

    @OnMessage
    public void onMessage ( Session session, String msg ) {
        try {
            session.getBasicRemote().sendText( "Hello, " + msg + "!" );
        }
        catch ( IOException e ) {
            e.printStackTrace();
        }
    }
}

最后,这个pom.xml打包并运行Web应用程序。我通过Eclipse中的嵌入式maven插件运行Jetty(问题出现的地方)和TomCat(运行正常)

的pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="
             http://maven.apache.org/POM/4.0.0 
             http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <name>WebSocket Mininum</name>
  <description>WebSocket Minimum Web Application</description>
  <groupId>com.ciandt.helenov.sandbox</groupId>
  <artifactId>ws-min</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.7</java.version>
    <slf4j.version>1.7.2</slf4j.version>
    <logback.version>1.0.13</logback.version>
    <jetty.version>9.1.3.v20140225</jetty.version>
    <tomcat.version>7.0.47</tomcat.version>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <compilerVersion>${java.version}</compilerVersion>
          <source>${java.version}</source>
          <target>${java.version}</target>
          <encoding>${project.build.sourceEncoding}</encoding>
          <compilerArgument>-proc:none</compilerArgument>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.4</version>
        <configuration>
          <attachClasses>true</attachClasses>
        </configuration>
      </plugin>
      <!-- Support to use Eclipse -->
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-eclipse-plugin</artifactId>
          <version>2.7</version>
          <configuration>
              <downloadSources>true</downloadSources>
              <downloadJavadocs>true</downloadJavadocs>
              <wtpversion>2.0</wtpversion>
          </configuration>
      </plugin>
      <!-- Support to run Jetty on Eclipse -->
      <plugin>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>${jetty.version}</version>
        <configuration>
          <webAppConfig>
            <contextPath>/${project.artifactId}</contextPath>
          </webAppConfig>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
        <configuration>
          <port>9090</port>
          <path>/${project.artifactId}</path>
          <systemProperties>
            <appserver.base>${project.build.directory}/tomcat-base</appserver.base>
            <appserver.home>${project.build.directory}/tomcat-home</appserver.home>
            <derby.system.home>${project.build.directory}/tomcat-base/logs</derby.system.home>
            <java.io.tmpdir>${project.build.directory}</java.io.tmpdir>
          </systemProperties>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>javax.websocket</groupId>
      <artifactId>javax.websocket-api</artifactId>
      <version>1.0</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

</project>

这就是全部!

在Jetty上运行应用程序时(通过调用mvn jetty:run),我要求连接WebSocket(通过单击页面上的“连接”按钮),端点中的onOpen()方法运行并将消息发送回客户端但是因为我预计会显示它,所以没有收到。在TomCat上运行相同的应用程序时(通过调用mvn tomcat7:run),它运行良好。

有人有过类似的问题吗?任何人都知道发生了什么?可以是Jetty服务器上的错误吗?

TIA和问候!

Heleno的


PS:我打算在我的应用程序中使用Spring和SockJS,但SockJS在服务器上发送&#34; open frame&#34; (只是一个&#34; o&#34;)刚刚打开连接后,但由于没有收到它,它会回退放弃WebSocket连接并转向XHR Streaming。这就是我想要避免的。但是,由于我设法在没有Spring和SockJS的情况下重现问题(如所提供的代码中所示),我已经解除了他们对此问题的任何参与。

0 个答案:

没有答案