看到spring4的介绍上说已经支持websocket了,尝试了一下之后各种坑,不如servlet简单,写篇文章来讲解一下自己遇到的坑。
环境:tomcat8+spring4.1.6+jdk8+nginx1.8.0
先是看了下网络上的人的实现,千奇百怪,干脆直接在spring的官方文档上观望了一下,看了下他们官方的实现,然而我用的是springmvc,总是失败,报的错误翻译过来大致是找不到请求,所有的页面请求都找不到,找到原因是WebSocketConfig在继承AbstractWebSocketMessageBrokerConfigurer的时候注解上需要加上对springMVC的支持,即@EnableWebMvc,和你在spring配置文件里配置包扫描一个用处。废话不多说,先上代码。
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import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.socket.config.annotation.*;
@Configuration @EnableWebMvc @EnableWebSocketMessageBroker public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker( "/tweet" );
config.setApplicationDestinationPrefixes( "/websocket" );
}
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint( "/hello" ).withSockJS();
}
} |
以上是websocket配置类,下面是请求。
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import com.yuorfei.bean.ResultData;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;
@Controller ( "chat" )
public class ChatAction {
private static final Log log = LogFactory.getLog(MessageAction. class );
@MessageMapping ( "/hello" )
@SendTo ( "/tweet/fuck" )
public ResultData chat(String message) throws Exception {
long time = System.currentTimeMillis();
log.info(time+ ":" +message);
return new ResultData(time, true ,message);
}
} |
请求类准备好了之后写前端代码:
前端代码需要引入的js有sockjs-1.0.3.min.js,stomp.min.js两个,去官网下最新的就行,我目前用的是最新的。
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<! DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" >
< meta http-equiv = "X-UA-Compatible" content = "IE=edge" >
< script src = "/dest/js/fun/chat/sockjs-1.0.3.min.js" ></ script >
< script src = "/dest/js/fun/chat/stomp.min.js" ></ script >
<!-- 为了方便起见,js我就直接这么放这儿了 -->
< script >
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('/hello');
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/tweet/fuck', function(greeting){
showGreeting(JSON.parse(greeting.body).code+" : "+
JSON.parse(greeting.body).message);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendMessage() {
var message = document.getElementById('message').value;
stompClient.send("/websocket/hello", {}, JSON.stringify({ 'message': message }));
}
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 onload = "disconnect()" >
< noscript >
< h2 style = "color: #ff0000" >不支持的浏览器版本,丫的是不是用IE了,你这简直是摧残程序员的生命</ h2 >
</ noscript >
< a href = "${homeUrl!" /"}">< h5 >返回与或非网站首页</ h5 ></ a >
< hr />
< p >这只是一个SpringMVC的websocket例子</ p >
< div >
< div >
< button id = "connect" onclick = "connect();" >连接</ button >
< button id = "disconnect" disabled = "disabled" onclick = "disconnect();" >
断开连接</ button >
</ div >
< div id = "conversationDiv" >
< label >你要说什么</ label >< input type = "text" id = "message" />
< button id = "sendMessage" onclick = "sendMessage();" >发送</ button >
< p id = "response" ></ p >
</ div >
</ div >
< hr />
</ body >
</ html >
|
到了这里就ok了,但是运行却发现会报错,错误信息翻译过来大致意思是:没有引入jackson2的包 或者 socket消息转换没有配置。
猛然一想我的确没有引入jackson2,赶紧maven把jackson2的依赖加进来,很久以前用过jackson,然而不知道2里头只引入core的jar包是不行的,还需要
jackson-databind和jackson-annotations,为了方便我索性全加入进来了(真是够大的,不如fastjson清爽)。
这样就ok了,配置好了之后发送消息,正常接收,处理,ok,控制台不报烦人的错了