使用 spring 4 打开 websocket 连接时出错 [英] Error opening websocket connection using spring 4
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问题描述
我正在尝试使用本教程创建一个 websocket.一切都很好，除了当我尝试打开 websocket 连接时，我的浏览器控制台出现以下错误，并且什么也没有发生.请帮帮我.
错误:
正在打开网络套接字...GET http://localhost:8080/hello/info?t=1445510124841 404(未找到)哎呀！与 http://localhost:8080/hello 的连接丢失TestController.java
package com.test.controller;导入 java.util.Set;导入 javax.servlet.http.HttpServletRequest;导入 javax.servlet.http.HttpServletResponse;导入 org.springframework.beans.factory.annotation.Autowired;导入 org.springframework.messaging.handler.annotation.MessageMapping;导入 org.springframework.messaging.handler.annotation.SendTo;导入 org.springframework.stereotype.Controller;导入 org.springframework.web.bind.annotation.RequestMapping;导入 org.springframework.web.bind.annotation.RequestMethod;导入 org.springframework.web.bind.annotation.ResponseBody;导入 org.springframework.web.servlet.ModelAndView;导入 com.test.dto.EmployeeDTO;导入 com.test.dto.Greeting;导入 com.test.dto.HelloMessage;导入 com.test.service.EmployeeService;@控制器公共类测试控制器{@MessageMapping("/你好")@SendTo("/topic/greetings")公共问候问候(HelloMessage 消息)抛出异常 {线程睡眠(3000)；//模拟延迟System.out.println(message.getName());return new Greeting("Hello, " + message.getName() + "!");}@RequestMapping(value = "/", method = RequestMethod.GET)公共 ModelAndView 主页(HttpServletRequest 请求，HttpServletResponse 响应){返回新的 ModelAndView("test");}}WebSocketConfig.java
package com.test.websocket;导入 org.springframework.context.annotation.Configuration;导入 org.springframework.messaging.simp.config.MessageBrokerRegistry；导入 org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;导入 org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;导入 org.springframework.web.socket.config.annotation.StompEndpointRegistry;@配置@EnableWebSocketMessageBroker公共类 WebSocketConfig 扩展 AbstractWebSocketMessageBrokerConfigurer{@覆盖公共无效 configureMessageBroker(MessageBrokerRegistry 配置){config.enableSimpleBroker("/topic");config.setApplicationDestinationPrefixes("/app");}@覆盖public void registerStompEndpoints(StompEndpointRegistry registry) {//TODO 自动生成的方法存根registry.addEndpoint("/hello").withSockJS();}}测试.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE html><头><title>Hello WebSocket</title><script src="${pageContext.servletContext.contextPath}/js/sockjs-0.3.4.js"></script><script src="${pageContext.servletContext.contextPath}/js/stomp.min.js"></script><script type="text/javascript">var stompClient = null;功能集连接(连接){document.getElementById('connect').disabled = connected;document.getElementById('disconnect').disabled = !connected;document.getElementById('conversationDiv').style.visibility = connected ?'可见':'隐藏'；document.getElementById('response').innerHTML = '';}函数连接(){var socket = new SockJS('${pageContext.servletContext.contextPath}/hello');stompClient = Stomp.over(socket);stompClient.connect({}, function(frame) {设置连接(真)；console.log('已连接:' + 框架);stompClient.subscribe('/topic/greetings', function(greeting){showGreeting(JSON.parse(greeting.body).content);});});}函数断开(){stompClient.disconnect();设置连接(假)；console.log("断开连接");}函数发送名称(){var name = document.getElementById('name').value;stompClient.send('/app/hello', {}, JSON.stringify({ 'name': name }));}功能 showGreeting(message) {var response = document.getElementById('response');var p = document.createElement('p');p.style.wordWrap = '断字';p.appendChild(document.createTextNode(message));response.appendChild(p);}<身体><noscript><h2 style="color: #ff0000">您的浏览器似乎不支持 Javascript！Websocket 依赖于启用的 Javascript.请启用Javascript 并重新加载此页面！</h2></noscript><div><div><button id="connect" onclick="connect();">Connect</button><button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button><div id="conversationDiv"><label>你叫什么名字?</label><input type="text" id="name"/><button id="sendName" onclick="sendName();">发送</button><p id="响应"></p>
</html>
解决方案
问题已解决.我没有在 spring 配置文件中将 WebSocket 配置文件添加到组件扫描包中，因此没有创建用于 websocket 的 bean.
I am trying to create a websocket using this tutorial. Everything is good except that when I try to open websocket connection I get the following error on my browser console and nothing happens at all. Please help me out.
Error:
Opening web socket...
GET http://localhost:8080/hello/info?t=1445510124841 404 (Not Found)
Whoops! Lost connection to http://localhost:8080/hello
TestController.java
package com.test.controller;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.test.dto.EmployeeDTO;
import com.test.dto.Greeting;
import com.test.dto.HelloMessage;
import com.test.service.EmployeeService;
@Controller
public class TestController {
@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() + "!");
}
@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView home(HttpServletRequest request, HttpServletResponse response){
return new ModelAndView("test");
}
}
WebSocketConfig.java
package com.test.websocket;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer{
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
// TODO Auto-generated method stub
registry.addEndpoint("/hello").withSockJS();
}
}
Test.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<script src="${pageContext.servletContext.contextPath}/js/sockjs-0.3.4.js"></script>
<script src="${pageContext.servletContext.contextPath}/js/stomp.min.js"></script>
<script type="text/javascript">
var stompClient = null;
function setConnected(connected) {
document.getElementById('connect').disabled = connected;
document.getElementById('disconnect').disabled = !connected;
document.getElementById('conversationDiv').style.visibility = connected ? 'visible' : 'hidden';
document.getElementById('response').innerHTML = '';
}
function connect() {
var socket = new SockJS('${pageContext.servletContext.contextPath}/hello');
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/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('/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>
解决方案
The issue has been resolved. I had not added the WebSocket configuration file to component scan package in my spring configuration file and hence no bean for websocket was getting created.
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