websocket与struts2冲突

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需要在一个老项目中使用websocket。
做了一个websocket的小例子，没有问题。
当把这个例子整合到struts2项目里面的时候，就访问不到这个websocket了。是因为struts2的过滤器把所有的请求都拦截了，导致WebSock无法处理来至/websocket的请求。解决办法：在struts的配置文件中使用excludePattern属性过滤掉不处理的url。
websocket需要javaee-api-7.0.jar。struts2的jar包就不在这里列出，大家自行导入。

index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="/js/jquery-1.8.3.min.js"></script>
</head>
<body>
<div>
<input type="submit" value="Start" onclick="start()" />
</div>
<div id="messages"></div>
<script type="text/javascript">
var webSocket = new WebSocket('ws://localhost:80/websocket');

webSocket.onerror = function(event) {
onError(event)
};

webSocket.onopen = function(event) {
onOpen(event)
};

webSocket.onmessage = function(event) {
onMessage(event)
};

function onMessage(event) {
document.getElementById('messages').innerHTML += '<br />'
+ event.data;
}

function onOpen(event) {
document.getElementById('messages').innerHTML = 'Connection established';
}

function onError(event) {
alert(event.data);
}

function start() {
webSocket.send('hello');
return false;
}
</script>
</body>
</html>

WebSocketApp.java
package com.ssh.action;

import java.io.IOException;
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 WebSocketApp {

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

// Print the client message for testing purposes
System.out.println("Received: " + message);

// Send the first message to the client
session.getBasicRemote().sendText("This is the first server message");

// Send 3 messages to the client every 5 seconds
int sentMessages = 0;
while (sentMessages < 3) {
Thread.sleep(5000);
session.getBasicRemote().sendText("This is an intermediate server message. Count: " + sentMessages);
sentMessages++;
}

// Send a final message to the client
session.getBasicRemote().sendText("This is the last server message");
}

@OnOpen
public void onOpen() {
System.out.println("Client connected");
}

@OnClose
public void onClose() {
System.out.println("Connection closed");
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.action.excludePattern" value="/websocket"></constant>
<package name="mypackage" extends="struts-default">
<action name="userAction" class="com.ssh.action.UserAction"
method="save">

</action>
</package>
</struts>

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