Spring 4 WebSocket应用程序 [英] Spring 4 WebSocket app
本文介绍了Spring 4 WebSocket应用程序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我尝试从spring网站运行此示例：教程
除了Spring Boot部分。
I tried to run this example from the spring site: tutorial except the Spring Boot part.
Web.xml
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>sample</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextClass</param-name>
<param-value>
org.springframework.web.context.support.AnnotationConfigWebApplicationContext
</param-value>
</init-param>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>
com.evgeni.websock.WebSocketConfig
</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>sample</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
Java配置：
@Configuration
@ComponentScan(basePackages = {"com.evgeni.controller"})
@EnableWebSocketMessageBroker
@EnableWebMvc
public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketMessageBrokerConfigurer {
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/hello").withSockJS();
}
public void configureClientInboundChannel(ChannelRegistration registration) {
// TODO Auto-generated method stub
}
public void configureClientOutboundChannel(ChannelRegistration registration) {
// TODO Auto-generated method stub
}
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.enableSimpleBroker("/topic");
registry.setApplicationDestinationPrefixes("/app");
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/css/**").addResourceLocations("/css/").setCachePeriod(31556926);
registry.addResourceHandler("/img/**").addResourceLocations("/img/").setCachePeriod(31556926);
registry.addResourceHandler("/js/**").addResourceLocations("/js/").setCachePeriod(31556926);
}
}
控制器：
@Controller
public class GreetingController {
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
Thread.sleep(3000); // simulated delay
System.out.println(message.getName());
return new Greeting("Hello, " + message.getName() + "!");
}
}
index.jsp
index.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<script src="<c:url value='/js/sockjs-0.3.js'/>"></script>
<script src="<c:url value='/js/stomp.js'/>"></script>
<script type="text/javascript">
var stompClient = null;
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
document.getElementById('response').innerHTML = '';
}
function connect() {
var socket = new SockJS("<c:url value='/hello'/>");
stompClient = Stomp.over(socket);
stompClient.connect('', '', function(frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe("<c:url value='/topic/greetings'/>", function(greeting){
showGreeting(JSON.parse(greeting.body).content);
});
});
}
function disconnect() {
stompClient.disconnect();
setConnected(false);
console.log("Disconnected");
}
function sendName() {
var name = document.getElementById('name').value;
stompClient.send("<c:url value='/app/hello'/>", {}, JSON.stringify({ 'name': name }));
}
function showGreeting(message) {
var response = document.getElementById('response');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.appendChild(document.createTextNode(message));
response.appendChild(p);
}
</script>
</head>
<body>
<noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websocket relies on Javascript being enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div>
<div>
<button id="connect" onclick="connect();">Connect</button>
<button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button>
</div>
<div id="conversationDiv">
<label>What is your name?</label><input type="text" id="name" />
<button id="sendName" onclick="sendName();">Send</button>
<p id="response"></p>
</div>
</div>
</body>
</html>
Everithing与教程相同，不同之处在于从web.xml加载的confi和2 -3 c：jsp中的url添加项目的根。
Everithing is the same as the tutorial, except that the conf i loaded from the web.xml and 2-3 c:url in the jsp to add the root of the project.
当我点击连接然后发送时，在浏览器控制台中我得到：
When I click the connect and then send, in the browser console I get:
Opening Web Socket... stomp.js:122
Web Socket Opened... stomp.js:122
>>> CONNECT
login:
passcode:
accept-version:1.1,1.0
heart-beat:10000,10000
stomp.js:122
<<< ERROR
message:Illegal header\c 'login\c'. A header must be of the form <name>\c<value>
content-length:0
stomp.js:122
>>> SEND
destination:/websock/app/hello
content-length:14
{"name":"asd"}
我认为问题出在Sock js的连接函数中
I think that th problm is in the connect function of Sock js
stompClient.connect('', '', function(frame) {...
我正在传递''用于登录和密码。
I'm passing '' for login and passcode.
编辑：
当我将connect函数更改为 stompClient.connect（'random'，'random'，控制台中的响应是：
When I change the connect function to stompClient.connect('random', 'random', the response in the console is:
Opening Web Socket... stomp.js:122
Web Socket Opened... stomp.js:122
>>> CONNECT
login:asd
passcode:asd
accept-version:1.1,1.0
heart-beat:10000,10000
stomp.js:122
<<< CONNECTED
heart-beat:0,0
version:1.1
stomp.js:122
connected to server undefined stomp.js:122
Connected: CONNECTED
version:1.1
heart-beat:0,0
(index):23
>>> SUBSCRIBE
id:sub-0
destination:/websock/topic/greetings
stomp.js:122
>>> SEND
destination:/websock/app/hello
content-length:14
{"name":"asd"}
但消息未传递给控制器。
but the message is not delivered to the controller.
推荐答案
错误是控制器映射错误。
我有：
The mistake was wrong controller mapping. I have:
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception
并在jsp中：
stompClient.subscribe("<c:url value='/topic/greetings'/>", function(greeting){...
和
stompClient.send("<c:url value='/app/hello'/>", {}, JSON.stringify({ 'name': name }));
正确的是：
stompClient.subscribe('/topic/greetings', function(greeting){...
stompClient.send('/app/hello', {}, JSON.stringify({ 'name': name }));
c：url添加项目的根，当我删除它的应用程序工作。但是c：url（根）是在这里创建带有SockJs的新套接字时获得的：
The c:url adds the root of the project, when I removed it the app worked. However c:url(the root) is rquired when create new socket with SockJs here:
var socket = new SockJS("<c:url value='/hello'/>");
这篇关于Spring 4 WebSocket应用程序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！
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