[英]tomcat 7.0.50 java websocket implementation gives 404 error
I am trying to implement a websocket on tomcat 7.0.50 using annotated endpoints as specified in Java Websocket API (1.0)- JSR 356. Following are the brief steps how I have coded it 1) Write a websocket endpoint using @ServerEndpoint annotation 2) implement @onOpen and @onMessage methods 3) open a websocket using javascript on google chrome. 我正在尝试使用Java Websocket API(1.0) - JSR 356中指定的带注释端点在tomcat 7.0.50上实现websocket。以下是我编写代码的简要步骤1)使用@ServerEndpoint注释编写websocket端点2)实现@onOpen和@onMessage方法3)在谷歌浏览器上使用javascript打开websocket。
Please find code corresponding to above steps in order 请按顺序查找与上述步骤对应的代码
1) STEP 1 & 2 - writing websocket server endpoint: 1)步骤1和2 - 编写websocket服务器端点:
package com.jkweb.websocket;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.websocket.EndpointConfig;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ServerEndpoint(value="/websocket/fileuploadtracker")
@OnOpen
public void open(Session session,EndpointConfig config) {
......
}
@OnMessage
public void onMessage(Session session, String msg) {
try {
session.getBasicRemote().sendText(msg);
} catch (IOException e) {
logger.error(e.getMessage());
}
}
public static void sendMessage(String uniqueTocken,String msg){
try {
Session wsSession = socketConnectionMap.get(uniqueTocken);
wsSession.getBasicRemote().sendText(msg);
} catch (IOException e) {
logger.error(e.getMessage());
}
}
} }
2) STEP 3 - opening websocket using javascript api in chrome: 2)步骤3 - 使用chrome中的javascript api打开websocket:
wsurl = "ws://localhost:8080/jkweb/websocket/fileuploadtracker",
ws;
ws = new WebSocket(wsurl);
ws.onopen = function()
{
// Web Socket is connected, send data using send()
ws.send("Sending first Message");
alert("Message is sent...");
};
ws.onmessage = function (evt)
{
var received_msg = evt.data;
alert("Message is received...");
};
ws.onclose = function(evt)
{
// websocket is closed.
alert("Connection is closed..."+evt.code + ":"+evt.reason );
};
I am using following versions of softwares : 1) Tomcat - 7.0.50 2) Java - 1.7.45 3) Servlet - 3.0 4) Have included following Maven dependency 5) Chrome - 32.0.1700.107m 我正在使用以下版本的软件:1)Tomcat - 7.0.50 2)Java - 1.7.45 3)Servlet - 3.0 4)包括以下Maven依赖5)Chrome - 32.0.1700.107m
<dependency>
<groupId>javax.websocket</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>1.0</version>
<scope>provided</scope>
</dependency>
However I am getting following error and connection is closed with 1066 error code in chrome's console: 但是我收到以下错误,并且在chrome控制台中使用1066错误代码关闭了连接:
WebSocket connection to 'ws://localhost:8080/jkweb/websocket/fileuploadtracker' failed: Error during WebSocket handshake: Unexpected response code: 404
Is there any configuration I am missing out on. 有没有我错过的任何配置。 I tried to search a lot but couldn't find anything.
我试图搜索很多,但找不到任何东西。 Please I need this to be solved ASAP.
我需要尽快解决这个问题。
I have solved it. 我已经解决了。 Problem was very specific to my installation.
问题对我的安装非常具体。 I had the websocket api .jar being installed in my app's WEB-INF/lib directory as well.
我的websocket api .jar也安装在我的应用程序的WEB-INF / lib目录中。 Not sure why it was breaking it.
不知道为什么它会破坏它。 can you put some light on the root cause of this behaviour and why it doesn't work when you gave websocket-api.jar in application's WEB-INF/lib along with tomcat's lib?
你能否解释一下这个行为的根本原因以及当你在应用程序的WEB-INF / lib和tomcat的lib中给出websocket-api.jar时它为什么不起作用?
If you used tomcat server which was created in eclipse, you should delete the old server and create a new one with tomcat 7.0.50. 如果您使用了在eclipse中创建的tomcat服务器,则应该删除旧服务器并使用tomcat 7.0.50创建一个新服务器。 This is my solution.
这是我的解决方案。 PS: My tomcat server is 7.0.53, and the old one is 7.0.21.
PS:我的tomcat服务器是7.0.53,旧的是7.0.21。 Good luck to you~
祝你好运〜
I also had the same problem. 我也有同样的问题。 Try removing the unwanted jars which contains websocket in your $JAVA_HOME/lib folder.
尝试删除$ JAVA_HOME / lib文件夹中包含websocket的不需要的jar。 and then add only
然后只添加
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